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/* Copyright (C) 2000-2006 MySQL AB & Sasha
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <drizzled/server_includes.h>
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#include "log_event.h"
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#include "rpl_filter.h"
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#include <drizzled/drizzled_error_messages.h>
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int max_binlog_dump_events = 0; // unlimited
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fake_rotate_event() builds a fake (=which does not exist physically in any
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binlog) Rotate event, which contains the name of the binlog we are going to
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send to the slave (because the slave may not know it if it just asked for
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MASTER_LOG_FILE='', MASTER_LOG_POS=4).
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< 4.0.14, fake_rotate_event() was called only if the requested pos was 4.
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After this version we always call it, so that a 3.23.58 slave can rely on
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it to detect if the master is 4.0 (and stop) (the _fake_ Rotate event has
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zeros in the good positions which, by chance, make it possible for the 3.23
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slave to detect that this event is unexpected) (this is luck which happens
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because the master and slave disagree on the size of the header of
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Relying on the event length of the Rotate event instead of these
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well-placed zeros was not possible as Rotate events have a variable-length
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static int fake_rotate_event(NET* net, String* packet, char* log_file_name,
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uint64_t position, const char** errmsg)
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char header[LOG_EVENT_HEADER_LEN], buf[ROTATE_HEADER_LEN+100];
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'when' (the timestamp) is set to 0 so that slave could distinguish between
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real and fake Rotate events (if necessary)
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header[EVENT_TYPE_OFFSET] = ROTATE_EVENT;
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char* p = log_file_name+dirname_length(log_file_name);
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uint32_t ident_len = (uint32_t) strlen(p);
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uint32_t event_len = ident_len + LOG_EVENT_HEADER_LEN + ROTATE_HEADER_LEN;
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int4store(header + SERVER_ID_OFFSET, server_id);
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int4store(header + EVENT_LEN_OFFSET, event_len);
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int2store(header + FLAGS_OFFSET, 0);
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// TODO: check what problems this may cause and fix them
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int4store(header + LOG_POS_OFFSET, 0);
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packet->append(header, sizeof(header));
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int8store(buf+R_POS_OFFSET,position);
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packet->append(buf, ROTATE_HEADER_LEN);
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packet->append(p,ident_len);
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if (my_net_write(net, (unsigned char*) packet->ptr(), packet->length()))
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*errmsg = "failed on my_net_write()";
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static int send_file(THD *thd)
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int fd = -1, error = 1;
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char fname[FN_REFLEN+1];
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const char *errmsg = 0;
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unsigned long packet_len;
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unsigned char buf[IO_SIZE]; // It's safe to alloc this
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The client might be slow loading the data, give him wait_timeout to do
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old_timeout= net->read_timeout;
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my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
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We need net_flush here because the client will not know it needs to send
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us the file name until it has processed the load event entry
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if (net_flush(net) || (packet_len = my_net_read(net)) == packet_error)
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errmsg = _("Failed in send_file() while reading file name");
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// terminate with \0 for fn_format
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*((char*)net->read_pos + packet_len) = 0;
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fn_format(fname, (char*) net->read_pos + 1, "", "", 4);
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// this is needed to make replicate-ignore-db
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if (!strcmp(fname,"/dev/null"))
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if ((fd = my_open(fname, O_RDONLY, MYF(0))) < 0)
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errmsg = _("Failed in send_file() on open of file");
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while ((long) (bytes= my_read(fd, buf, IO_SIZE, MYF(0))) > 0)
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if (my_net_write(net, buf, bytes))
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errmsg = _("Failed in send_file() while writing data to client");
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if (my_net_write(net, (unsigned char*) "", 0) || net_flush(net) ||
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(my_net_read(net) == packet_error))
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errmsg = _("Failed in send_file() while negotiating file transfer close");
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my_net_set_read_timeout(net, old_timeout);
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(void) my_close(fd, MYF(0));
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sql_print_error("%s",errmsg);
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Adjust the position pointer in the binary log file for all running slaves
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adjust_linfo_offsets()
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purge_offset Number of bytes removed from start of log index file
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- This is called when doing a PURGE when we delete lines from the
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- Before calling this function, we have to ensure that no threads are
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using any binary log file before purge_offset.a
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- Inform the slave threads that they should sync the position
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in the binary log file with flush_relay_log_info.
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Now they sync is done for next read.
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void adjust_linfo_offsets(my_off_t purge_offset)
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pthread_mutex_lock(&LOCK_thread_count);
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I_List_iterator<THD> it(threads);
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if ((linfo = tmp->current_linfo))
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pthread_mutex_lock(&linfo->lock);
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Index file offset can be less that purge offset only if
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we just started reading the index file. In that case
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we have nothing to adjust
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if (linfo->index_file_offset < purge_offset)
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linfo->fatal = (linfo->index_file_offset != 0);
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linfo->index_file_offset -= purge_offset;
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pthread_mutex_unlock(&linfo->lock);
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pthread_mutex_unlock(&LOCK_thread_count);
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bool log_in_use(const char* log_name)
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int log_name_len = strlen(log_name) + 1;
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pthread_mutex_lock(&LOCK_thread_count);
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I_List_iterator<THD> it(threads);
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if ((linfo = tmp->current_linfo))
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pthread_mutex_lock(&linfo->lock);
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result = !memcmp(log_name, linfo->log_file_name, log_name_len);
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pthread_mutex_unlock(&linfo->lock);
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pthread_mutex_unlock(&LOCK_thread_count);
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bool purge_error_message(THD* thd, int res)
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case LOG_INFO_EOF: errmsg= ER_UNKNOWN_TARGET_BINLOG; break;
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case LOG_INFO_IO: errmsg= ER_IO_ERR_LOG_INDEX_READ; break;
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case LOG_INFO_INVALID:errmsg= ER_BINLOG_PURGE_PROHIBITED; break;
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case LOG_INFO_SEEK: errmsg= ER_FSEEK_FAIL; break;
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case LOG_INFO_MEM: errmsg= ER_OUT_OF_RESOURCES; break;
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case LOG_INFO_FATAL: errmsg= ER_BINLOG_PURGE_FATAL_ERR; break;
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case LOG_INFO_IN_USE: errmsg= ER_LOG_IN_USE; break;
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case LOG_INFO_EMFILE: errmsg= ER_BINLOG_PURGE_EMFILE; break;
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default: errmsg= ER_LOG_PURGE_UNKNOWN_ERR; break;
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my_message(errmsg, ER(errmsg), MYF(0));
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bool purge_master_logs(THD* thd, const char* to_log)
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char search_file_name[FN_REFLEN];
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if (!mysql_bin_log.is_open())
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mysql_bin_log.make_log_name(search_file_name, to_log);
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return purge_error_message(thd,
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mysql_bin_log.purge_logs(search_file_name, 0, 1,
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bool purge_master_logs_before_date(THD* thd, time_t purge_time)
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if (!mysql_bin_log.is_open())
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return purge_error_message(thd,
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mysql_bin_log.purge_logs_before_date(purge_time));
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int test_for_non_eof_log_read_errors(int error, const char **errmsg)
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if (error == LOG_READ_EOF)
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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*errmsg = "bogus data in log event";
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case LOG_READ_TOO_LARGE:
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*errmsg = "log event entry exceeded max_allowed_packet; \
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Increase max_allowed_packet on master";
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*errmsg = "I/O error reading log event";
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*errmsg = "memory allocation failed reading log event";
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*errmsg = "binlog truncated in the middle of event";
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*errmsg = "unknown error reading log event on the master";
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An auxiliary function for calling in mysql_binlog_send
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to initialize the heartbeat timeout in waiting for a binlogged event.
