Type:
Priority:
Resolution:
Fixed
Affects Version/s:
10.2(EOL) , 10.3(EOL) , 10.4(EOL) , 10.5 , 10.6
As InnoDB page compression uses “hole punching,” and it seems like ignored by somehow. mariabackup SST method leaves compressed data from donor to decompressed on joiner node. mariabackup SST not copying compressed files so page compression seems not beneficial in this case.
MariaDB [tt]> show create table t1\G
*************************** 1 . row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` bigint( 20 ) unsigned NOT NULL AUTO_INCREMENT,
`msg` varchar( 100 ) DEFAULT NULL,
UNIQUE KEY `id` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT= 34209256 DEFAULT CHARSET=latin1 `PAGE_COMPRESSED`= 'ON'
1 row in set ( 0.005 sec)
+--------------+------------+------------+
| TABLE_SCHEMA | TABLE_NAME | ROW_FORMAT |
+--------------+------------+------------+
| tt | t1 | Dynamic |
+--------------+------------+------------+
MariaDB [tt]> show global variables like '%compression%' ;
+------------------------------------------+------------------+
| Variable_name | Value |
+------------------------------------------+------------------+
| column_compression_threshold | 100 |
| column_compression_zlib_level | 6 |
| column_compression_zlib_strategy | DEFAULT_STRATEGY |
| column_compression_zlib_wrap | OFF |
| innodb_compression_algorithm | zlib |
| innodb_compression_default | ON |
| innodb_compression_failure_threshold_pct | 5 |
| innodb_compression_level | 1 |
| innodb_compression_pad_pct_max | 50 |
+------------------------------------------+------------------+
9 rows in set ( 0.001 sec)
page compression is enabled. Where size of tablespace file is:
$ ls -lrth /var/lib/mysql/tt/t1.ibd
2 .1G /var/lib/mysql/tt/t1.ibd
$ du -hs --block-size= 1 /var/lib/mysql/tt/t1.ibd
1098792960 /var/lib/mysql/tt/t1.ibd
$ du -hs /var/lib/mysql/tt/t1.ibd
1 .1G /var/lib/mysql/tt/t1.ibd
Now, let's try mariabackup:
mariabackup --backup --target-dir=/home/vagrant/backup/ -u root -p 'xxxx'
.
[ 00 ] 2021 - 05 - 19 20 : 08 : 13 completed OK!
Let's verify backup table t1 tablespace file size again:
$ ls -la /home/vagrant/backup/tt/t1.ibd
-rw-r-----. 1 root root 2231369728 May 19 20 : 08 /home/vagrant/backup/tt/t1.ibd
$ du -hs --block-size= 1 /home/vagrant/backup/tt/t1.ibd
2214154240 /home/vagrant/backup/tt/t1.ibd
$ du -hs /home/vagrant/backup/tt/t1.ibd
2 .1G /home/vagrant/backup/tt/t1.ibd
As per https://dev.mysql.com/doc/refman/5.7/en/innodb-page-compression.html Preserving page compression when moving a page-compressed tablespace file from one host to another requires a utility that preserves sparse files
I think that is related xtrabackup report https://jira.percona.com/browse/PXB-1557
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0.3
0
Bug
Critical
MDEV-22839 ROW_FORMAT=COMPRESSED vs PAGE_COMPRESSION=1 - size comparison
This change looks OK to me. This will add some fallocate() system calls, but only when page_compressed tables are being used.