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|
/************************************************************************
The index tree adaptive search
(c) 1996 Innobase Oy
Created 2/17/1996 Heikki Tuuri
*************************************************************************/
#include "btr0sea.h"
#ifdef UNIV_NONINL
#include "btr0sea.ic"
#endif
#include "buf0buf.h"
#include "page0page.h"
#include "page0cur.h"
#include "btr0cur.h"
#include "btr0pcur.h"
#include "btr0btr.h"
#include "ha0ha.h"
ulint btr_search_this_is_zero = 0; /* A dummy variable to fool the
compiler */
#ifdef UNIV_SEARCH_PERF_STAT
ulint btr_search_n_succ = 0;
ulint btr_search_n_hash_fail = 0;
#endif /* UNIV_SEARCH_PERF_STAT */
byte btr_sea_pad1[64]; /* padding to prevent other memory update
hotspots from residing on the same memory
cache line as btr_search_latch */
/* The latch protecting the adaptive search system: this latch protects the
(1) positions of records on those pages where a hash index has been built.
NOTE: It does not protect values of non-ordering fields within a record from
being updated in-place! We can use fact (1) to perform unique searches to
indexes. */
rw_lock_t* btr_search_latch_temp; /* We will allocate the latch from
dynamic memory to get it to the
same DRAM page as other hotspot
semaphores */
byte btr_sea_pad2[64]; /* padding to prevent other memory update
hotspots from residing on the same memory
cache line */
btr_search_sys_t* btr_search_sys;
/* If the number of records on the page divided by this parameter
would have been successfully accessed using a hash index, the index
is then built on the page, assuming the global limit has been reached */
#define BTR_SEARCH_PAGE_BUILD_LIMIT 16
/* The global limit for consecutive potentially successful hash searches,
before hash index building is started */
#define BTR_SEARCH_BUILD_LIMIT 100
/************************************************************************
Builds a hash index on a page with the given parameters. If the page already
has a hash index with different parameters, the old hash index is removed.
If index is non-NULL, this function checks if n_fields and n_bytes are
sensible values, and does not build a hash index if not. */
static
void
btr_search_build_page_hash_index(
/*=============================*/
dict_index_t* index, /* in: index for which to build, or NULL if
not known */
page_t* page, /* in: index page, s- or x-latched */
ulint n_fields,/* in: hash this many full fields */
ulint n_bytes,/* in: hash this many bytes from the next
field */
ibool left_side);/* in: hash for searches from left side? */
/*********************************************************************
This function should be called before reserving any btr search mutex, if
the intended operation might add nodes to the search system hash table.
Because of the latching order, once we have reserved the btr search system
latch, we cannot allocate a free frame from the buffer pool. Checks that
there is a free buffer frame allocated for hash table heap in the btr search
system. If not, allocates a free frames for the heap. This check makes it
probable that, when have reserved the btr search system latch and we need to
allocate a new node to the hash table, it will succeed. However, the check
will not guarantee success. */
static
void
btr_search_check_free_space_in_heap(void)
/*=====================================*/
{
buf_frame_t* frame;
hash_table_t* table;
mem_heap_t* heap;
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
table = btr_search_sys->hash_index;
heap = table->heap;
/* Note that we peek the value of heap->free_block without reserving
the latch: this is ok, because we will not guarantee that there will
be enough free space in the hash table. */
if (heap->free_block == NULL) {
frame = buf_frame_alloc();
rw_lock_x_lock(&btr_search_latch);
if (heap->free_block == NULL) {
heap->free_block = frame;
} else {
buf_frame_free(frame);
}
rw_lock_x_unlock(&btr_search_latch);
}
}
/*********************************************************************
Creates and initializes the adaptive search system at a database start. */
void
btr_search_sys_create(
/*==================*/
ulint hash_size) /* in: hash index hash table size */
{
/* We allocate the search latch from dynamic memory:
see above at the global variable definition */
btr_search_latch_temp = mem_alloc(sizeof(rw_lock_t));
rw_lock_create(&btr_search_latch, SYNC_SEARCH_SYS);
btr_search_sys = mem_alloc(sizeof(btr_search_sys_t));
btr_search_sys->hash_index = ha_create(TRUE, hash_size, 0, 0);
}
/*********************************************************************
Creates and initializes a search info struct. */
btr_search_t*
btr_search_info_create(
/*===================*/
/* out, own: search info struct */
mem_heap_t* heap) /* in: heap where created */
{
btr_search_t* info;
info = mem_heap_alloc(heap, sizeof(btr_search_t));
#ifdef UNIV_DEBUG
info->magic_n = BTR_SEARCH_MAGIC_N;
#endif /* UNIV_DEBUG */
info->root_guess = NULL;
info->hash_analysis = 0;
info->n_hash_potential = 0;
info->last_hash_succ = FALSE;
#ifdef UNIV_SEARCH_PERF_STAT
info->n_hash_succ = 0;
info->n_hash_fail = 0;
info->n_patt_succ = 0;
info->n_searches = 0;
#endif /* UNIV_SEARCH_PERF_STAT */
/* Set some sensible values */
info->n_fields = 1;
info->n_bytes = 0;
info->left_side = TRUE;
return(info);
}
/*************************************************************************
Updates the search info of an index about hash successes. NOTE that info
is NOT protected by any semaphore, to save CPU time! Do not assume its fields
are consistent. */
static
void
btr_search_info_update_hash(
/*========================*/
btr_search_t* info, /* in/out: search info */
btr_cur_t* cursor) /* in: cursor which was just positioned */
{
dict_index_t* index;
ulint n_unique;
int cmp;
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
index = cursor->index;
if (index->type & DICT_IBUF) {
/* So many deletes are performed on an insert buffer tree
that we do not consider a hash index useful on it: */
return;
}
n_unique = dict_index_get_n_unique_in_tree(index);
if (info->n_hash_potential == 0) {
goto set_new_recomm;
}
/* Test if the search would have succeeded using the recommended