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@param[in] thd THD to access a user variable
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@return heartbeat period an uint64_t of nanoseconds
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or zero if heartbeat was not demanded by slave
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static uint64_t get_heartbeat_period(THD * thd)
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LEX_STRING name= { C_STRING_WITH_LEN("master_heartbeat_period")};
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user_var_entry *entry=
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(user_var_entry*) hash_search(&thd->user_vars, (unsigned char*) name.str,
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return entry? entry->val_int(&null_value) : 0;
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Function prepares and sends repliation heartbeat event.
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@param net net object of THD
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@param packet buffer to store the heartbeat instance
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@param event_coordinates binlog file name and position of the last
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real event master sent from binlog
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Among three essential pieces of heartbeat data Log_event::when
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The error to send is serious and should force terminating
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static int send_heartbeat_event(NET* net, String* packet,
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const struct event_coordinates *coord)
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char header[LOG_EVENT_HEADER_LEN];
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'when' (the timestamp) is set to 0 so that slave could distinguish between
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real and fake Rotate events (if necessary)
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memset(header, 0, 4); // when
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header[EVENT_TYPE_OFFSET] = HEARTBEAT_LOG_EVENT;
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char* p= coord->file_name + dirname_length(coord->file_name);
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uint32_t ident_len = strlen(p);
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uint32_t event_len = ident_len + LOG_EVENT_HEADER_LEN;
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int4store(header + SERVER_ID_OFFSET, server_id);
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int4store(header + EVENT_LEN_OFFSET, event_len);
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int2store(header + FLAGS_OFFSET, 0);
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int4store(header + LOG_POS_OFFSET, coord->pos); // log_pos
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packet->append(header, sizeof(header));
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packet->append(p, ident_len); // log_file_name
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if (my_net_write(net, (unsigned char*) packet->ptr(), packet->length()) ||
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packet->set("\0", 1, &my_charset_bin);
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TODO: Clean up loop to only have one call to send_file()
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void mysql_binlog_send(THD* thd, char* log_ident, my_off_t pos,
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char *log_file_name = linfo.log_file_name;
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char search_file_name[FN_REFLEN], *name;
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String* packet = &thd->packet;
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const char *errmsg = "Unknown error";
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NET* net = &thd->net;
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pthread_mutex_t *log_lock;
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bool binlog_can_be_corrupted= false;
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memset(&log, 0, sizeof(log));
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heartbeat_period from @master_heartbeat_period user variable
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uint64_t heartbeat_period= get_heartbeat_period(thd);
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struct timespec heartbeat_buf;
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struct event_coordinates coord_buf;
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struct timespec *heartbeat_ts= NULL;
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struct event_coordinates *coord= NULL;
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if (heartbeat_period != 0L)
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heartbeat_ts= &heartbeat_buf;
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set_timespec_nsec(*heartbeat_ts, 0);
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coord->file_name= log_file_name; // initialization basing on what slave remembers
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if (!mysql_bin_log.is_open())
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errmsg = "Binary log is not open";
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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if (!server_id_supplied)
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errmsg = "Misconfigured master - server id was not set";
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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name=search_file_name;
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mysql_bin_log.make_log_name(search_file_name, log_ident);
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name=0; // Find first log
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linfo.index_file_offset = 0;
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if (mysql_bin_log.find_log_pos(&linfo, name, 1))
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errmsg = "Could not find first log file name in binary log index file";
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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pthread_mutex_lock(&LOCK_thread_count);
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thd->current_linfo = &linfo;
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pthread_mutex_unlock(&LOCK_thread_count);
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if ((file=open_binlog(&log, log_file_name, &errmsg)) < 0)
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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if (pos < BIN_LOG_HEADER_SIZE || pos > my_b_filelength(&log))
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errmsg= "Client requested master to start replication from \
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impossible position";
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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We need to start a packet with something other than 255
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to distinguish it from error
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packet->set("\0", 1, &my_charset_bin); /* This is the start of a new packet */
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Tell the client about the log name with a fake Rotate event;
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this is needed even if we also send a Format_description_log_event
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just after, because that event does not contain the binlog's name.
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Note that as this Rotate event is sent before
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Format_description_log_event, the slave cannot have any info to
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understand this event's format, so the header len of
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Rotate_log_event is FROZEN (so in 5.0 it will have a header shorter
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than other events except FORMAT_DESCRIPTION_EVENT).
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Before 4.0.14 we called fake_rotate_event below only if (pos ==
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BIN_LOG_HEADER_SIZE), because if this is false then the slave
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already knows the binlog's name.
