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MDEV-15826 Purge attempts to free BLOB page after BEGIN;INSERT;UPDATE;ROLLBACK

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- During rollback, redo segments priorities over no-redo rollback
segments and it leads to failure of redo rollback segment undo
logs truncation.
This commit is contained in:
Thirunarayanan Balathandayuthapani 2018-04-18 12:39:39 +05:30
parent 1d98333ad9
commit 341edddc3d
3 changed files with 46 additions and 10 deletions
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13
mysql-test/suite/innodb/r/undo_log.result
View file

@ -140,3 +140,16 @@ CHECK TABLE test_tab;
Table Op Msg_type Msg_text
test.test_tab check status OK
DROP TABLE test_tab;
SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
CREATE TEMPORARY TABLE t2(i INT)ENGINE=InnoDB;
CREATE TABLE t1(i TEXT NOT NULL) ENGINE=INNODB;
BEGIN;
INSERT t1 SET i=REPEAT('1234567890',840);
UPDATE t1 SET i='';
INSERT INTO t2 VALUES(2);
ROLLBACK;
InnoDB 0 transactions not purged
DROP TABLE t1;
DROP TABLE t2;
SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;

14
mysql-test/suite/innodb/t/undo_log.test
View file

@ -137,3 +137,17 @@ ROLLBACK;
SELECT COUNT(*) FROM test_tab;
CHECK TABLE test_tab;
DROP TABLE test_tab;
SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
CREATE TEMPORARY TABLE t2(i INT)ENGINE=InnoDB;
CREATE TABLE t1(i TEXT NOT NULL) ENGINE=INNODB;
BEGIN;
INSERT t1 SET i=REPEAT('1234567890',840);
UPDATE t1 SET i='';
INSERT INTO t2 VALUES(2);
ROLLBACK;
--source include/wait_all_purged.inc
DROP TABLE t1;
DROP TABLE t2;
SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;

29
storage/innobase/trx/trx0roll.cc
View file

@ -1003,7 +1003,7 @@ trx_roll_pop_top_rec_of_trx(trx_t* trx, roll_ptr_t* roll_ptr, mem_heap_t* heap)
trx_roll_try_truncate(trx);
}
trx_undo_t* undo;
trx_undo_t* undo = NULL;
trx_undo_t* insert = trx->rsegs.m_redo.insert_undo;
trx_undo_t* update = trx->rsegs.m_redo.update_undo;
trx_undo_t* temp = trx->rsegs.m_noredo.undo;
@ -1017,17 +1017,26 @@ trx_roll_pop_top_rec_of_trx(trx_t* trx, roll_ptr_t* roll_ptr, mem_heap_t* heap)
|| update->top_undo_no != temp->top_undo_no);
if (insert && !insert->empty && limit <= insert->top_undo_no) {
if (update && !update->empty
&& update->top_undo_no > insert->top_undo_no) {
undo = insert;
}
if (update && !update->empty && update->top_undo_no >= limit) {
if (!undo) {
undo = update;
} else if (undo->top_undo_no < update->top_undo_no) {
undo = update;
} else {
undo = insert;
}
} else if (update && !update->empty && limit <= update->top_undo_no) {
undo = update;
} else if (temp && !temp->empty && limit <= temp->top_undo_no) {
undo = temp;
} else {
}
if (temp && !temp->empty && temp->top_undo_no >= limit) {
if (!undo) {
undo = temp;
} else if (undo->top_undo_no < temp->top_undo_no) {
undo = temp;
}
}
if (undo == NULL) {
trx_roll_try_truncate(trx);
/* Mark any ROLLBACK TO SAVEPOINT completed, so that
if the transaction object is committed and reused