hash prefix */
if (info->n_fields >= n_unique && cursor->up_match >= n_unique) {
increment_potential:
info->n_hash_potential++;
return;
}
cmp = ut_pair_cmp(info->n_fields, info->n_bytes,
cursor->low_match, cursor->low_bytes);
if (info->left_side ? cmp <= 0 : cmp > 0) {
goto set_new_recomm;
}
cmp = ut_pair_cmp(info->n_fields, info->n_bytes,
cursor->up_match, cursor->up_bytes);
if (info->left_side ? cmp <= 0 : cmp > 0) {
goto increment_potential;
}
set_new_recomm:
/* We have to set a new recommendation; skip the hash analysis
for a while to avoid unnecessary CPU time usage when there is no
chance for success */
info->hash_analysis = 0;
cmp = ut_pair_cmp(cursor->up_match, cursor->up_bytes,
cursor->low_match, cursor->low_bytes);
if (cmp == 0) {
info->n_hash_potential = 0;
/* For extra safety, we set some sensible values here */
info->n_fields = 1;
info->n_bytes = 0;
info->left_side = TRUE;
} else if (cmp > 0) {
info->n_hash_potential = 1;
if (cursor->up_match >= n_unique) {
info->n_fields = n_unique;
info->n_bytes = 0;
} else if (cursor->low_match < cursor->up_match) {
info->n_fields = cursor->low_match + 1;
info->n_bytes = 0;
} else {
info->n_fields = cursor->low_match;
info->n_bytes = cursor->low_bytes + 1;
}
info->left_side = TRUE;
} else {
info->n_hash_potential = 1;
if (cursor->low_match >= n_unique) {
info->n_fields = n_unique;
info->n_bytes = 0;
} else if (cursor->low_match > cursor->up_match) {
info->n_fields = cursor->up_match + 1;
info->n_bytes = 0;
} else {
info->n_fields = cursor->up_match;
info->n_bytes = cursor->up_bytes + 1;
}
info->left_side = FALSE;
}
}
/*************************************************************************
Updates the block search info on hash successes. NOTE that info and
block->n_hash_helps, n_fields, n_bytes, side are NOT protected by any
semaphore, to save CPU time! Do not assume the fields are consistent. */
static
ibool
btr_search_update_block_hash_info(
/*==============================*/
/* out: TRUE if building a (new) hash index on
the block is recommended */
btr_search_t* info, /* in: search info */
buf_block_t* block, /* in: buffer block */
btr_cur_t* cursor __attribute__((unused)))
/* in: cursor */
{
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
ut_ad(rw_lock_own(&((buf_block_t*) block)->lock, RW_LOCK_SHARED)
|| rw_lock_own(&((buf_block_t*) block)->lock, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
ut_ad(cursor);
info->last_hash_succ = FALSE;
ut_a(block->magic_n == BUF_BLOCK_MAGIC_N);
ut_ad(info->magic_n == BTR_SEARCH_MAGIC_N);
if ((block->n_hash_helps > 0)
&& (info->n_hash_potential > 0)
&& (block->n_fields == info->n_fields)
&& (block->n_bytes == info->n_bytes)
&& (block->left_side == info->left_side)) {
if ((block->is_hashed)
&& (block->curr_n_fields == info->n_fields)
&& (block->curr_n_bytes == info->n_bytes)
&& (block->curr_left_side == info->left_side)) {
/* The search would presumably have succeeded using
the hash index */
info->last_hash_succ = TRUE;
}
block->n_hash_helps++;
} else {
block->n_hash_helps = 1;
block->n_fields = info->n_fields;
block->n_bytes = info->n_bytes;
block->left_side = info->left_side;
}
#ifdef UNIV_DEBUG
if (cursor->index->table->does_not_fit_in_memory) {
block->n_hash_helps = 0;
}
#endif /* UNIV_DEBUG */
if ((block->n_hash_helps > page_get_n_recs(block->frame)
/ BTR_SEARCH_PAGE_BUILD_LIMIT)
&& (info->n_hash_potential >= BTR_SEARCH_BUILD_LIMIT)) {
if ((!block->is_hashed)
|| (block->n_hash_helps
> 2 * page_get_n_recs(block->frame))
|| (block->n_fields != block->curr_n_fields)
|| (block->n_bytes != block->curr_n_bytes)
|| (block->left_side != block->curr_left_side)) {
/* Build a new hash index on the page */
return(TRUE);
}
}
return(FALSE);
}
/*************************************************************************
Updates a hash node reference when it has been unsuccessfully used in a
search which could have succeeded with the used hash parameters. This can
happen because when building a hash index for a page, we do not check
what happens at page boundaries, and therefore there can be misleading
hash nodes. Also, collisions in the fold value can lead to misleading
references. This function lazily fixes these imperfections in the hash
index. */
static
void
btr_search_update_hash_ref(
/*=======================*/
btr_search_t* info, /* in: search info */
buf_block_t* block, /* in: buffer block where cursor positioned */
btr_cur_t* cursor) /* in: cursor */
{
ulint fold;
rec_t* rec;
dulint index_id;
ut_ad(cursor->flag == BTR_CUR_HASH_FAIL);
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&btr_search_latch, RW_LOCK_EX));
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_SHARED)
|| rw_lock_own(&(block->lock), RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
ut_ad(buf_block_align(btr_cur_get_rec(cursor)) == block);
ut_a(!block->is_hashed || block->index == cursor->index);
if (block->is_hashed
&& (info->n_hash_potential > 0)
&& (block->curr_n_fields == info->n_fields)
&& (block->curr_n_bytes == info->n_bytes)
&& (block->curr_left_side == info->left_side)) {
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
*offsets_ = (sizeof offsets_) / sizeof *offsets_;
rec = btr_cur_get_rec(cursor);
if (!page_rec_is_user_rec(rec)) {
return;
}
index_id = cursor->index->id;
fold = rec_fold(rec,
rec_get_offsets(rec, cursor->index, offsets_,
ULINT_UNDEFINED, &heap),
block->curr_n_fields,
block->curr_n_bytes, index_id);
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&btr_search_latch, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
ha_insert_for_fold(btr_search_sys->hash_index, fold, rec);
}
}
/*************************************************************************
Updates the search info. */
void
btr_search_info_update_slow(
/*========================*/
btr_search_t* info, /* in/out: search info */
btr_cur_t* cursor) /* in: cursor which was just positioned */
{
buf_block_t* block;
ibool build_index;
ulint* params;
ulint* params2;
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
block = buf_block_align(btr_cur_get_rec(cursor));
/* NOTE that the following two function calls do NOT protect
info or block->n_fields etc. with any semaphore, to save CPU time!