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Since, we always call fake_rotate_event; if the slave already knew
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the log's name (ex: CHANGE MASTER TO MASTER_LOG_FILE=...) this is
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useless but does not harm much. It is nice for 3.23 (>=.58) slaves
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which test Rotate events to see if the master is 4.0 (then they
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choose to stop because they can't replicate 4.0); by always calling
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fake_rotate_event we are sure that 3.23.58 and newer will detect the
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problem as soon as replication starts (BUG#198).
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Always calling fake_rotate_event makes sending of normal
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(=from-binlog) Rotate events a priori unneeded, but it is not so
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simple: the 2 Rotate events are not equivalent, the normal one is
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before the Stop event, the fake one is after. If we don't send the
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normal one, then the Stop event will be interpreted (by existing 4.0
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slaves) as "the master stopped", which is wrong. So for safety,
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given that we want minimum modification of 4.0, we send the normal
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if (fake_rotate_event(net, packet, log_file_name, pos, &errmsg))
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This error code is not perfect, as fake_rotate_event() does not
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read anything from the binlog; if it fails it's because of an
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error in my_net_write(), fortunately it will say so in errmsg.
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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packet->set("\0", 1, &my_charset_bin);
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Adding MAX_LOG_EVENT_HEADER_LEN, since a binlog event can become
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this larger than the corresponding packet (query) sent
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from client to master.
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thd->variables.max_allowed_packet+= MAX_LOG_EVENT_HEADER;
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We can set log_lock now, it does not move (it's a member of
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mysql_bin_log, and it's already inited, and it will be destroyed
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log_lock = mysql_bin_log.get_log_lock();
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if (pos > BIN_LOG_HEADER_SIZE)
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Try to find a Format_description_log_event at the beginning of
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if (!(error = Log_event::read_log_event(&log, packet, log_lock)))
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The packet has offsets equal to the normal offsets in a binlog
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event +1 (the first character is \0).
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if ((*packet)[EVENT_TYPE_OFFSET+1] == FORMAT_DESCRIPTION_EVENT)
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binlog_can_be_corrupted= test((*packet)[FLAGS_OFFSET+1] &
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LOG_EVENT_BINLOG_IN_USE_F);
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(*packet)[FLAGS_OFFSET+1] &= ~LOG_EVENT_BINLOG_IN_USE_F;
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mark that this event with "log_pos=0", so the slave
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should not increment master's binlog position
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(rli->group_master_log_pos)
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int4store((char*) packet->ptr()+LOG_POS_OFFSET+1, 0);
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if reconnect master sends FD event with `created' as 0
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to avoid destroying temp tables.
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int4store((char*) packet->ptr()+LOG_EVENT_MINIMAL_HEADER_LEN+
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ST_CREATED_OFFSET+1, (uint32_t) 0);
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if (my_net_write(net, (unsigned char*) packet->ptr(), packet->length()))
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errmsg = "Failed on my_net_write()";
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my_errno= ER_UNKNOWN_ERROR;
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No need to save this event. We are only doing simple reads
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(no real parsing of the events) so we don't need it. And so
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we don't need the artificial Format_description_log_event of
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if (test_for_non_eof_log_read_errors(error, &errmsg))
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It's EOF, nothing to do, go on reading next events, the
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Format_description_log_event will be found naturally if it is written.
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/* reset the packet as we wrote to it in any case */
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packet->set("\0", 1, &my_charset_bin);
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} /* end of if (pos > BIN_LOG_HEADER_SIZE); */
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/* The Format_description_log_event event will be found naturally. */
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/* seek to the requested position, to start the requested dump */
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my_b_seek(&log, pos); // Seek will done on next read
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while (!net->error && net->vio != 0 && !thd->killed)
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while (!(error = Log_event::read_log_event(&log, packet, log_lock)))
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log's filename does not change while it's active
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coord->pos= uint4korr(packet->ptr() + 1 + LOG_POS_OFFSET);
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if ((*packet)[EVENT_TYPE_OFFSET+1] == FORMAT_DESCRIPTION_EVENT)
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binlog_can_be_corrupted= test((*packet)[FLAGS_OFFSET+1] &
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LOG_EVENT_BINLOG_IN_USE_F);
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(*packet)[FLAGS_OFFSET+1] &= ~LOG_EVENT_BINLOG_IN_USE_F;
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else if ((*packet)[EVENT_TYPE_OFFSET+1] == STOP_EVENT)
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binlog_can_be_corrupted= false;
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if (my_net_write(net, (unsigned char*) packet->ptr(), packet->length()))
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errmsg = "Failed on my_net_write()";
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my_errno= ER_UNKNOWN_ERROR;
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if ((*packet)[LOG_EVENT_OFFSET+1] == LOAD_EVENT)
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errmsg = "failed in send_file()";
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my_errno= ER_UNKNOWN_ERROR;
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packet->set("\0", 1, &my_charset_bin);
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here we were reading binlog that was not closed properly (as a result
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of a crash ?). treat any corruption as EOF
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if (binlog_can_be_corrupted && error != LOG_READ_MEM)
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TODO: now that we are logging the offset, check to make sure
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the recorded offset and the actual match.
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Guilhem 2003-06: this is not true if this master is a slave
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<4.0.15 running with --log-slave-updates, because then log_pos may
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be the offset in the-master-of-this-master's binlog.
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if (test_for_non_eof_log_read_errors(error, &errmsg))
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if (!(flags & BINLOG_DUMP_NON_BLOCK) &&
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mysql_bin_log.is_active(log_file_name))
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Block until there is more data in the log
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errmsg = "failed on net_flush()";
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my_errno= ER_UNKNOWN_ERROR;
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We may have missed the update broadcast from the log
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that has just happened, let's try to catch it if it did.
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If we did not miss anything, we just wait for other threads
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bool read_packet = 0, fatal_error = 0;
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No one will update the log while we are reading
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now, but we'll be quick and just read one record
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Add an counter that is incremented for each time we update the
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binary log. We can avoid the following read if the counter
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has not been updated since last read.
