saintstack commented on issue #739: HBASE-23157 WAL unflushed seqId tracking 
may wrong when Durability.AS…
URL: https://github.com/apache/hbase/pull/739#issuecomment-545720071
 
 
   Thanks for bringing up the " indicates a last flushed sequence id" message 
on the master. Good one. It is related. At least for the HBASE-23181 case, it 
makes sense because an entry goes into SequenceIdAccounting with a sequenceid 
that is one less than the flush sequenceid (somehow it is getting in after the 
flush the flush).  Once it goes in, the Master starts complaining.
   
   You added a whole new flushcache method to HRegion in 
TestMaxFlushedSeqId.patch. How is it different from the original? The test 
looks good. What do you see as the output? You can make it so a flush gets a 
sequenceid that is less than the last edit's sequenceid? The last edit does not 
make it into the flush? Its out of order?
   
   Nice work.

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