We cannot assume the fields are consistent when we return from
those functions! */
btr_search_info_update_hash(info, cursor);
build_index = btr_search_update_block_hash_info(info, block, cursor);
if (build_index || (cursor->flag == BTR_CUR_HASH_FAIL)) {
btr_search_check_free_space_in_heap();
}
if (cursor->flag == BTR_CUR_HASH_FAIL) {
/* Update the hash node reference, if appropriate */
#ifdef UNIV_SEARCH_PERF_STAT
btr_search_n_hash_fail++;
#endif /* UNIV_SEARCH_PERF_STAT */
rw_lock_x_lock(&btr_search_latch);
btr_search_update_hash_ref(info, block, cursor);
rw_lock_x_unlock(&btr_search_latch);
}
if (build_index) {
/* Note that since we did not protect block->n_fields etc.
with any semaphore, the values can be inconsistent. We have
to check inside the function call that they make sense. We
also malloc an array and store the values there to make sure
the compiler does not let the function call parameters change
inside the called function. It might be that the compiler
would optimize the call just to pass pointers to block. */
params = mem_alloc(3 * sizeof(ulint));
params[0] = block->n_fields;
params[1] = block->n_bytes;
params[2] = block->left_side;
/* Make sure the compiler cannot deduce the values and do
optimizations */
params2 = params + btr_search_this_is_zero;
btr_search_build_page_hash_index(cursor->index,
block->frame,
params2[0],
params2[1],
params2[2]);
mem_free(params);
}
}
/**********************************************************************
Checks if a guessed position for a tree cursor is right. Note that if
mode is PAGE_CUR_LE, which is used in inserts, and the function returns
TRUE, then cursor->up_match and cursor->low_match both have sensible values. */
static
ibool
btr_search_check_guess(
/*===================*/
/* out: TRUE if success */
btr_cur_t* cursor, /* in: guessed cursor position */
ibool can_only_compare_to_cursor_rec,
/* in: if we do not have a latch on the page
of cursor, but only a latch on
btr_search_latch, then ONLY the columns
of the record UNDER the cursor are
protected, not the next or previous record
in the chain: we cannot look at the next or
previous record to check our guess! */
dtuple_t* tuple, /* in: data tuple */
ulint mode, /* in: PAGE_CUR_L, PAGE_CUR_LE, PAGE_CUR_G,
or PAGE_CUR_GE */
mtr_t* mtr) /* in: mtr */
{
rec_t* rec;
ulint n_unique;
ulint match;
ulint bytes;
int cmp;
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
ulint* offsets = offsets_;
ibool success = FALSE;
*offsets_ = (sizeof offsets_) / sizeof *offsets_;
n_unique = dict_index_get_n_unique_in_tree(cursor->index);
rec = btr_cur_get_rec(cursor);
ut_ad(page_rec_is_user_rec(rec));
match = 0;
bytes = 0;
offsets = rec_get_offsets(rec, cursor->index, offsets,
n_unique, &heap);
cmp = page_cmp_dtuple_rec_with_match(tuple, rec,
offsets, &match, &bytes);
if (mode == PAGE_CUR_GE) {
if (cmp == 1) {
goto exit_func;
}
cursor->up_match = match;
if (match >= n_unique) {
success = TRUE;
goto exit_func;
}
} else if (mode == PAGE_CUR_LE) {
if (cmp == -1) {
goto exit_func;
}
cursor->low_match = match;
} else if (mode == PAGE_CUR_G) {
if (cmp != -1) {
goto exit_func;
}
} else if (mode == PAGE_CUR_L) {
if (cmp != 1) {
goto exit_func;
}
}
if (can_only_compare_to_cursor_rec) {
/* Since we could not determine if our guess is right just by
looking at the record under the cursor, return FALSE */
goto exit_func;
}
match = 0;
bytes = 0;
if ((mode == PAGE_CUR_G) || (mode == PAGE_CUR_GE)) {
rec_t* prev_rec;
ut_ad(!page_rec_is_infimum(rec));
prev_rec = page_rec_get_prev(rec);
if (page_rec_is_infimum(prev_rec)) {
success = btr_page_get_prev(
buf_frame_align(prev_rec), mtr) == FIL_NULL;
goto exit_func;
}
offsets = rec_get_offsets(prev_rec, cursor->index, offsets,
n_unique, &heap);
cmp = page_cmp_dtuple_rec_with_match(tuple, prev_rec,
offsets, &match, &bytes);
if (mode == PAGE_CUR_GE) {
success = cmp == 1;
} else {
success = cmp != -1;
}
goto exit_func;
} else {
rec_t* next_rec;
ut_ad(!page_rec_is_supremum(rec));
next_rec = page_rec_get_next(rec);
if (page_rec_is_supremum(next_rec)) {
if (btr_page_get_next(
buf_frame_align(next_rec), mtr)
== FIL_NULL) {
cursor->up_match = 0;
success = TRUE;
}
goto exit_func;
}
offsets = rec_get_offsets(next_rec, cursor->index, offsets,
