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Viewing changes to plugin/transaction_log/module.cc

  • Committer: Andrew Hutchings
  • Date: 2010-11-09 13:38:01 UTC
  • mto: (1919.1.2 trunk)
  • mto: This revision was merged to the branch mainline in revision 1920.
  • Revision ID: andrew@linuxjedi.co.uk-20101109133801-byjzsao76346395x
Add FLUSH GLOBAL STATUS; command
Clears the global status variables for the server

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Lines of Context:
plugin/transaction_log/module.cc
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static bool sysvar_transaction_log_enabled= false;
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/** Transaction Log plugin system variable - The path to the log file used */
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static string sysvar_transaction_log_file;
 
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static char* sysvar_transaction_log_file= (char *)DEFAULT_LOG_FILE_PATH;
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/** 
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 * Transaction Log plugin system variable - A debugging variable to assist 
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 * TransactionLog::FLUSH_FREQUENCY_EVERY_WRITE == 1   ... sync on every write
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 * TransactionLog::FLUSH_FREQUENCY_EVERY_SECOND == 2  ... sync at most once a second
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 */
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typedef constrained_check<uint32_t, 2, 0> flush_constraint;
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static flush_constraint sysvar_transaction_log_flush_frequency;
 
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static uint32_t sysvar_transaction_log_flush_frequency= 0;
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/**
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 * Transaction Log plugin system variable - Number of slots to create
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 * for managing write buffers
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 */
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typedef constrained_check<uint32_t, 8192, 4> write_buffers_constraint;
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static write_buffers_constraint sysvar_transaction_log_num_write_buffers;
 
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static uint32_t sysvar_transaction_log_num_write_buffers= 8;
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/**
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 * Transaction Log plugin system variable - The name of the replicator plugin
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 * to pair the transaction log's applier with.  Defaults to "default"
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 */
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static const char DEFAULT_USE_REPLICATOR[]= "default";
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static string sysvar_transaction_log_use_replicator;
 
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static char *sysvar_transaction_log_use_replicator= (char *)DEFAULT_USE_REPLICATOR;
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/** DATA_DICTIONARY views */
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static TransactionLogTool *transaction_log_tool;
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  {
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    (void) close(log_file);
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  }
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}
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static void set_truncate_debug(Session *, sql_var_t)
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{
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  if (transaction_log)
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  {
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    if (sysvar_transaction_log_truncate_debug)
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    {
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      transaction_log->truncate();
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      transaction_log_index->clear();
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      sysvar_transaction_log_truncate_debug= false;
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    }
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  }
 
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  /* These get strdup'd below */
 
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  free(sysvar_transaction_log_file);
 
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  free(sysvar_transaction_log_use_replicator);
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}
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static int init(drizzled::module::Context &context)
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{
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  context.registerVariable(new sys_var_bool_ptr_readonly("enable",
142
 
                                                         &sysvar_transaction_log_enabled));
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  context.registerVariable(new sys_var_bool_ptr("truncate-debug",
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                                                &sysvar_transaction_log_truncate_debug,
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                                                set_truncate_debug));
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  context.registerVariable(new sys_var_const_string("file",
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                                                    sysvar_transaction_log_file));
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  context.registerVariable(new sys_var_const_string("use-replicator",
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                                                    sysvar_transaction_log_use_replicator));
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  context.registerVariable(new sys_var_bool_ptr_readonly("enable-checksum",
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                                                         &sysvar_transaction_log_checksum_enabled));
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  context.registerVariable(new sys_var_constrained_value_readonly<uint32_t>("flush-frequency", sysvar_transaction_log_flush_frequency));
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  context.registerVariable(new sys_var_constrained_value_readonly<uint32_t>("num-write-buffers",
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                                                                            sysvar_transaction_log_num_write_buffers));
 
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  const module::option_map &vm= context.getOptions();
 
131
 
 
132
  if (vm.count("flush-frequency"))
 
133
  {
 
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    if (sysvar_transaction_log_flush_frequency > 2)
 
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    {
 
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      errmsg_printf(ERRMSG_LVL_ERROR, _("Invalid value for sync-method\n"));
 
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      exit(-1);
 
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    }
 
139
  }
 
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141
  if (vm.count("num-write-buffers"))
 
