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MDEV-19575 Fixed assert in ma_pagecache

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There was a bug in the page cache that didn't take into account that
another thread could be waiting for a page to be read by read_big_block().
Fixed by releasing all waiters in read_big_block()
This commit is contained in:
Monty 2019-06-26 18:24:04 +03:00
parent f44c687815
commit f48943468f
3 changed files with 60 additions and 1 deletions
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22
mysql-test/suite/s3/alter2.result Normal file
View File

@ -0,0 +1,22 @@
#
# MDEV-19575 Assertion `page_st == 1' failed upon SELECT from S3
# table which is being converted into Aria
#
CREATE TABLE t1 (f INT);
insert into t1 values (1),(2);
ALTER TABLE t1 ENGINE=S3;
select * from t1;
f
1
2
connect con1,localhost,root,,$database;
ALTER TABLE t1 ENGINE=Aria;
connection default;
SELECT * FROM t1;
f
1
2
connection con1;
disconnect con1;
connection default;
DROP TABLE t1;

32
mysql-test/suite/s3/alter2.test Normal file
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@ -0,0 +1,32 @@
--source include/have_s3.inc
--source create_database.inc
--echo #
--echo # MDEV-19575 Assertion `page_st == 1' failed upon SELECT from S3
--echo # table which is being converted into Aria
--echo #
CREATE TABLE t1 (f INT);
insert into t1 values (1),(2);
ALTER TABLE t1 ENGINE=S3;
select * from t1;
--connect (con1,localhost,root,,$database)
--send
ALTER TABLE t1 ENGINE=Aria;
--connection default
SELECT * FROM t1;
# Cleanup
--connection con1
--reap
--disconnect con1
--connection default
DROP TABLE t1;
#
# clean up
#
--source drop_database.inc

7
storage/maria/ma_pagecache.c
View File

@ -2867,6 +2867,9 @@ static my_bool read_big_block(PAGECACHE *pagecache,
remove_reader(block_to_read);
unreg_request(pagecache, block_to_read, 1);
}
/* Signal that all pending requests for this page now can be processed */
if (block->wqueue[COND_FOR_REQUESTED].last_thread)
wqueue_release_queue(&block->wqueue[COND_FOR_REQUESTED]);
DBUG_RETURN(FALSE); // no retry
}
@ -2940,6 +2943,8 @@ static my_bool read_big_block(PAGECACHE *pagecache,
}
if (block->wqueue[COND_FOR_BIG_BLOCK].last_thread)
wqueue_release_queue(&block->wqueue[COND_FOR_BIG_BLOCK]);
if (block->wqueue[COND_FOR_REQUESTED].last_thread)
wqueue_release_queue(&block->wqueue[COND_FOR_REQUESTED]);
DBUG_RETURN(FALSE);
}
@ -3684,7 +3689,7 @@ restart:
if (((block->status & PCBLOCK_ERROR) == 0) && (page_st != PAGE_READ))
{
#ifdef WITH_S3_STORAGE_ENGINE
if (!pagecache->big_block_read)
if (!pagecache->big_block_read || page_st == PAGE_WAIT_TO_BE_READ)
#endif /* WITH_S3_STORAGE_ENGINE */
{
/* The requested page is to be read into the block buffer */