n_unique, &heap);
cmp = page_cmp_dtuple_rec_with_match(tuple, next_rec,
offsets, &match, &bytes);
if (mode == PAGE_CUR_LE) {
success = cmp == -1;
cursor->up_match = match;
} else {
success = cmp != 1;
}
}
exit_func:
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
return(success);
}
/**********************************************************************
Tries to guess the right search position based on the hash search info
of the index. Note that if mode is PAGE_CUR_LE, which is used in inserts,
and the function returns TRUE, then cursor->up_match and cursor->low_match
both have sensible values. */
ibool
btr_search_guess_on_hash(
/*=====================*/
/* out: TRUE if succeeded */
dict_index_t* index, /* in: index */
btr_search_t* info, /* in: index search info */
dtuple_t* tuple, /* in: logical record */
ulint mode, /* in: PAGE_CUR_L, ... */
ulint latch_mode, /* in: BTR_SEARCH_LEAF, ...;
NOTE that only if has_search_latch
is 0, we will have a latch set on
the cursor page, otherwise we assume
the caller uses his search latch
to protect the record! */
btr_cur_t* cursor, /* out: tree cursor */
ulint has_search_latch,/* in: latch mode the caller
currently has on btr_search_latch:
RW_S_LATCH, RW_X_LATCH, or 0 */
mtr_t* mtr) /* in: mtr */
{
buf_block_t* block;
rec_t* rec;
page_t* page;
ulint fold;
ulint tuple_n_fields;
dulint index_id;
ibool can_only_compare_to_cursor_rec = TRUE;
#ifdef notdefined
btr_cur_t cursor2;
btr_pcur_t pcur;
#endif
ut_ad(index && info && tuple && cursor && mtr);
ut_ad((latch_mode == BTR_SEARCH_LEAF)
|| (latch_mode == BTR_MODIFY_LEAF));
/* Note that, for efficiency, the struct info may not be protected by
any latch here! */
if (UNIV_UNLIKELY(info->n_hash_potential == 0)) {
return(FALSE);
}
cursor->n_fields = info->n_fields;
cursor->n_bytes = info->n_bytes;
tuple_n_fields = dtuple_get_n_fields(tuple);
if (UNIV_UNLIKELY(tuple_n_fields < cursor->n_fields)) {
return(FALSE);
}
if (UNIV_UNLIKELY(tuple_n_fields == cursor->n_fields)
&& (cursor->n_bytes > 0)) {
return(FALSE);
}
index_id = index->id;
#ifdef UNIV_SEARCH_PERF_STAT
info->n_hash_succ++;
#endif
fold = dtuple_fold(tuple, cursor->n_fields, cursor->n_bytes, index_id);
cursor->fold = fold;
cursor->flag = BTR_CUR_HASH;
if (UNIV_LIKELY(!has_search_latch)) {
rw_lock_s_lock(&btr_search_latch);
}
ut_ad(btr_search_latch.writer != RW_LOCK_EX);
ut_ad(btr_search_latch.reader_count > 0);
rec = ha_search_and_get_data(btr_search_sys->hash_index, fold);
if (UNIV_UNLIKELY(!rec)) {
goto failure_unlock;
}
page = buf_frame_align(rec);
if (UNIV_LIKELY(!has_search_latch)) {
if (UNIV_UNLIKELY(
!buf_page_get_known_nowait(latch_mode, page,
BUF_MAKE_YOUNG,
__FILE__, __LINE__,
mtr))) {
goto failure_unlock;
}
rw_lock_s_unlock(&btr_search_latch);
can_only_compare_to_cursor_rec = FALSE;
#ifdef UNIV_SYNC_DEBUG
buf_page_dbg_add_level(page, SYNC_TREE_NODE_FROM_HASH);
#endif /* UNIV_SYNC_DEBUG */
}
block = buf_block_align(page);
if (UNIV_UNLIKELY(block->state == BUF_BLOCK_REMOVE_HASH)) {
if (UNIV_LIKELY(!has_search_latch)) {
btr_leaf_page_release(page, latch_mode, mtr);
}
goto failure;
}
ut_ad(block->state == BUF_BLOCK_FILE_PAGE);
ut_ad(page_rec_is_user_rec(rec));
btr_cur_position(index, rec, cursor);
/* Check the validity of the guess within the page */
/* If we only have the latch on btr_search_latch, not on the
page, it only protects the columns of the record the cursor
is positioned on. We cannot look at the next of the previous
record to determine if our guess for the cursor position is
right. */
if (UNIV_EXPECT(
ut_dulint_cmp(index_id, btr_page_get_index_id(page)), 0)
|| !btr_search_check_guess(cursor,
can_only_compare_to_cursor_rec,
tuple, mode, mtr)) {
if (UNIV_LIKELY(!has_search_latch)) {
btr_leaf_page_release(page, latch_mode, mtr);
}
goto failure;
}
if (UNIV_LIKELY(info->n_hash_potential < BTR_SEARCH_BUILD_LIMIT + 5)) {
info->n_hash_potential++;
}
#ifdef notdefined
/* These lines of code can be used in a debug version to check
the correctness of the searched cursor position: */
info->last_hash_succ = FALSE;
/* Currently, does not work if the following fails: */
ut_ad(!has_search_latch);
btr_leaf_page_release(page, latch_mode, mtr);