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  {
 
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    if (sysvar_transaction_log_num_write_buffers < 4 || sysvar_transaction_log_num_write_buffers > 8192)
 
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    {
 
145
      errmsg_printf(ERRMSG_LVL_ERROR, _("Invalid value for num-write-buffers\n"));
 
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      exit(-1);
 
147
    }
 
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  }
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  /* Create and initialize the transaction log itself */
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  if (sysvar_transaction_log_enabled)
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  {
 
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    if (vm.count("file"))
 
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    {
 
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      sysvar_transaction_log_file= strdup(vm["file"].as<string>().c_str());
 
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    }
 
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    else
 
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    {
 
160
      sysvar_transaction_log_file= strdup(DEFAULT_LOG_FILE_PATH);
 
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    }
162
162
  
163
 
    transaction_log= new (nothrow) TransactionLog(sysvar_transaction_log_file,
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                                                  static_cast<int>(sysvar_transaction_log_flush_frequency),
 
163
    if (vm.count("use-replicator"))
 
164
    {
 
165
      sysvar_transaction_log_use_replicator= strdup(vm["use-replicator"].as<string>().c_str());
 
166
    }
 
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    else
 
168
    {
 
169
      sysvar_transaction_log_use_replicator= strdup(DEFAULT_USE_REPLICATOR);
 
170
    }
 
171
    transaction_log= new (nothrow) TransactionLog(string(sysvar_transaction_log_file),
 
172
                                                  sysvar_transaction_log_flush_frequency,
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                                                  sysvar_transaction_log_checksum_enabled);
166
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167
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    if (transaction_log == NULL)
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    transaction_log_applier= new (nothrow) TransactionLogApplier("transaction_log_applier",
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                                                                 transaction_log, 
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                                                                 transaction_log_index, 
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                                                                 static_cast<uint32_t>(sysvar_transaction_log_num_write_buffers));
 
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                                                                 sysvar_transaction_log_num_write_buffers);
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    if (transaction_log_applier == NULL)
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    {
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      char errmsg[STRERROR_MAX];
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    }
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    context.add(transaction_log_applier);
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    ReplicationServices &replication_services= ReplicationServices::singleton();
222
 
    replication_services.attachApplier(transaction_log_applier,
223
 
                                       sysvar_transaction_log_use_replicator);
 
230
    string replicator_name(sysvar_transaction_log_use_replicator);
 
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    replication_services.attachApplier(transaction_log_applier, replicator_name);
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    /* Setup DATA_DICTIONARY views */
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}
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static void set_truncate_debug(Session *,
 
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                               drizzle_sys_var *, 
 
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                               void *, 
 
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                               const void *save)
 
266
{
 
267
  /* 
 
268
   * The const void * save comes directly from the check function, 
 
269
   * which should simply return the result from the set statement. 
 
270
   */
 
271
  if (transaction_log)
 
272
  {
 
273
    if (*(bool *)save != false)
 
274
    {
 
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      transaction_log->truncate();
 
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      transaction_log_index->clear();
 
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    }
 
278
  }
 
279
}
 
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281
static DRIZZLE_SYSVAR_BOOL(enable,
 
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                           sysvar_transaction_log_enabled,
 
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                           PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
 
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                           N_("Enable transaction log"),
 
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                           NULL, /* check func */
 
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                           NULL, /* update func */
 
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                           false /* default */);
 
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static DRIZZLE_SYSVAR_BOOL(truncate_debug,
 
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                           sysvar_transaction_log_truncate_debug,
 
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                           PLUGIN_VAR_NOCMDARG,
 
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                           N_("DEBUGGING - Truncate transaction log"),
 
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                           NULL, /* check func */
 
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                           set_truncate_debug, /* update func */
 
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                           false /* default */);
 
296
 
 
297
static DRIZZLE_SYSVAR_STR(file,
 
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                          sysvar_transaction_log_file,
 
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                          PLUGIN_VAR_READONLY,
 
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                          N_("Path to the file to use for transaction log"),
 
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                          NULL, /* check func */
 
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                          NULL, /* update func*/
 
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                          DEFAULT_LOG_FILE_PATH /* default */);
 