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pthread_mutex_lock(log_lock);
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switch (Log_event::read_log_event(&log, packet, (pthread_mutex_t*)0)) {
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/* we read successfully, so we'll need to send it to the slave */
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pthread_mutex_unlock(log_lock);
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coord->pos= uint4korr(packet->ptr() + 1 + LOG_POS_OFFSET);
679
if (thd->server_id==0) // for mysqlbinlog (mysqlbinlog.server_id==0)
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pthread_mutex_unlock(log_lock);
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assert(heartbeat_ts && heartbeat_period != 0L);
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set_timespec_nsec(*heartbeat_ts, heartbeat_period);
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ret= mysql_bin_log.wait_for_update_bin_log(thd, heartbeat_ts);
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assert(ret == 0 || (heartbeat_period != 0L && coord != NULL));
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if (ret == ETIMEDOUT || ret == ETIME)
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if (send_heartbeat_event(net, packet, coord))
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errmsg = "Failed on my_net_write()";
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my_errno= ER_UNKNOWN_ERROR;
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pthread_mutex_unlock(log_lock);
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} while (ret != 0 && coord != NULL && !thd->killed);
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pthread_mutex_unlock(log_lock);
714
pthread_mutex_unlock(log_lock);
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thd->set_proc_info("Sending binlog event to slave");
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if (my_net_write(net, (unsigned char*) packet->ptr(), packet->length()) )
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errmsg = "Failed on my_net_write()";
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my_errno= ER_UNKNOWN_ERROR;
729
if ((*packet)[LOG_EVENT_OFFSET+1] == LOAD_EVENT)
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errmsg = "failed in send_file()";
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my_errno= ER_UNKNOWN_ERROR;
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packet->set("\0", 1, &my_charset_bin);
740
No need to net_flush because we will get to flush later when
741
we hit EOF pretty quick
747
errmsg = "error reading log entry";
748
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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bool loop_breaker = 0;
757
/* need this to break out of the for loop from switch */
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thd->set_proc_info("Finished reading one binlog; switching to next binlog");
760
switch (mysql_bin_log.find_next_log(&linfo, 1)) {
762
loop_breaker = (flags & BINLOG_DUMP_NON_BLOCK);
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errmsg = "could not find next log";
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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(void) my_close(file, MYF(MY_WME));
779
Call fake_rotate_event() in case the previous log (the one which
780
we have just finished reading) did not contain a Rotate event
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(for example (I don't know any other example) the previous log
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was the last one before the master was shutdown & restarted).
783
This way we tell the slave about the new log's name and
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position. If the binlog is 5.0, the next event we are going to
785
read and send is Format_description_log_event.
787
if ((file=open_binlog(&log, log_file_name, &errmsg)) < 0 ||
788
fake_rotate_event(net, packet, log_file_name, BIN_LOG_HEADER_SIZE,
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my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
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packet->append('\0');
798
coord->file_name= log_file_name; // reset to the next
804
(void)my_close(file, MYF(MY_WME));
807
thd->set_proc_info("Waiting to finalize termination");
808
pthread_mutex_lock(&LOCK_thread_count);
809
thd->current_linfo = 0;
810
pthread_mutex_unlock(&LOCK_thread_count);
814
thd->set_proc_info("Waiting to finalize termination");
817
Exclude iteration through thread list
818
this is needed for purge_logs() - it will iterate through
819
thread list and update thd->current_linfo->index_file_offset
820
this mutex will make sure that it never tried to update our linfo
821
after we return from this stack frame
823
pthread_mutex_lock(&LOCK_thread_count);
824
thd->current_linfo = 0;
825
pthread_mutex_unlock(&LOCK_thread_count);
827
(void) my_close(file, MYF(MY_WME));
829
my_message(my_errno, errmsg, MYF(0));
833
int start_slave(THD* thd , Master_info* mi, bool net_report)
838
lock_slave_threads(mi); // this allows us to cleanly read slave_running
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// Get a mask of _stopped_ threads
840
init_thread_mask(&thread_mask,mi,1 /* inverse */);
842
Below we will start all stopped threads. But if the user wants to
843
start only one thread, do as if the other thread was running (as we
844
don't wan't to touch the other thread), so set the bit to 0 for the
847
if (thd->lex->slave_thd_opt)
848
thread_mask&= thd->lex->slave_thd_opt;
849
if (thread_mask) //some threads are stopped, start them
851
if (mi->init_master_info(master_info_file, relay_log_info_file, thread_mask))
852
slave_errno=ER_MASTER_INFO;
853
else if (server_id_supplied && *mi->getHostname())
856
If we will start SQL thread we will care about UNTIL options If
857
not and they are specified we will ignore them and warn user
860
if (thread_mask & SLAVE_SQL)
862
pthread_mutex_lock(&mi->rli.data_lock);
864
if (thd->lex->mi.pos)
866
mi->rli.until_condition= Relay_log_info::UNTIL_MASTER_POS;
867
mi->rli.until_log_pos= thd->lex->mi.pos;
869
We don't check thd->lex->mi.log_file_name for NULL here
870
since it is checked in sql_yacc.yy
872
strmake(mi->rli.until_log_name, thd->lex->mi.log_file_name,
873
sizeof(mi->rli.until_log_name)-1);
875
else if (thd->lex->mi.relay_log_pos)
877
mi->rli.until_condition= Relay_log_info::UNTIL_RELAY_POS;
878
mi->rli.until_log_pos= thd->lex->mi.relay_log_pos;
879
strmake(mi->rli.until_log_name, thd->lex->mi.relay_log_name,
880
sizeof(mi->rli.until_log_name)-1);
883
mi->rli.clear_until_condition();
885
if (mi->rli.until_condition != Relay_log_info::UNTIL_NONE)
887
/* Preparing members for effective until condition checking */
888
const char *p= fn_ext(mi->rli.until_log_name);
893
mi->rli.until_log_name_extension= strtoul(++p,&p_end, 10);
895
p_end points to the first invalid character. If it equals
896
to p, no digits were found, error. If it contains '\0' it
897
means conversion went ok.