btr_cur_search_to_nth_level(index, 0, tuple, mode, latch_mode,
&cursor2, 0, mtr);
if (mode == PAGE_CUR_GE
&& page_rec_is_supremum(btr_cur_get_rec(&cursor2))) {
/* If mode is PAGE_CUR_GE, then the binary search
in the index tree may actually take us to the supremum
of the previous page */
info->last_hash_succ = FALSE;
btr_pcur_open_on_user_rec(index, tuple, mode, latch_mode,
&pcur, mtr);
ut_ad(btr_pcur_get_rec(&pcur) == btr_cur_get_rec(cursor));
} else {
ut_ad(btr_cur_get_rec(&cursor2) == btr_cur_get_rec(cursor));
}
/* NOTE that it is theoretically possible that the above assertions
fail if the page of the cursor gets removed from the buffer pool
meanwhile! Thus it might not be a bug. */
#endif
info->last_hash_succ = TRUE;
#ifdef UNIV_SEARCH_PERF_STAT
btr_search_n_succ++;
#endif
if (UNIV_LIKELY(!has_search_latch)
&& buf_block_peek_if_too_old(block)) {
buf_page_make_young(page);
}
/* Increment the page get statistics though we did not really
fix the page: for user info only */
buf_pool->n_page_gets++;
return(TRUE);
/*-------------------------------------------*/
failure_unlock:
if (UNIV_LIKELY(!has_search_latch)) {
rw_lock_s_unlock(&btr_search_latch);
}
failure:
cursor->flag = BTR_CUR_HASH_FAIL;
#ifdef UNIV_SEARCH_PERF_STAT
info->n_hash_fail++;
if (info->n_hash_succ > 0) {
info->n_hash_succ--;
}
#endif
info->last_hash_succ = FALSE;
return(FALSE);
}
/************************************************************************
Drops a page hash index. */
void
btr_search_drop_page_hash_index(
/*============================*/
page_t* page) /* in: index page, s- or x-latched, or an index page
for which we know that block->buf_fix_count == 0 */
{
hash_table_t* table;
buf_block_t* block;
ulint n_fields;
ulint n_bytes;
rec_t* rec;
ulint fold;
ulint prev_fold;
dulint index_id;
ulint n_cached;
ulint n_recs;
ulint* folds;
ulint i;
mem_heap_t* heap;
dict_index_t* index;
ulint* offsets;
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
retry:
rw_lock_s_lock(&btr_search_latch);
block = buf_block_align(page);
if (UNIV_LIKELY(!block->is_hashed)) {
rw_lock_s_unlock(&btr_search_latch);
return;
}
table = btr_search_sys->hash_index;
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_SHARED)
|| rw_lock_own(&(block->lock), RW_LOCK_EX)
|| (block->buf_fix_count == 0));
#endif /* UNIV_SYNC_DEBUG */
n_fields = block->curr_n_fields;
n_bytes = block->curr_n_bytes;
index = block->index;
/* NOTE: The fields of block must not be accessed after
releasing btr_search_latch, as the index page might only
be s-latched! */
rw_lock_s_unlock(&btr_search_latch);
ut_a(n_fields + n_bytes > 0);
n_recs = page_get_n_recs(page);
/* Calculate and cache fold values into an array for fast deletion
from the hash index */
folds = mem_alloc(n_recs * sizeof(ulint));
n_cached = 0;
rec = page_get_infimum_rec(page);
rec = page_rec_get_next(rec);
index_id = btr_page_get_index_id(page);
ut_a(0 == ut_dulint_cmp(index_id, index->id));
prev_fold = 0;
heap = NULL;
offsets = NULL;
while (!page_rec_is_supremum(rec)) {
offsets = rec_get_offsets(rec, index, offsets,
n_fields + (n_bytes > 0), &heap);
ut_a(rec_offs_n_fields(offsets) == n_fields + (n_bytes > 0));
fold = rec_fold(rec, offsets, n_fields, n_bytes, index_id);
if (fold == prev_fold && prev_fold != 0) {
goto next_rec;
}
/* Remove all hash nodes pointing to this page from the
hash chain */
folds[n_cached] = fold;
n_cached++;
next_rec:
rec = page_rec_get_next(rec);
prev_fold = fold;
}
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
rw_lock_x_lock(&btr_search_latch);
if (UNIV_UNLIKELY(!block->is_hashed)) {
/* Someone else has meanwhile dropped the hash index */
goto cleanup;
}
ut_a(block->index == index);
if (UNIV_UNLIKELY(block->curr_n_fields != n_fields)
|| UNIV_UNLIKELY(block->curr_n_bytes != n_bytes)) {
/* Someone else has meanwhile built a new hash index on the
page, with different parameters */
rw_lock_x_unlock(&btr_search_latch);
mem_free(folds);
goto retry;
}
for (i = 0; i < n_cached; i++) {
ha_remove_all_nodes_to_page(table, folds[i], page);
}
block->is_hashed = FALSE;
block->index = NULL;
cleanup:
if (UNIV_UNLIKELY(block->n_pointers)) {
/* Corruption */
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Corruption of adaptive hash index."