304
 
 
305
static DRIZZLE_SYSVAR_STR(use_replicator,
 
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                          sysvar_transaction_log_use_replicator,
 
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                          PLUGIN_VAR_READONLY,
 
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                          N_("Name of the replicator plugin to use (default='default_replicator')"),
 
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                          NULL, /* check func */
 
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                          NULL, /* update func*/
 
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                          DEFAULT_USE_REPLICATOR /* default */);
 
312
 
 
313
static DRIZZLE_SYSVAR_BOOL(enable_checksum,
 
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                           sysvar_transaction_log_checksum_enabled,
 
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                           PLUGIN_VAR_NOCMDARG,
 
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                           N_("Enable CRC32 Checksumming of each written transaction log entry"),
 
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                           NULL, /* check func */
 
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                           NULL, /* update func */
 
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                           false /* default */);
 
320
 
 
321
static DRIZZLE_SYSVAR_UINT(flush_frequency,
 
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                           sysvar_transaction_log_flush_frequency,
 
323
                           PLUGIN_VAR_OPCMDARG,
 
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                           N_("0 == rely on operating system to sync log file (default), "
 
325
                              "1 == sync file at each transaction write, "
 
326
                              "2 == sync log file once per second"),
 
327
                           NULL, /* check func */
 
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                           NULL, /* update func */
 
329
                           0, /* default */
 
330
                           0,
 
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                           2,
 
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                           0);
 
333
 
 
334
static DRIZZLE_SYSVAR_UINT(num_write_buffers,
 
335
                           sysvar_transaction_log_num_write_buffers,
 
336
                           PLUGIN_VAR_OPCMDARG,
 
337
                           N_("Number of slots for in-memory write buffers (default=8)."),
 
338
                           NULL, /* check func */
 
339
                           NULL, /* update func */
 
340
                           8, /* default */
 
341
                           4,
 
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                           8192,
 
343
                           0);
 
344
 
254
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static void init_options(drizzled::module::option_context &context)
255
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{
256
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  context("truncate-debug",
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          po::value<bool>(&sysvar_transaction_log_enabled)->default_value(false)->zero_tokens(),
264
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          N_("Enable transaction log"));
265
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  context("file",
266
 
          po::value<string>(&sysvar_transaction_log_file)->default_value(DEFAULT_LOG_FILE_PATH),
 
357
          po::value<string>(),
267
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          N_("Path to the file to use for transaction log"));
268
359
  context("use-replicator",
269
 
          po::value<string>(&sysvar_transaction_log_use_replicator)->default_value(DEFAULT_USE_REPLICATOR),
 
360
          po::value<string>(),
270
361
          N_("Name of the replicator plugin to use (default='default_replicator')")); 
271
362
  context("flush-frequency",
272
 
          po::value<flush_constraint>(&sysvar_transaction_log_flush_frequency)->default_value(0),
 
363
          po::value<uint32_t>(&sysvar_transaction_log_flush_frequency)->default_value(0),
273
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          N_("0 == rely on operating system to sync log file (default), 1 == sync file at each transaction write, 2 == sync log file once per second"));
274
365
  context("num-write-buffers",
275
 
          po::value<write_buffers_constraint>(&sysvar_transaction_log_num_write_buffers)->default_value(8),
 
366
          po::value<uint32_t>(&sysvar_transaction_log_num_write_buffers)->default_value(8),
276
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          N_("Number of slots for in-memory write buffers (default=8)."));
277
368
}
278
369
 
279
 
DRIZZLE_PLUGIN(init, NULL, init_options);
 
370
static drizzle_sys_var* sys_variables[]= {
 
371
  DRIZZLE_SYSVAR(enable),
 
372
  DRIZZLE_SYSVAR(truncate_debug),
 
373
  DRIZZLE_SYSVAR(file),
 
374
  DRIZZLE_SYSVAR(enable_checksum),
 
375
  DRIZZLE_SYSVAR(flush_frequency),
 
376
  DRIZZLE_SYSVAR(num_write_buffers),
 
377
  DRIZZLE_SYSVAR(use_replicator),
 
378
  NULL
 
379
};
 
380
 
 
381
DRIZZLE_PLUGIN(init, sys_variables, init_options);