Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Incomplete
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10.6
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None
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None
Description
See MDEV-6361 for an earlier, closely-related issue.
The INFORMATION_SCHEMA.SYSTEM_VARIABLES table contains a misleading ENUM_VALUE_LIST for INNODB_COMPRESSION_ALGORITHM. It lists algorithms that are (in principle) supported by MariaDB but (in reality) not compiled into this build.
Here is an example on Amazon RDS MariaDB 10.6.11, which is built to support zlib, lzma, and none, but not other compression algorithms:
System variable metadata says that any of the following values are supported: none,zlib,lz4,lzo,lzma,bzip2,snappy
Welcome to the MariaDB monitor. Commands end with ; or \g.
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Your MariaDB connection id is 96
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Server version: 10.6.11-MariaDB-log managed by https://aws.amazon.com/rds/
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Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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MariaDB [(none)]> select * from information_schema.system_variables where variable_name='INNODB_COMPRESSION_ALGORITHM'\G
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*************************** 1. row ***************************
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VARIABLE_NAME: INNODB_COMPRESSION_ALGORITHM
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SESSION_VALUE: NULL
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GLOBAL_VALUE: zlib
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GLOBAL_VALUE_ORIGIN: COMPILE-TIME
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DEFAULT_VALUE: zlib
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VARIABLE_SCOPE: GLOBAL
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VARIABLE_TYPE: ENUM
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VARIABLE_COMMENT: Compression algorithm used on page compression. One of: none, zlib, lz4, lzo, lzma, bzip2, or snappy
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NUMERIC_MIN_VALUE: NULL
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NUMERIC_MAX_VALUE: NULL
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NUMERIC_BLOCK_SIZE: NULL
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ENUM_VALUE_LIST: none,zlib,lz4,lzo,lzma,bzip2,snappy
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READ_ONLY: NO
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COMMAND_LINE_ARGUMENT: OPTIONAL
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GLOBAL_VALUE_PATH: NULL
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1 row in set (0.002 sec)
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But trying to set not-compiled-in values causes an error:
MariaDB [(none)]> set global innodb_compression_algorithm=bzip2;
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ERROR 1231 (42000): Variable 'innodb_compression_algorithm' can't be set to the value of 'bzip2'
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MariaDB [(none)]> set global innodb_compression_algorithm=lzma;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [(none)]> set global innodb_compression_algorithm=zlib;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [(none)]> set global innodb_compression_algorithm=none;
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Query OK, 0 rows affected (0.000 sec)
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—
Problem: The list of "allowed values" are not all allowed. In order to determine the actually allowed values, you have to test them one by one, and see which ones don't error out.
Solution: The code to populate the information_schema metadata tables/views should be updated to list only the allowed values that can actually be set.
Attachments
Issue Links
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