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Commit 457ce97e authored by Marko Mäkelä's avatar Marko Mäkelä
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MDEV-21512 InnoDB may hang due to SPATIAL INDEX 

MySQL 5.7.29 includes the following fix:
Bug #30287668 INNODB: A LONG SEMAPHORE WAIT
mysql/mysql-server@5cdbb22b51cf2b35dbdf5666a251ffbec2f84dec

There is no test case. It seems that the problem could occur when
a spatial index is large and peculiar enough so that multiple R-tree
leaf pages will have the exactly same maximum bounding rectangle (MBR).

The commit message suggests that the hang can occur when R-tree
non-leaf pages are being merged, which should only be possible
during transaction rollback or the purge of transaction history,
when the R-tree index is at least 2 levels high and very many records
are being deleted. The message says that a comparison result that two
spatial index node pointer records are equal will cause an infinite loop
in rtr_page_copy_rec_list_end_no_locks(). Hence, we must include the
child page number in the comparison to be consistent with
mysql/mysql-server@2e11fe0e152e34d73579e1a9ec19aedc3f6010f6.

We fix this bug in a simpler way, involving fewer code changes.

cmp_rec_rec(): Renamed from cmp_rec_rec_with_match().
Assert that rec2 always resides in an index page.
Treat non-leaf spatial index pages specially.
parent c3695b40
Show whitespace changes
Inline Side-by-side
Showing with 87 additions and 138 deletions
storage/innobase/btr/btr0cur.cc
View file @ 457ce97e
......@@ -1826,8 +1826,8 @@ btr_cur_search_to_nth_level(
offsets2 = rec_get_offsets(
first_rec, index, offsets2,
false, ULINT_UNDEFINED, &heap);
cmp_rec_rec_with_match(node_ptr, first_rec,
offsets, offsets2, index, FALSE,
cmp_rec_rec(node_ptr, first_rec,
offsets, offsets2, index, false,
&matched_fields);
if (matched_fields
......@@ -1844,10 +1844,10 @@ btr_cur_search_to_nth_level(
offsets2 = rec_get_offsets(
last_rec, index, offsets2,
false, ULINT_UNDEFINED, &heap);
cmp_rec_rec_with_match(
cmp_rec_rec(
node_ptr, last_rec,
offsets, offsets2, index,
FALSE, &matched_fields);
false, &matched_fields);
if (matched_fields
>= rec_offs_n_fields(offsets) - 1) {
detected_same_key_root = true;
......@@ -6307,7 +6307,7 @@ btr_estimate_number_of_different_key_vals(
ULINT_UNDEFINED,
&heap);
cmp_rec_rec_with_match(rec, next_rec,
cmp_rec_rec(rec, next_rec,
offsets_rec, offsets_next_rec,
index, stats_null_not_equal,
&matched_fields);
......
storage/innobase/dict/dict0stats.cc
View file @ 457ce97e
/*****************************************************************************
Copyright (c) 2009, 2019, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2015, 2019, MariaDB Corporation.
Copyright (c) 2015, 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
......@@ -1166,13 +1166,9 @@ dict_stats_analyze_index_level(
prev_rec, index, prev_rec_offsets, !level,
n_uniq, &heap);
cmp_rec_rec_with_match(rec,
prev_rec,
rec_offsets,
prev_rec_offsets,
index,
FALSE,
&matched_fields);
cmp_rec_rec(prev_rec, rec,
prev_rec_offsets, rec_offsets, index,
false, &matched_fields);
for (i = matched_fields; i < n_uniq; i++) {
......@@ -1392,9 +1388,8 @@ dict_stats_scan_page(
/* check whether rec != next_rec when looking at
the first n_prefix fields */
cmp_rec_rec_with_match(rec, next_rec,
offsets_rec, offsets_next_rec,
index, FALSE, &matched_fields);
cmp_rec_rec(rec, next_rec, offsets_rec, offsets_next_rec,
index, false, &matched_fields);
if (matched_fields < n_prefix) {
/* rec != next_rec, => rec is non-boring */
......
storage/innobase/gis/gis0rtree.cc
View file @ 457ce97e
/*****************************************************************************
Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2019, MariaDB Corporation.
