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Bug#14636528 INNODB CHANGE BUFFERING IS NOT ENTIRELY CRASH-SAFE

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Delete-mark change buffer records when resorting to a pessimistic
delete from the change buffer B-tree. Skip delete-marked records in
the change buffer merge and when estimating whether an operation can
be buffered. Without this fix, we could try to apply the same buffered
changes multiple times if the server was killed at the right moment.

In MySQL 5.5 and later: ibuf_get_volume_buffered_count_func(): Ignore
delete-marked (already processed) records.

ibuf_delete_rec(): Add a crash point before optimistic delete. If the
optimistic delete fails, flag the record processed before
mtr_commit().

ibuf_merge_or_delete_for_page(): Ignore delete-marked (already
processed) records.

Backport to 5.1: Rename btr_cur_del_unmark_for_ibuf() to
btr_cur_set_deleted_flag_for_ibuf() and add a parameter.

rb:1307 approved by Jimmy Yang
This commit is contained in:
Marko Mäkelä 2012-09-19 22:35:38 +03:00
commit 6bbe24e9a0
9 changed files with 86 additions and 31 deletions
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28
storage/innobase/ibuf/ibuf0ibuf.c
View file

@ -2978,7 +2978,7 @@ dump:
/* The records only differ in the delete-mark.
Clear the delete-mark, like we did before
Bug #56680 was fixed. */
btr_cur_del_unmark_for_ibuf(rec, mtr);
btr_cur_set_deleted_flag_for_ibuf(rec, FALSE, mtr);
updated_in_place:
mem_heap_free(heap);
return;
@ -3058,6 +3058,22 @@ ibuf_delete_rec(
ut_ad(ibuf_inside());
#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
if (ibuf_debug == 2) {
/* Inject a fault (crash). We do this before trying
optimistic delete, because a pessimistic delete in the
change buffer would require a larger test case. */
/* Flag the buffered record as processed, to avoid
an assertion failure after crash recovery. */
btr_cur_set_deleted_flag_for_ibuf(
btr_pcur_get_rec(pcur), TRUE, mtr);
mtr_commit(mtr);
log_make_checkpoint_at(ut_dulint_max, TRUE);
DBUG_SUICIDE();
}
#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
success = btr_cur_optimistic_delete(btr_pcur_get_btr_cur(pcur), mtr);
if (success) {
@ -3072,7 +3088,13 @@ ibuf_delete_rec(
return(FALSE);
}
/* We have to resort to a pessimistic delete from ibuf */
/* We have to resort to a pessimistic delete from ibuf.
Delete-mark the record so that it will not be applied again,
in case the server crashes before the pessimistic delete is
made persistent. */
btr_cur_set_deleted_flag_for_ibuf(
btr_pcur_get_rec(pcur), TRUE, mtr);
btr_pcur_store_position(pcur, mtr);
btr_pcur_commit_specify_mtr(pcur, mtr);
@ -3343,7 +3365,7 @@ loop:
fputs("InnoDB: Discarding record\n ", stderr);
rec_print_old(stderr, ibuf_rec);
fputs("\n from the insert buffer!\n\n", stderr);
} else if (page) {
} else if (page && !rec_get_deleted_flag(ibuf_rec, 0)) {
/* Now we have at pcur a record which should be
inserted to the index page; NOTE that the call below
copies pointers to fields in ibuf_rec, and we must