899
if (p_end==p || *p_end)
900
slave_errno=ER_BAD_SLAVE_UNTIL_COND;
903
slave_errno=ER_BAD_SLAVE_UNTIL_COND;
905
/* mark the cached result of the UNTIL comparison as "undefined" */
906
mi->rli.until_log_names_cmp_result=
907
Relay_log_info::UNTIL_LOG_NAMES_CMP_UNKNOWN;
909
/* Issuing warning then started without --skip-slave-start */
910
if (!opt_skip_slave_start)
911
push_warning(thd, DRIZZLE_ERROR::WARN_LEVEL_NOTE,
912
ER_MISSING_SKIP_SLAVE,
913
ER(ER_MISSING_SKIP_SLAVE));
916
pthread_mutex_unlock(&mi->rli.data_lock);
918
else if (thd->lex->mi.pos || thd->lex->mi.relay_log_pos)
919
push_warning(thd, DRIZZLE_ERROR::WARN_LEVEL_NOTE, ER_UNTIL_COND_IGNORED,
920
ER(ER_UNTIL_COND_IGNORED));
923
slave_errno = start_slave_threads(0 /*no mutex */,
924
1 /* wait for start */,
926
master_info_file,relay_log_info_file,
930
slave_errno = ER_BAD_SLAVE;
934
/* no error if all threads are already started, only a warning */
935
push_warning(thd, DRIZZLE_ERROR::WARN_LEVEL_NOTE, ER_SLAVE_WAS_RUNNING,
936
ER(ER_SLAVE_WAS_RUNNING));
939
unlock_slave_threads(mi);
944
my_message(slave_errno, ER(slave_errno), MYF(0));
954
int stop_slave(THD* thd, Master_info* mi, bool net_report )
960
thd->set_proc_info("Killing slave");
962
lock_slave_threads(mi);
963
// Get a mask of _running_ threads
964
init_thread_mask(&thread_mask,mi,0 /* not inverse*/);
966
Below we will stop all running threads.
967
But if the user wants to stop only one thread, do as if the other thread
968
was stopped (as we don't wan't to touch the other thread), so set the
969
bit to 0 for the other thread
971
if (thd->lex->slave_thd_opt)
972
thread_mask &= thd->lex->slave_thd_opt;
976
slave_errno= terminate_slave_threads(mi,thread_mask,
981
//no error if both threads are already stopped, only a warning
983
push_warning(thd, DRIZZLE_ERROR::WARN_LEVEL_NOTE, ER_SLAVE_WAS_NOT_RUNNING,
984
ER(ER_SLAVE_WAS_NOT_RUNNING));
986
unlock_slave_threads(mi);
987
thd->set_proc_info(0);
992
my_message(slave_errno, ER(slave_errno), MYF(0));
1003
Remove all relay logs and start replication from the start
1008
mi Master info for the slave
1016
int reset_slave(THD *thd, Master_info* mi)
1018
struct stat stat_area;
1019
char fname[FN_REFLEN];
1020
int thread_mask= 0, error= 0;
1021
uint32_t sql_errno=0;
1022
const char* errmsg=0;
1024
lock_slave_threads(mi);
1025
init_thread_mask(&thread_mask,mi,0 /* not inverse */);
1026
if (thread_mask) // We refuse if any slave thread is running
1028
sql_errno= ER_SLAVE_MUST_STOP;
1033
// delete relay logs, clear relay log coordinates
1034
if ((error= purge_relay_logs(&mi->rli, thd,
1039
/* Clear master's log coordinates */
1042
Reset errors (the idea is that we forget about the
1045
mi->rli.clear_error();
1046
mi->rli.clear_until_condition();
1048
// close master_info_file, relay_log_info_file, set mi->inited=rli->inited=0
1049
mi->end_master_info();
1050
// and delete these two files
1051
fn_format(fname, master_info_file, mysql_data_home, "", 4+32);
1052
if (!stat(fname, &stat_area) && my_delete(fname, MYF(MY_WME)))
1057
// delete relay_log_info_file
1058
fn_format(fname, relay_log_info_file, mysql_data_home, "", 4+32);
1059
if (!stat(fname, &stat_area) && my_delete(fname, MYF(MY_WME)))
1066
unlock_slave_threads(mi);
1068
my_error(sql_errno, MYF(0), errmsg);
1074
Kill all Binlog_dump threads which previously talked to the same slave
1075
("same" means with the same server id). Indeed, if the slave stops, if the
1076
Binlog_dump thread is waiting (pthread_cond_wait) for binlog update, then it
1077
will keep existing until a query is written to the binlog. If the master is
1078
idle, then this could last long, and if the slave reconnects, we could have 2
1079
Binlog_dump threads in SHOW PROCESSLIST, until a query is written to the
1080
binlog. To avoid this, when the slave reconnects and sends COM_BINLOG_DUMP,
1081
the master kills any existing thread with the slave's server id (if this id is
1082
not zero; it will be true for real slaves, but false for mysqlbinlog when it
1083
sends COM_BINLOG_DUMP to get a remote binlog dump).
1086
kill_zombie_dump_threads()
1087
slave_server_id the slave's server id
1092
void kill_zombie_dump_threads(uint32_t slave_server_id)
1094
pthread_mutex_lock(&LOCK_thread_count);
1095
I_List_iterator<THD> it(threads);
1100
if (tmp->command == COM_BINLOG_DUMP &&
1101
tmp->server_id == slave_server_id)
1103
pthread_mutex_lock(&tmp->LOCK_delete); // Lock from delete
1107
pthread_mutex_unlock(&LOCK_thread_count);
1111
Here we do not call kill_one_thread() as
1112
it will be slow because it will iterate through the list
1113
again. We just to do kill the thread ourselves.