Copyright (c) 2019, 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
......@@ -1449,9 +1449,8 @@ rtr_page_copy_rec_list_end_no_locks(
offsets2 = rec_get_offsets(cur_rec, index, offsets2,
is_leaf,
ULINT_UNDEFINED, &heap);
cmp = cmp_rec_rec_with_match(cur1_rec, cur_rec,
offsets1, offsets2,
index, FALSE,
cmp = cmp_rec_rec(cur1_rec, cur_rec,
offsets1, offsets2, index, false,
&cur_matched_fields);
if (cmp < 0) {
page_cur_move_to_prev(&page_cur);
......@@ -1564,14 +1563,12 @@ rtr_page_copy_rec_list_start_no_locks(
while (!page_rec_is_supremum(cur_rec)) {
ulint cur_matched_fields = 0;
int cmp;
offsets2 = rec_get_offsets(cur_rec, index, offsets2,
is_leaf,
ULINT_UNDEFINED, &heap);
cmp = cmp_rec_rec_with_match(cur1_rec, cur_rec,
offsets1, offsets2,
index, FALSE,
int cmp = cmp_rec_rec(cur1_rec, cur_rec,
offsets1, offsets2, index, false,
&cur_matched_fields);
if (cmp < 0) {
page_cur_move_to_prev(&page_cur);
......
storage/innobase/include/rem0cmp.h
View file @ 457ce97e
/*****************************************************************************
Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, MariaDB Corporation.
Copyright (c) 2017, 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
......@@ -80,7 +80,7 @@ cmp_dfield_dfield(
/** Compare a GIS data tuple to a physical record.
@param[in] dtuple data tuple
@param[in] rec B-tree record
@param[in] rec R-tree record
@param[in] offsets rec_get_offsets(rec)
@param[in] mode compare mode
@retval negative if dtuple is less than rec */
......@@ -190,43 +190,23 @@ cmp_rec_rec_simple(
duplicate key value if applicable,
or NULL */
MY_ATTRIBUTE((nonnull(1,2,3,4), warn_unused_result));
/** Compare two B-tree records.
@param[in] rec1 B-tree record
@param[in] rec2 B-tree record
@param[in] offsets1 rec_get_offsets(rec1, index)
@param[in] offsets2 rec_get_offsets(rec2, index)
@param[in] index B-tree index
@param[in] nulls_unequal true if this is for index cardinality
statistics estimation, and innodb_stats_method=nulls_unequal
or innodb_stats_method=nulls_ignored
@param[out] matched_fields number of completely matched fields
within the first field not completely matched
@return the comparison result
@retval 0 if rec1 is equal to rec2
@retval negative if rec1 is less than rec2
@retval positive if rec2 is greater than rec2 */
int
cmp_rec_rec_with_match(
const rec_t* rec1,
const rec_t* rec2,
const offset_t* offsets1,
const offset_t* offsets2,
const dict_index_t* index,
bool nulls_unequal,
ulint* matched_fields);
/** Compare two B-tree records.
/** Compare two B-tree or R-tree records.
Only the common first fields are compared, and externally stored field
are treated as equal.
@param[in] rec1 B-tree record
@param[in] rec2 B-tree record
@param[in] rec1 record (possibly not on an index page)
@param[in] rec2 B-tree or R-tree record in an index page
@param[in] offsets1 rec_get_offsets(rec1, index)
@param[in] offsets2 rec_get_offsets(rec2, index)
@param[in] nulls_unequal true if this is for index cardinality
statistics estimation with
innodb_stats_method=nulls_unequal
or innodb_stats_method=nulls_ignored
@param[out] matched_fields number of completely matched fields
within the first field not completely matched
@return positive, 0, negative if rec1 is greater, equal, less, than rec2,
respectively */
UNIV_INLINE
@retval 0 if rec1 is equal to rec2
@retval negative if rec1 is less than rec2
@retval positive if rec1 is greater than rec2 */
int
cmp_rec_rec(
const rec_t* rec1,
......@@ -234,7 +214,9 @@ cmp_rec_rec(
const offset_t* offsets1,
const offset_t* offsets2,
const dict_index_t* index,
ulint* matched_fields = NULL);
bool nulls_unequal = false,
ulint* matched_fields = NULL)
MY_ATTRIBUTE((nonnull(1,2,3,4,5)));
/** Compare two data fields.