" After dropping\n"
"InnoDB: the hash index to a page of %s,"
" still %lu hash nodes remain.\n",
index->name, (ulong) block->n_pointers);
rw_lock_x_unlock(&btr_search_latch);
btr_search_validate();
} else {
rw_lock_x_unlock(&btr_search_latch);
}
mem_free(folds);
}
/************************************************************************
Drops a page hash index when a page is freed from a fseg to the file system.
Drops possible hash index if the page happens to be in the buffer pool. */
void
btr_search_drop_page_hash_when_freed(
/*=================================*/
ulint space, /* in: space id */
ulint page_no) /* in: page number */
{
ibool is_hashed;
page_t* page;
mtr_t mtr;
is_hashed = buf_page_peek_if_search_hashed(space, page_no);
if (!is_hashed) {
return;
}
mtr_start(&mtr);
/* We assume that if the caller has a latch on the page, then the
caller has already dropped the hash index for the page, and we never
get here. Therefore we can acquire the s-latch to the page without
having to fear a deadlock. */
page = buf_page_get_gen(space, page_no, RW_S_LATCH, NULL,
BUF_GET_IF_IN_POOL, __FILE__, __LINE__,
&mtr);
#ifdef UNIV_SYNC_DEBUG
buf_page_dbg_add_level(page, SYNC_TREE_NODE_FROM_HASH);
#endif /* UNIV_SYNC_DEBUG */
btr_search_drop_page_hash_index(page);
mtr_commit(&mtr);
}
/************************************************************************
Builds a hash index on a page with the given parameters. If the page already
has a hash index with different parameters, the old hash index is removed.
If index is non-NULL, this function checks if n_fields and n_bytes are
sensible values, and does not build a hash index if not. */
static
void
btr_search_build_page_hash_index(
/*=============================*/
dict_index_t* index, /* in: index for which to build */
page_t* page, /* in: index page, s- or x-latched */
ulint n_fields,/* in: hash this many full fields */
ulint n_bytes,/* in: hash this many bytes from the next
field */
ibool left_side)/* in: hash for searches from left side? */
{
hash_table_t* table;
buf_block_t* block;
rec_t* rec;
rec_t* next_rec;
ulint fold;
ulint next_fold;
dulint index_id;
ulint n_cached;
ulint n_recs;
ulint* folds;
rec_t** recs;
ulint i;
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
ulint* offsets = offsets_;
*offsets_ = (sizeof offsets_) / sizeof *offsets_;
ut_ad(index);
block = buf_block_align(page);
table = btr_search_sys->hash_index;
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_SHARED)
|| rw_lock_own(&(block->lock), RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
rw_lock_s_lock(&btr_search_latch);
if (block->is_hashed && ((block->curr_n_fields != n_fields)
|| (block->curr_n_bytes != n_bytes)
|| (block->curr_left_side != left_side))) {
rw_lock_s_unlock(&btr_search_latch);
btr_search_drop_page_hash_index(page);
} else {
rw_lock_s_unlock(&btr_search_latch);
}
n_recs = page_get_n_recs(page);
if (n_recs == 0) {
return;
}
/* Check that the values for hash index build are sensible */
if (n_fields + n_bytes == 0) {
return;
}
if (dict_index_get_n_unique_in_tree(index) < n_fields
|| (dict_index_get_n_unique_in_tree(index) == n_fields
&& n_bytes > 0)) {
return;
}
/* Calculate and cache fold values and corresponding records into
an array for fast insertion to the hash index */
folds = mem_alloc(n_recs * sizeof(ulint));
recs = mem_alloc(n_recs * sizeof(rec_t*));
n_cached = 0;
index_id = btr_page_get_index_id(page);
rec = page_get_infimum_rec(page);
rec = page_rec_get_next(rec);
offsets = rec_get_offsets(rec, index, offsets,
n_fields + (n_bytes > 0), &heap);
if (!page_rec_is_supremum(rec)) {
ut_a(n_fields <= rec_offs_n_fields(offsets));
if (n_bytes > 0) {
ut_a(n_fields < rec_offs_n_fields(offsets));
}
}
fold = rec_fold(rec, offsets, n_fields, n_bytes, index_id);
if (left_side) {
folds[n_cached] = fold;
recs[n_cached] = rec;
n_cached++;
}
for (;;) {
next_rec = page_rec_get_next(rec);
if (page_rec_is_supremum(next_rec)) {
if (!left_side) {
folds[n_cached] = fold;
recs[n_cached] = rec;
n_cached++;
}
break;
}
offsets = rec_get_offsets(next_rec, index, offsets,
n_fields + (n_bytes > 0), &heap);
next_fold = rec_fold(next_rec, offsets, n_fields,
n_bytes, index_id);
if (fold != next_fold) {
/* Insert an entry into the hash index */
if (left_side) {
folds[n_cached] = next_fold;
recs[n_cached] = next_rec;
n_cached++;
} else {
folds[n_cached] = fold;
recs[n_cached] = rec;
n_cached++;
}
}
rec = next_rec;
fold = next_fold;
}
btr_search_check_free_space_in_heap();
rw_lock_x_lock(&btr_search_latch);
if (block->is_hashed && ((block->curr_n_fields != n_fields)
|| (block->curr_n_bytes != n_bytes)
|| (block->curr_left_side != left_side))) {
goto exit_func;
}
block->is_hashed = TRUE;
block->n_hash_helps = 0;
block->curr_n_fields = n_fields;
block->curr_n_bytes = n_bytes;
block->curr_left_side = left_side;
block->index = index;
for (i = 0; i < n_cached; i++) {
ha_insert_for_fold(table, folds[i], recs[i]);
}
exit_func:
rw_lock_x_unlock(&btr_search_latch);
mem_free(folds);
mem_free(recs);