1115
tmp->awake(THD::KILL_QUERY);
1116
pthread_mutex_unlock(&tmp->LOCK_delete);
1121
bool change_master(THD* thd, Master_info* mi)
1124
const char* errmsg= 0;
1125
bool need_relay_log_purge= 1;
1127
lock_slave_threads(mi);
1128
init_thread_mask(&thread_mask,mi,0 /*not inverse*/);
1129
if (thread_mask) // We refuse if any slave thread is running
1131
my_message(ER_SLAVE_MUST_STOP, ER(ER_SLAVE_MUST_STOP), MYF(0));
1132
unlock_slave_threads(mi);
1136
thd->set_proc_info("Changing master");
1137
LEX_MASTER_INFO* lex_mi= &thd->lex->mi;
1138
// TODO: see if needs re-write
1139
if (mi->init_master_info(master_info_file, relay_log_info_file, thread_mask))
1141
my_message(ER_MASTER_INFO, ER(ER_MASTER_INFO), MYF(0));
1142
unlock_slave_threads(mi);
1147
Data lock not needed since we have already stopped the running threads,
1148
and we have the hold on the run locks which will keep all threads that
1149
could possibly modify the data structures from running
1153
If the user specified host or port without binlog or position,
1154
reset binlog's name to FIRST and position to 4.
1157
if ((lex_mi->host || lex_mi->port) && !lex_mi->log_file_name && !lex_mi->pos)
1160
if (lex_mi->log_file_name)
1161
mi->setLogName(lex_mi->log_file_name);
1164
mi->setLogPosition(lex_mi->pos);
1168
mi->setHost(lex_mi->host, lex_mi->port);
1170
mi->setUsername(lex_mi->user);
1171
if (lex_mi->password)
1172
mi->setPassword(lex_mi->password);
1173
if (lex_mi->connect_retry)
1174
mi->connect_retry = lex_mi->connect_retry;
1175
if (lex_mi->heartbeat_opt != LEX_MASTER_INFO::LEX_MI_UNCHANGED)
1176
mi->heartbeat_period = lex_mi->heartbeat_period;
1178
mi->heartbeat_period= (float) cmin((double)SLAVE_MAX_HEARTBEAT_PERIOD,
1179
(slave_net_timeout/2.0));
1180
mi->received_heartbeats= 0L; // counter lives until master is CHANGEd
1182
if (lex_mi->relay_log_name)
1184
need_relay_log_purge= 0;
1185
mi->rli.event_relay_log_name.assign(lex_mi->relay_log_name);
1188
if (lex_mi->relay_log_pos)
1190
need_relay_log_purge= 0;
1191
mi->rli.group_relay_log_pos= mi->rli.event_relay_log_pos= lex_mi->relay_log_pos;
1195
If user did specify neither host nor port nor any log name nor any log
1196
pos, i.e. he specified only user/password/master_connect_retry, he probably
1197
wants replication to resume from where it had left, i.e. from the
1198
coordinates of the **SQL** thread (imagine the case where the I/O is ahead
1199
of the SQL; restarting from the coordinates of the I/O would lose some
1200
events which is probably unwanted when you are just doing minor changes
1201
like changing master_connect_retry).
1202
A side-effect is that if only the I/O thread was started, this thread may
1203
restart from ''/4 after the CHANGE MASTER. That's a minor problem (it is a
1204
much more unlikely situation than the one we are fixing here).
1205
Note: coordinates of the SQL thread must be read here, before the
1206
'if (need_relay_log_purge)' block which resets them.
1208
if (!lex_mi->host && !lex_mi->port &&
1209
!lex_mi->log_file_name && !lex_mi->pos &&
1210
need_relay_log_purge)
1213
Sometimes mi->rli.master_log_pos == 0 (it happens when the SQL thread is
1214
not initialized), so we use a cmax().
1215
What happens to mi->rli.master_log_pos during the initialization stages
1216
of replication is not 100% clear, so we guard against problems using
1219
mi->setLogPosition(((BIN_LOG_HEADER_SIZE > mi->rli.group_master_log_pos)
1220
? BIN_LOG_HEADER_SIZE
1221
: mi->rli.group_master_log_pos));
1222
mi->setLogName(mi->rli.group_master_log_name.c_str());
1225
Relay log's IO_CACHE may not be inited, if rli->inited==0 (server was never
1230
my_error(ER_RELAY_LOG_INIT, MYF(0), "Failed to flush master info file");
1231
unlock_slave_threads(mi);
1234
if (need_relay_log_purge)
1237
thd->set_proc_info("Purging old relay logs");
1238
if (purge_relay_logs(&mi->rli, thd,
1239
0 /* not only reset, but also reinit */,
1242
my_error(ER_RELAY_LOG_FAIL, MYF(0), errmsg);
1243
unlock_slave_threads(mi);
1251
/* Relay log is already initialized */
1252
if (init_relay_log_pos(&mi->rli,
1253
mi->rli.group_relay_log_name.c_str(),
1254
mi->rli.group_relay_log_pos,
1258
my_error(ER_RELAY_LOG_INIT, MYF(0), msg);
1259
unlock_slave_threads(mi);
1264
Coordinates in rli were spoilt by the 'if (need_relay_log_purge)' block,
1265
so restore them to good values. If we left them to ''/0, that would work;
1266
but that would fail in the case of 2 successive CHANGE MASTER (without a
1267
START SLAVE in between): because first one would set the coords in mi to
1268
the good values of those in rli, the set those in rli to ''/0, then
1269
second CHANGE MASTER would set the coords in mi to those of rli, i.e. to
1270
''/0: we have lost all copies of the original good coordinates.
1271
That's why we always save good coords in rli.
1273
mi->rli.group_master_log_pos= mi->getLogPosition();
1274
mi->rli.group_master_log_name.assign(mi->getLogName());
1276
if (mi->rli.group_master_log_name.size() == 0) // uninitialized case
1277
mi->rli.group_master_log_pos= 0;
1279
pthread_mutex_lock(&mi->rli.data_lock);
1280
mi->rli.abort_pos_wait++; /* for MASTER_POS_WAIT() to abort */
1281
/* Clear the errors, for a clean start */
1282
mi->rli.clear_error();
1283
mi->rli.clear_until_condition();
1285
If we don't write new coordinates to disk now, then old will remain in
1286
relay-log.info until START SLAVE is issued; but if mysqld is shutdown
1287
before START SLAVE, then old will remain in relay-log.info, and will be the
1288
in-memory value at restart (thus causing errors, as the old relay log does
1291
flush_relay_log_info(&mi->rli);
1292
pthread_cond_broadcast(&mi->data_cond);
1293
pthread_mutex_unlock(&mi->rli.data_lock);
1295
unlock_slave_threads(mi);
1296
thd->set_proc_info(0);
1301
int reset_master(THD* thd)
1303
if (!mysql_bin_log.is_open())
1305
my_message(ER_FLUSH_MASTER_BINLOG_CLOSED,
1306
ER(ER_FLUSH_MASTER_BINLOG_CLOSED), MYF(ME_BELL+ME_WAITTANG));
1309
return mysql_bin_log.reset_logs(thd);
1312
int cmp_master_pos(const char* log_file_name1, uint64_t log_pos1,
1313
const char* log_file_name2, uint64_t log_pos2)
1316
uint32_t log_file_name1_len= strlen(log_file_name1);
1317
uint32_t log_file_name2_len= strlen(log_file_name2);
1319
// We assume that both log names match up to '.'