@param[in] dfield1 data field
......
storage/innobase/include/rem0cmp.ic
View file @ 457ce97e
/*****************************************************************************
Copyright (c) 1994, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
......@@ -52,40 +53,6 @@ cmp_dfield_dfield(
dfield_get_len(dfield2)));
}
/** Compare two B-tree records.
Only the common first fields are compared, and externally stored field
are treated as equal.
@param[in] rec1 B-tree record
@param[in] rec2 B-tree record
@param[in] offsets1 rec_get_offsets(rec1, index)
@param[in] offsets2 rec_get_offsets(rec2, index)
@param[out] matched_fields number of completely matched fields
within the first field not completely matched
@return positive, 0, negative if rec1 is greater, equal, less, than rec2,
respectively */
UNIV_INLINE
int
cmp_rec_rec(
const rec_t* rec1,
const rec_t* rec2,
const offset_t* offsets1,
const offset_t* offsets2,
const dict_index_t* index,
ulint* matched_fields)
{
ulint match_f;
int ret;
ret = cmp_rec_rec_with_match(
rec1, rec2, offsets1, offsets2, index, false, &match_f);
if (matched_fields != NULL) {
*matched_fields = match_f;
}
return(ret);
}
/** Compare two data fields.
@param[in] dfield1 data field
@param[in] dfield2 data field
......
storage/innobase/rem/rem0cmp.cc
View file @ 457ce97e
/*****************************************************************************
Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 1994, 2019, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
......@@ -25,6 +26,7 @@ Created 7/1/1994 Heikki Tuuri
#include "rem0cmp.h"
#include "rem0rec.h"
#include "page0page.h"
#include "dict0mem.h"
#include "handler0alter.h"
......@@ -534,7 +536,7 @@ cmp_data(
/** Compare a GIS data tuple to a physical record.
@param[in] dtuple data tuple
@param[in] rec B-tree record
@param[in] rec R-tree record
@param[in] offsets rec_get_offsets(rec)
@param[in] mode compare mode
@retval negative if dtuple is less than rec */
......@@ -1086,23 +1088,24 @@ cmp_rec_rec_simple(
return(0);
}
/** Compare two B-tree records.
@param[in] rec1 B-tree record
@param[in] rec2 B-tree record
/** Compare two B-tree or R-tree records.
Only the common first fields are compared, and externally stored field
are treated as equal.