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
}
/************************************************************************
Moves or deletes hash entries for moved records. If new_page is already hashed,
then the hash index for page, if any, is dropped. If new_page is not hashed,
and page is hashed, then a new hash index is built to new_page with the same
parameters as page (this often happens when a page is split). */
void
btr_search_move_or_delete_hash_entries(
/*===================================*/
page_t* new_page, /* in: records are copied
to this page */
page_t* page, /* in: index page from which
records were copied, and the
copied records will be deleted
from this page */
dict_index_t* index) /* in: record descriptor */
{
buf_block_t* block;
buf_block_t* new_block;
ulint n_fields;
ulint n_bytes;
ibool left_side;
block = buf_block_align(page);
new_block = buf_block_align(new_page);
ut_a(page_is_comp(page) == page_is_comp(new_page));
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_EX));
ut_ad(rw_lock_own(&(new_block->lock), RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
ut_a(!new_block->is_hashed || new_block->index == index);
ut_a(!block->is_hashed || block->index == index);
rw_lock_s_lock(&btr_search_latch);
if (new_block->is_hashed) {
rw_lock_s_unlock(&btr_search_latch);
btr_search_drop_page_hash_index(page);
return;
}
if (block->is_hashed) {
n_fields = block->curr_n_fields;
n_bytes = block->curr_n_bytes;
left_side = block->curr_left_side;
new_block->n_fields = block->curr_n_fields;
new_block->n_bytes = block->curr_n_bytes;
new_block->left_side = left_side;
rw_lock_s_unlock(&btr_search_latch);
ut_a(n_fields + n_bytes > 0);
btr_search_build_page_hash_index(index, new_page, n_fields,
n_bytes, left_side);
#if 1 /* TODO: safe to remove? */
ut_a(n_fields == block->curr_n_fields);
ut_a(n_bytes == block->curr_n_bytes);
ut_a(left_side == block->curr_left_side);
#endif
return;
}
rw_lock_s_unlock(&btr_search_latch);
}
/************************************************************************
Updates the page hash index when a single record is deleted from a page. */
void
btr_search_update_hash_on_delete(
/*=============================*/
btr_cur_t* cursor) /* in: cursor which was positioned on the
record to delete using btr_cur_search_...,
the record is not yet deleted */
{
hash_table_t* table;
buf_block_t* block;
rec_t* rec;
ulint fold;
dulint index_id;
ibool found;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
mem_heap_t* heap = NULL;
*offsets_ = (sizeof offsets_) / sizeof *offsets_;
rec = btr_cur_get_rec(cursor);
block = buf_block_align(rec);
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
if (!block->is_hashed) {
return;
}
ut_a(block->index == cursor->index);
ut_a(block->curr_n_fields + block->curr_n_bytes > 0);
table = btr_search_sys->hash_index;
index_id = cursor->index->id;
fold = rec_fold(rec, rec_get_offsets(rec, cursor->index, offsets_,
ULINT_UNDEFINED, &heap),
block->curr_n_fields, block->curr_n_bytes, index_id);
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
rw_lock_x_lock(&btr_search_latch);
found = ha_search_and_delete_if_found(table, fold, rec);
rw_lock_x_unlock(&btr_search_latch);
}
/************************************************************************
Updates the page hash index when a single record is inserted on a page. */
void
btr_search_update_hash_node_on_insert(
/*==================================*/
btr_cur_t* cursor) /* in: cursor which was positioned to the
place to insert using btr_cur_search_...,
and the new record has been inserted next
to the cursor */
{
hash_table_t* table;
buf_block_t* block;
rec_t* rec;
rec = btr_cur_get_rec(cursor);
block = buf_block_align(rec);
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
if (!block->is_hashed) {
return;
}
ut_a(block->index == cursor->index);
rw_lock_x_lock(&btr_search_latch);
if ((cursor->flag == BTR_CUR_HASH)
&& (cursor->n_fields == block->curr_n_fields)
&& (cursor->n_bytes == block->curr_n_bytes)
&& !block->curr_left_side) {
table = btr_search_sys->hash_index;
ha_search_and_update_if_found(table, cursor->fold, rec,
page_rec_get_next(rec));
rw_lock_x_unlock(&btr_search_latch);
} else {
rw_lock_x_unlock(&btr_search_latch);
btr_search_update_hash_on_insert(cursor);
}
}
/************************************************************************
Updates the page hash index when a single record is inserted on a page. */
void
btr_search_update_hash_on_insert(
/*=============================*/
btr_cur_t* cursor) /* in: cursor which was positioned to the
place to insert using btr_cur_search_...,
and the new record has been inserted next
to the cursor */
{
hash_table_t* table;
buf_block_t* block;
rec_t* rec;
rec_t* ins_rec;
rec_t* next_rec;
dulint index_id;
ulint fold;
ulint ins_fold;
ulint next_fold = 0; /* remove warning (??? bug ???) */
ulint n_fields;
ulint n_bytes;
ibool left_side;
ibool locked = FALSE;
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
ulint* offsets = offsets_;
