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MDEV-8617: Multiple galera tests failures with --ps-protocol
In galera cluster, when myisam replication is enabled (wsrep_replicate_myisam=ON), DML statements are replicated in open_tables(). However, in case of prepared statements, for an INSERT, open_tables() gets invoked twice. Once for COM_STMT_PREPARE (to validate and prepare INSERT) and later for COM_STMT_EXECUTE. As a result, the command gets replicated twice. Same happens for REPLACE, UPDATE and DELETE commands. Fixed by adding a check to not replicate during 'prepare' phase. Also changed the order of conditions to make it more efficient. Lastly, in order to support wsrep_dirty_reads, made changes to allow COM_STMT_XXX commands to continue past initial check even when wsrep is not ready.
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Nirbhay Choubey
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Aug 14, 2015
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