Added warnings handling #4365
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Added warnings handling #4365
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* Implemented 'SHOW WARNINGS' and 'SHOW COUNT(*) FROM WARNINGS' query handling. * When a query produces warnings, the warning count is now included in the query response. Additionally, a new variable 'mysql-query_cache_with_warnings_support' has been introduced for the query cache feature: * A value of '0' means that if a query execution produces warnings, the resultset will not be saved in the query cache. * A value of '1' indicates that if a query produces warnings, the resultset will be saved in the query cache, but the warning count in that resultset will be set to '0'. ** Note: * Warning handling is dependent on the query digest and 'mysql-query_digests' must be enabled for it to work. * Warnings saved in logfile ['mysql-log_mysql_warnings_enabled'] and the current feature can work in conjunction with each other.
renecannao
requested changes
Oct 29, 2023
…' to 'mysql-query_cache_handle_warnings' * Introduced global variable 'mysql-handle_warnings' to control warning support in ProxySQL * Included 'handling_warnings' flag in the 'mysql_hostgroup_attributes' table (hostgroup_settings). This flag holds top priority and can override the value of the global variable 'mysql_handle_warnings'.
* 'MySQL_Connection::warning_count' will be globally employed for managing multiplexing control and transmitting the warning count to the client * Fixed prepare statement bug: When preparing, if the digest matches, the result set is retrieved from the cache and sent to the client. Note: Currently using 'mysql_warning_count' to retrieve the warning count for prepared statement.
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I'm not in a position to review this, but just wanted to say we tripped over this issue recently and this fix is exactly what we are looking for. So thank you. 🙏 |
… disabled. * Introduced 'ps_type' enum to differentiate between preparing a statement and executing a statement * Fixed issue where the warning count fails to reset when the SET statement generates a warning. * Resolved the issue where the 'server_status' and 'warning count' were not accurately represented in the statement. * Replaced 'mysql_warning_count' with 'mysql_stmt_warning_count' for retrieving the warning count in statements. * Added 'handle_warning' field in hostgroup_attributes TAP test * Updated warnings TAP test
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…ent does not support CLIENT_DEPRECATE_EOF, warning_count will be '0' in intermediate EOF packet. * Suppress the display of warning counts in the "SHOW WARNINGS" statement.
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…d print it in the log. This override will apply to all TAP tests, except when the TAP test is linked with the MySQL client library (LIBMYSQL_HELPER defined). * Avoid closing of same mysql connection twice on error. * Disabled warning count logging on few TAP tests * Enable CLIENT_DEPRECATE_EOF on 20% of total mysql connections
…final # Conflicts: # test/tap/tests/set_testing-240-t.cpp
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Resolves Issue#1751
Summary:
When a query is executed, and it generates a warning, the multiplexing feature is temporarily disabled. The status is set to
'has_warnings'and the'warning_in_hg'is assigned the current host group. If the next query happens to be either'SHOW WARNINGS'or'SHOW COUNT(*) FROM WARNINGS', it will be executed on the host group specified in'warning_in_hg'. However, if any other type of query is executed, multiplexing is re-enabled, and'warning_in_hg'is reset to -1.Changes:
'SHOW WARNINGS'and'SHOW COUNT(*) FROM WARNINGS'query handling.For more granular control, a new variable
'mysql-handle_warnings'and'handling_warnings'flag in the'mysql_hostgroup_attributes'table ('hostgroup_settings') has been introduced to control warnings handling in ProxySQL:'0'means warnings handling is completely disabled.'1'enables warnings handling as described above.Additionally, a new variable
'mysql-query_cache_handle_warnings'has been introduced for the query cache feature:'0'means that if a query execution produces warnings, the resultset will not be saved in the query cache.'1'indicates that if a query produces warnings, the resultset will be saved in the query cache, but the warning count in that result set will be set to'0'.Note:
'mysql-query_digests'must be enabled for it to work.'mysql-log_mysql_warnings_enabled'] and the current feature can work in conjunction with each other.'mysql-query_digests_keep_comment'is enabled, and'SHOW WARNINGS'or'SHOW COUNT(*) FROM WARNINGS'is used with comments.'SELECT @@warning_count'. If this query is executed, multiplexing will be disabled and will remain disabled for that connection.