*offsets_ = (sizeof offsets_) / sizeof *offsets_;
table = btr_search_sys->hash_index;
btr_search_check_free_space_in_heap();
rec = btr_cur_get_rec(cursor);
block = buf_block_align(rec);
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&(block->lock), RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
if (!block->is_hashed) {
return;
}
ut_a(block->index == cursor->index);
index_id = cursor->index->id;
n_fields = block->curr_n_fields;
n_bytes = block->curr_n_bytes;
left_side = block->curr_left_side;
ins_rec = page_rec_get_next(rec);
next_rec = page_rec_get_next(ins_rec);
offsets = rec_get_offsets(ins_rec, cursor->index, offsets,
ULINT_UNDEFINED, &heap);
ins_fold = rec_fold(ins_rec, offsets, n_fields, n_bytes, index_id);
if (!page_rec_is_supremum(next_rec)) {
offsets = rec_get_offsets(next_rec, cursor->index, offsets,
n_fields + (n_bytes > 0), &heap);
next_fold = rec_fold(next_rec, offsets, n_fields,
n_bytes, index_id);
}
if (!page_rec_is_infimum(rec)) {
offsets = rec_get_offsets(rec, cursor->index, offsets,
n_fields + (n_bytes > 0), &heap);
fold = rec_fold(rec, offsets, n_fields, n_bytes, index_id);
} else {
if (left_side) {
rw_lock_x_lock(&btr_search_latch);
locked = TRUE;
ha_insert_for_fold(table, ins_fold, ins_rec);
}
goto check_next_rec;
}
if (fold != ins_fold) {
if (!locked) {
rw_lock_x_lock(&btr_search_latch);
locked = TRUE;
}
if (!left_side) {
ha_insert_for_fold(table, fold, rec);
} else {
ha_insert_for_fold(table, ins_fold, ins_rec);
}
}
check_next_rec:
if (page_rec_is_supremum(next_rec)) {
if (!left_side) {
if (!locked) {
rw_lock_x_lock(&btr_search_latch);
locked = TRUE;
}
ha_insert_for_fold(table, ins_fold, ins_rec);
}
goto function_exit;
}
if (ins_fold != next_fold) {
if (!locked) {
rw_lock_x_lock(&btr_search_latch);
locked = TRUE;
}
if (!left_side) {
ha_insert_for_fold(table, ins_fold, ins_rec);
/*
fputs("Hash insert for ", stderr);
dict_index_name_print(stderr, cursor->index);
fprintf(stderr, " fold %lu\n", ins_fold);
*/
} else {
ha_insert_for_fold(table, next_fold, next_rec);
}
}
function_exit:
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
if (locked) {
rw_lock_x_unlock(&btr_search_latch);
}
}
/************************************************************************
Validates the search system. */
ibool
btr_search_validate(void)
/*=====================*/
/* out: TRUE if ok */
{
buf_block_t* block;
page_t* page;
ha_node_t* node;
ulint n_page_dumps = 0;
ibool ok = TRUE;
ulint i;
ulint cell_count;
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
ulint* offsets = offsets_;
/* How many cells to check before temporarily releasing
btr_search_latch. */
ulint chunk_size = 10000;
*offsets_ = (sizeof offsets_) / sizeof *offsets_;
rw_lock_x_lock(&btr_search_latch);
cell_count = hash_get_n_cells(btr_search_sys->hash_index);
for (i = 0; i < cell_count; i++) {
/* We release btr_search_latch every once in a while to
give other queries a chance to run. */
if ((i != 0) && ((i % chunk_size) == 0)) {
rw_lock_x_unlock(&btr_search_latch);
os_thread_yield();
rw_lock_x_lock(&btr_search_latch);
}
node = hash_get_nth_cell(btr_search_sys->hash_index, i)->node;
while (node != NULL) {
block = buf_block_align(node->data);
page = buf_frame_align(node->data);
offsets = rec_get_offsets((rec_t*) node->data,
block->index, offsets,
block->curr_n_fields
+ (block->curr_n_bytes > 0),
&heap);
if (!block->is_hashed || node->fold
!= rec_fold((rec_t*)(node->data),
offsets,
block->curr_n_fields,
block->curr_n_bytes,
btr_page_get_index_id(page))) {
ok = FALSE;
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Error in an adaptive hash"
" index pointer to page %lu\n"
"InnoDB: ptr mem address %p"
" index id %lu %lu,"
" node fold %lu, rec fold %lu\n",
(ulong) buf_frame_get_page_no(page),
node->data,
(ulong) ut_dulint_get_high(
btr_page_get_index_id(page)),
(ulong) ut_dulint_get_low(
btr_page_get_index_id(page)),
(ulong) node->fold,
(ulong) rec_fold((rec_t*)(node->data),
offsets,
block->curr_n_fields,
block->curr_n_bytes,
btr_page_get_index_id(
page)));
fputs("InnoDB: Record ", stderr);
rec_print_new(stderr, (rec_t*)node->data,
offsets);
fprintf(stderr, "\nInnoDB: on that page."
" Page mem address %p, is hashed %lu,"
" n fields %lu, n bytes %lu\n"
"InnoDB: side %lu\n",
(void*) page, (ulong) block->is_hashed,
(ulong) block->curr_n_fields,
(ulong) block->curr_n_bytes,
(ulong) block->curr_left_side);
if (n_page_dumps < 20) {
buf_page_print(page);
n_page_dumps++;
}
}
node = node->next;
}
}
for (i = 0; i < cell_count; i += chunk_size) {
ulint end_index = ut_min(i + chunk_size - 1, cell_count - 1);
/* We release btr_search_latch every once in a while to
give other queries a chance to run. */
if (i != 0) {
rw_lock_x_unlock(&btr_search_latch);
os_thread_yield();
rw_lock_x_lock(&btr_search_latch);
}
if (!ha_validate(btr_search_sys->hash_index, i, end_index)) {
ok = FALSE;
}
}
rw_lock_x_unlock(&btr_search_latch);
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
return(ok);
}
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