@param[in] rec1 record (possibly not on an index page)
@param[in] rec2 B-tree or R-tree record in an index page
@param[in] offsets1 rec_get_offsets(rec1, index)
@param[in] offsets2 rec_get_offsets(rec2, index)
@param[in] index B-tree index
@param[in] nulls_unequal true if this is for index cardinality
statistics estimation, and innodb_stats_method=nulls_unequal
or innodb_stats_method=nulls_ignored
statistics estimation with
innodb_stats_method=nulls_unequal
or innodb_stats_method=nulls_ignored
@param[out] matched_fields number of completely matched fields
within the first field not completely matched
@return the comparison result
within the first field not completely matched
@retval 0 if rec1 is equal to rec2
@retval negative if rec1 is less than rec2
@retval positive if rec2 is greater than rec2 */
@retval positive if rec1 is greater than rec2 */
int
cmp_rec_rec_with_match(
cmp_rec_rec(
const rec_t* rec1,
const rec_t* rec2,
const offset_t* offsets1,
......@@ -1111,17 +1114,14 @@ cmp_rec_rec_with_match(
bool nulls_unequal,
ulint* matched_fields)
{
ulint rec1_n_fields; /* the number of fields in rec */
ulint rec1_f_len; /* length of current field in rec */
const byte* rec1_b_ptr; /* pointer to the current byte
in rec field */
ulint rec2_n_fields; /* the number of fields in rec */
ulint rec2_f_len; /* length of current field in rec */
const byte* rec2_b_ptr; /* pointer to the current byte
in rec field */
ulint cur_field = 0; /* current field number */
int ret = 0; /* return value */
ulint comp;
ut_ad(rec1 != NULL);
ut_ad(rec2 != NULL);
......@@ -1129,10 +1129,12 @@ cmp_rec_rec_with_match(
ut_ad(rec_offs_validate(rec1, index, offsets1));
ut_ad(rec_offs_validate(rec2, index, offsets2));
ut_ad(rec_offs_comp(offsets1) == rec_offs_comp(offsets2));
ut_ad(fil_page_index_page_check(page_align(rec2)));
ut_ad(!!dict_index_is_spatial(index)
== (fil_page_get_type(page_align(rec2)) == FIL_PAGE_RTREE));
comp = rec_offs_comp(offsets1);
rec1_n_fields = rec_offs_n_fields(offsets1);
rec2_n_fields = rec_offs_n_fields(offsets2);
ulint comp = rec_offs_comp(offsets1);
ulint n_fields;
/* Test if rec is the predefined minimum record */
if (UNIV_UNLIKELY(rec_get_info_bits(rec1, comp)
......@@ -1149,37 +1151,41 @@ cmp_rec_rec_with_match(
goto order_resolved;
}
/* Match fields in a loop */
/* For non-leaf spatial index records, the
dict_index_get_n_unique_in_tree() does include the child page
number, because spatial index node pointers only contain
the MBR (minimum bounding rectangle) and the child page number.
for (; cur_field < rec1_n_fields && cur_field < rec2_n_fields;
cur_field++) {
For B-tree node pointers, the key alone (secondary index
columns and PRIMARY KEY columns) must be unique, and there is
no need to compare the child page number. */
n_fields = std::min(rec_offs_n_fields(offsets1),
rec_offs_n_fields(offsets2));
n_fields = std::min(n_fields, dict_index_get_n_unique_in_tree(index));
for (; cur_field < n_fields; cur_field++) {
ulint mtype;
ulint prtype;
/* If this is node-ptr records then avoid comparing node-ptr
field. Only key field needs to be compared. */
if (cur_field == dict_index_get_n_unique_in_tree(index)) {
break;
}
if (dict_index_is_ibuf(index)) {
if (UNIV_UNLIKELY(dict_index_is_ibuf(index))) {
/* This is for the insert buffer B-tree. */
mtype = DATA_BINARY;
prtype = 0;
} else {
const dict_col_t* col;
col = dict_index_get_nth_col(index, cur_field);
const dict_col_t* col = dict_index_get_nth_col(
index, cur_field);
mtype = col->mtype;
prtype = col->prtype;
/* If the index is spatial index, we mark the
prtype of the first field as MBR field. */
if (cur_field == 0 && dict_index_is_spatial(index)) {
if (UNIV_LIKELY(!dict_index_is_spatial(index))) {
} else if (cur_field == 0) {
ut_ad(DATA_GEOMETRY_MTYPE(mtype));
prtype |= DATA_GIS_MBR;
} else if (!page_rec_is_leaf(rec2)) {
/* Compare the child page number. */
ut_ad(cur_field == 1);
mtype = DATA_SYS_CHILD;
prtype = 0;
}
}
......@@ -1215,8 +1221,10 @@ cmp_rec_rec_with_match(
to the common fields */
ut_ad(ret == 0);
order_resolved:
if (matched_fields) {
*matched_fields = cur_field;
return(ret);
}
return ret;
}
#ifdef UNIV_COMPILE_TEST_FUNCS
......
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