1320
if (log_file_name1_len == log_file_name2_len)
1322
if ((res= strcmp(log_file_name1, log_file_name2)))
1324
return (log_pos1 < log_pos2) ? -1 : (log_pos1 == log_pos2) ? 0 : 1;
1326
return ((log_file_name1_len < log_file_name2_len) ? -1 : 1);
1330
bool show_binlog_info(THD* thd)
1332
Protocol *protocol= thd->protocol;
1333
List<Item> field_list;
1334
field_list.push_back(new Item_empty_string("File", FN_REFLEN));
1335
field_list.push_back(new Item_return_int("Position",20,
1336
DRIZZLE_TYPE_LONGLONG));
1337
field_list.push_back(new Item_empty_string("Binlog_Do_DB",255));
1338
field_list.push_back(new Item_empty_string("Binlog_Ignore_DB",255));
1340
if (protocol->send_fields(&field_list,
1341
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
1343
protocol->prepare_for_resend();
1345
if (mysql_bin_log.is_open())
1348
mysql_bin_log.get_current_log(&li);
1349
int dir_len = dirname_length(li.log_file_name);
1350
protocol->store(li.log_file_name + dir_len, &my_charset_bin);
1351
protocol->store((uint64_t) li.pos);
1352
protocol->store(binlog_filter->get_do_db());
1353
protocol->store(binlog_filter->get_ignore_db());
1354
if (protocol->write())
1363
Send a list of all binary logs to client
1367
thd Thread specific variable
1374
bool show_binlogs(THD* thd)
1376
IO_CACHE *index_file;
1379
char fname[FN_REFLEN];
1380
List<Item> field_list;
1383
Protocol *protocol= thd->protocol;
1385
if (!mysql_bin_log.is_open())
1387
my_message(ER_NO_BINARY_LOGGING, ER(ER_NO_BINARY_LOGGING), MYF(0));
1391
field_list.push_back(new Item_empty_string("Log_name", 255));
1392
field_list.push_back(new Item_return_int("File_size", 20,
1393
DRIZZLE_TYPE_LONGLONG));
1394
if (protocol->send_fields(&field_list,
1395
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
1398
pthread_mutex_lock(mysql_bin_log.get_log_lock());
1399
mysql_bin_log.lock_index();
1400
index_file=mysql_bin_log.get_index_file();
1402
mysql_bin_log.raw_get_current_log(&cur); // dont take mutex
1403
pthread_mutex_unlock(mysql_bin_log.get_log_lock()); // lockdep, OK
1405
cur_dir_len= dirname_length(cur.log_file_name);
1407
reinit_io_cache(index_file, READ_CACHE, (my_off_t) 0, 0, 0);
1409
/* The file ends with EOF or empty line */
1410
while ((length=my_b_gets(index_file, fname, sizeof(fname))) > 1)
1413
uint64_t file_length= 0; // Length if open fails
1414
fname[--length] = '\0'; // remove the newline
1416
protocol->prepare_for_resend();
1417
dir_len= dirname_length(fname);
1419
protocol->store(fname + dir_len, length, &my_charset_bin);
1421
if (!(strncmp(fname+dir_len, cur.log_file_name+cur_dir_len, length)))
1422
file_length= cur.pos; /* The active log, use the active position */
1425
/* this is an old log, open it and find the size */
1426
if ((file= my_open(fname, O_RDONLY,
1429
file_length= (uint64_t) my_seek(file, 0L, MY_SEEK_END, MYF(0));
1430
my_close(file, MYF(0));
1433
protocol->store(file_length);
1434
if (protocol->write())
1437
mysql_bin_log.unlock_index();
1442
mysql_bin_log.unlock_index();
1447
Load data's io cache specific hook to be executed
1448
before a chunk of data is being read into the cache's buffer
1449
The fuction instantianates and writes into the binlog
1450
replication events along LOAD DATA processing.
1452
@param file pointer to io-cache
1455
int log_loaded_block(IO_CACHE* file)
1457
LOAD_FILE_INFO *lf_info;
1459
/* buffer contains position where we started last read */
1460
unsigned char* buffer= (unsigned char*) my_b_get_buffer_start(file);
1461
uint32_t max_event_size= current_thd->variables.max_allowed_packet;
1462
lf_info= (LOAD_FILE_INFO*) file->arg;
1463
if (lf_info->thd->current_stmt_binlog_row_based)
1465
if (lf_info->last_pos_in_file != HA_POS_ERROR &&
1466
lf_info->last_pos_in_file >= my_b_get_pos_in_file(file))
1469
for (block_len= my_b_get_bytes_in_buffer(file); block_len > 0;
1470
buffer += cmin(block_len, max_event_size),
1471
block_len -= cmin(block_len, max_event_size))
1473
lf_info->last_pos_in_file= my_b_get_pos_in_file(file);
1474
if (lf_info->wrote_create_file)
1476
Append_block_log_event a(lf_info->thd, lf_info->thd->db, buffer,
1477
cmin(block_len, max_event_size),
1478
lf_info->log_delayed);
1479
mysql_bin_log.write(&a);
1483
Begin_load_query_log_event b(lf_info->thd, lf_info->thd->db,
1485
cmin(block_len, max_event_size),
1486
lf_info->log_delayed);
1487
mysql_bin_log.write(&b);
1488
lf_info->wrote_create_file= 1;
1495
Replication System Variables
1498
class sys_var_slave_skip_counter :public sys_var
1501
sys_var_slave_skip_counter(sys_var_chain *chain, const char *name_arg)
1503
{ chain_sys_var(chain); }
1504
bool check(THD *thd, set_var *var);
1505
bool update(THD *thd, set_var *var);
1506
bool check_type(enum_var_type type) { return type != OPT_GLOBAL; }
1508
We can't retrieve the value of this, so we don't have to define
1509
type() or value_ptr()
1513
class sys_var_sync_binlog_period :public sys_var_long_ptr
1516
sys_var_sync_binlog_period(sys_var_chain *chain, const char *name_arg,
1518
:sys_var_long_ptr(chain, name_arg,value_ptr) {}
1519
bool update(THD *thd, set_var *var);
1522
static void fix_slave_net_timeout(THD *thd,
1523
enum_var_type type __attribute__((unused)))
1525
pthread_mutex_lock(&LOCK_active_mi);
1526
if (active_mi && slave_net_timeout < active_mi->heartbeat_period)
1527
push_warning_printf(thd, DRIZZLE_ERROR::WARN_LEVEL_WARN,
1528
ER_SLAVE_HEARTBEAT_VALUE_OUT_OF_RANGE,
1529
"The currect value for master_heartbeat_period"
1530
" exceeds the new value of `slave_net_timeout' sec."
