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MDEV-34529 Shrink the system tablespace when system tablespace contains MDEV-30671 leaked undo pages

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- InnoDB fails to shrink the system tablespace when it contains
the leaked undo log pages caused by MDEV-30671.

- InnoDB does free the unused segment in system tablespace
before shrinking the tablespace. InnoDB fails to free
the unused segment if XA PREPARE transaction exist or
if the previous shutdown was not with innodb_fast_shutdown=0

inode_info: Structure to store the inode page and offsets.

fil_space_t::garbage_collect(): Frees the system tablespace
unused segment

fsp_get_sys_used_segment(): Iterates through all default
file segment and index segment present in system tablespace.

trx_sys_t::is_xa_exist(): Returns true if the XA transaction
exist in the undo logs

fseg_inode_free(): Frees the extents, fragment pages for the
given index node and ignores any error similar to
trx_purge_free_segment()

trx_sys_t::reset_page(): Retain the TRX_SYS_FSEG_HEADER value
in trx_sys page while resetting the page.
This commit is contained in:
Thirunarayanan Balathandayuthapani
2024-10-16 21:34:24 +05:30
parent 66b8d32b75
commit 4a1ded61a4
20 changed files with 917 additions and 155 deletions
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9
mysql-test/suite/innodb/r/sys_truncate_debug.result
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@ -19,13 +19,20 @@ InnoDB 0 transactions not purged
SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
NAME FILE_SIZE
innodb_system 540016640
# restart: --debug_dbug=+d,shrink_buffer_pool_full
# restart: --debug_dbug=+d,traversal_extent_fail
FOUND 1 /\[Warning\] InnoDB: Cannot shrink the system tablespace/ in mysqld.1.err
SELECT * FROM INFORMATION_SCHEMA.ENGINES
WHERE engine = 'innodb'
AND support IN ('YES', 'DEFAULT', 'ENABLED');
ENGINE SUPPORT COMMENT TRANSACTIONS XA SAVEPOINTS
InnoDB YES Supports transactions, row-level locking, foreign keys and encryption for tables YES YES YES
# restart: --debug_dbug=+d,shrink_buffer_pool_full
FOUND 2 /\[Warning\] InnoDB: Cannot shrink the system tablespace/ in mysqld.1.err
SELECT * FROM INFORMATION_SCHEMA.ENGINES
WHERE engine = 'innodb'
AND support IN ('YES', 'DEFAULT', 'ENABLED');
ENGINE SUPPORT COMMENT TRANSACTIONS XA SAVEPOINTS
InnoDB YES Supports transactions, row-level locking, foreign keys and encryption for tables YES YES YES
# restart: --debug_dbug=+d,mtr_log_max_size
FOUND 1 /\[ERROR\] InnoDB: Cannot shrink the system tablespace/ in mysqld.1.err
SELECT * FROM INFORMATION_SCHEMA.ENGINES