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Problems -------- The slave io thread did not conduct integrity check for a group of row-based events. Specifically it tolerates missed terminal block event that must be flagged with STMT_END. Failure to react on its loss can confuse the applier thread in various ways. Another potential issue was that there were no check of impossible second in row Gtid-log-event while the slave io thread is receiving to be skipped events after reconnect. Fixes ----- The slave io thread is made by this patch to track the rows event STMT_END status. Whenever at next event reading the IO thread finds out that a preceding Rows event did not actually had the flag, an explicit error is issued. Replication can be resumed after the source of failure is eliminated, see a provided test. Note that currently the row-based group integrity check excludes the compressed version 2 Rows events (which are not generated by MariaDB master). Its uncompressed counterpart is manually tested. The 2nd issue is covered to produce an error in case the io thread receives a successive Gtid_log_event while it is post-reconnect skipping.