1531
" A sensible value for the period should be"
1532
" less than the timeout.");
1533
pthread_mutex_unlock(&LOCK_active_mi);
1537
static sys_var_chain vars = { NULL, NULL };
1539
static sys_var_bool_ptr sys_relay_log_purge(&vars, "relay_log_purge",
1541
static sys_var_long_ptr sys_slave_net_timeout(&vars, "slave_net_timeout",
1543
fix_slave_net_timeout);
1544
static sys_var_long_ptr sys_slave_trans_retries(&vars, "slave_transaction_retries",
1545
&slave_trans_retries);
1546
static sys_var_sync_binlog_period sys_sync_binlog_period(&vars, "sync_binlog", &sync_binlog_period);
1547
static sys_var_slave_skip_counter sys_slave_skip_counter(&vars, "sql_slave_skip_counter");
1549
static int show_slave_skip_errors(THD *thd, SHOW_VAR *var, char *buff);
1552
static int show_slave_skip_errors(THD *thd __attribute__((unused)),
1553
SHOW_VAR *var, char *buff)
1555
var->type=SHOW_CHAR;
1557
if (!use_slave_mask || bitmap_is_clear_all(&slave_error_mask))
1559
var->value= const_cast<char *>("OFF");
1561
else if (bitmap_is_set_all(&slave_error_mask))
1563
var->value= const_cast<char *>("ALL");
1567
/* 10 is enough assuming errors are max 4 digits */
1571
i < MAX_SLAVE_ERROR &&
1572
(buff - var->value) < SHOW_VAR_FUNC_BUFF_SIZE;
1575
if (bitmap_is_set(&slave_error_mask, i))
1577
buff= int10_to_str(i, buff, 10);
1581
if (var->value != buff)
1582
buff--; // Remove last ','
1583
if (i < MAX_SLAVE_ERROR)
1584
buff= my_stpcpy(buff, "..."); // Couldn't show all errors
1590
static st_show_var_func_container
1591
show_slave_skip_errors_cont = { &show_slave_skip_errors };
1594
static SHOW_VAR fixed_vars[]= {
1595
{"log_slave_updates", (char*) &opt_log_slave_updates, SHOW_MY_BOOL},
1596
{"relay_log" , (char*) &opt_relay_logname, SHOW_CHAR_PTR},
1597
{"relay_log_index", (char*) &opt_relaylog_index_name, SHOW_CHAR_PTR},
1598
{"relay_log_info_file", (char*) &relay_log_info_file, SHOW_CHAR_PTR},
1599
{"relay_log_space_limit", (char*) &relay_log_space_limit, SHOW_LONGLONG},
1600
{"slave_load_tmpdir", (char*) &slave_load_tmpdir, SHOW_CHAR_PTR},
1601
{"slave_skip_errors", (char*) &show_slave_skip_errors_cont, SHOW_FUNC},
1604
bool sys_var_slave_skip_counter::check(THD *thd __attribute__((unused)),
1608
pthread_mutex_lock(&LOCK_active_mi);
1609
pthread_mutex_lock(&active_mi->rli.run_lock);
1610
if (active_mi->rli.slave_running)
1612
my_message(ER_SLAVE_MUST_STOP, ER(ER_SLAVE_MUST_STOP), MYF(0));
1615
pthread_mutex_unlock(&active_mi->rli.run_lock);
1616
pthread_mutex_unlock(&LOCK_active_mi);
1617
var->save_result.ulong_value= (ulong) var->value->val_int();
1622
bool sys_var_slave_skip_counter::update(THD *thd __attribute__((unused)),
1625
pthread_mutex_lock(&LOCK_active_mi);
1626
pthread_mutex_lock(&active_mi->rli.run_lock);
1628
The following test should normally never be true as we test this
1629
in the check function; To be safe against multiple
1630
SQL_SLAVE_SKIP_COUNTER request, we do the check anyway
1632
if (!active_mi->rli.slave_running)
1634
pthread_mutex_lock(&active_mi->rli.data_lock);
1635
active_mi->rli.slave_skip_counter= var->save_result.ulong_value;
1636
pthread_mutex_unlock(&active_mi->rli.data_lock);
1638
pthread_mutex_unlock(&active_mi->rli.run_lock);
1639
pthread_mutex_unlock(&LOCK_active_mi);
1644
bool sys_var_sync_binlog_period::update(THD *thd __attribute__((unused)),
1647
sync_binlog_period= (uint32_t) var->save_result.uint64_t_value;
1651
int init_replication_sys_vars()
1653
mysql_append_static_vars(fixed_vars, sizeof(fixed_vars) / sizeof(SHOW_VAR));
1655
if (mysql_add_sys_var_chain(vars.first, my_long_options))
1657
/* should not happen */
1658
fprintf(stderr, "failed to initialize replication system variables");