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This is a backport of the following commits: commitb4165985c9commit69e88de0fecommit40f4525f43commit656f66def2Now that MDEV-14717 made RENAME TABLE crash-safe within InnoDB, it should be safe to drop the #sql- tables within InnoDB during crash recovery. These tables can be one of two things: (1) #sql-ib related to deferred DROP TABLE (follow-up to MDEV-13407) or to table-rebuilding ALTER TABLE...ALGORITHM=INPLACE (since MDEV-14378, only related to the intermediate copy of a table), (2) #sql- related to the intermediate copy of a table during ALTER TABLE...ALGORITHM=COPY We will not drop tables whose name starts with #sql2, because the server can be killed during an ALGORITHM=COPY operation at a point where the original table was renamed to #sql2 but the finished intermediate copy was not yet renamed from #sql- to the original table name. If an old version of MariaDB Server before 10.2.13 (MDEV-11415) was killed while ALTER TABLE...ALGORITHM=COPY was in progress, after recovery there could be undo log records for some records that were inserted into an intermediate copy of the table. Due to these undo log records, InnoDB would resurrect locks at recovery, and the intermediate table would be locked while we are trying to drop it. This would cause a call to row_rename_table_for_mysql(), either from row_mysql_drop_garbage_tables() or from the rollback of a RENAME operation that was part of the ALTER TABLE. row_rename_table_for_mysql(): Do not attempt to parse FOREIGN KEY constraints when renaming from #sql-something to #sql-something-else, because it does not make any sense. row_drop_table_for_mysql(): When deferring DROP TABLE due to locks, do not rename the table if its name already starts with the #sql- prefix, which is what row_mysql_drop_garbage_tables() uses. Previously, the too strict prefix #sql-ib was used, and some tables were renamed unnecessarily.
22 lines
594 B
Text
22 lines
594 B
Text
--source include/have_innodb.inc
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--source include/have_debug.inc
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--source include/have_debug_sync.inc
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--source include/not_embedded.inc
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FLUSH TABLES;
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LET $datadir= `SELECT @@datadir`;
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CREATE TABLE t1 (a SERIAL, b INT, c INT, d INT) ENGINE=InnoDB;
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INSERT INTO t1 () VALUES ();
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--connect (con1,localhost,root,,test)
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SET DEBUG_SYNC='before_rename_table_commit SIGNAL renamed WAIT_FOR ever';
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--send
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RENAME TABLE t1 TO t2;
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--connection default
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SET DEBUG_SYNC='now WAIT_FOR renamed';
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--let $shutdown_timeout=0
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--source include/restart_mysqld.inc
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--disconnect con1
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SELECT * FROM t1;
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DROP TABLE t1;
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