Type:
Priority:
Resolution:
Fixed
Affects Version/s:
10.3(EOL) , 10.4(EOL) , 10.5 , 10.6 , 10.7(EOL) , 10.8(EOL) , 10.9(EOL) , 10.10(EOL)
If the workers of a parallel replica are busy (potentially with long queues), but the SQL thread has no events left to distribute (so it goes idle). Then the next event that comes from the primary will update LMT with its timestamp, even if the workers may be quite far behind.
Proposed fix is for the SQL thread to additionally check if there are uncommitted events. That is, we should add an atomic counter (displayable as a new system status variable), which the SQL thread increments on reads, and that the workers decrement on commits. last_master_timestamp should only be updated by the SQL thread with the MDEV-29639
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MDEV-31749 New test rpl.rpl_parallel_sbm in bb-10.4-MDEV-30619 sporadically fails in various locations (prepatch: lines 100, 177, 184) (postpatch_1: lines 180, 187)
MDEV-31895 Report a Replica's Time Difference with its Primary