saintstack opened a new pull request #742: HBASE-23181 Blocked WAL archive: 
"LogRoller: Failed to schedule flush of XXXX, because it is not online on us"
URL: https://github.com/apache/hbase/pull/742
 
 
   … of XXXX, because it is not online on us"
   
   Fix is moving a line in HRegion to close a gap that would allow an old
   edit to sneak into the backing SequenceIdAccounting datastructure.
   The below line gets moved up before wal.startCacheFlush:
   
   -        flushOpSeqId = getNextSequenceId(wal);
   
   We change the LogRoller constructor to remove redundant param. It will
   also call the temporary,ugly purge method (To be removed if we've found
   fix...). Because of constructor chagne, need to change also
   TestFailedAppendAndSync, TestWALLockup, TestAsyncFSWAL &
   WALPerformanceEvaluation.java
   
   We add a purge method called when something is wrong to AbstractFSWAL.java
   Need to be removed when 'fix' is in place.
   
   SequenceIdAccounting gets a purge method called when we find lagging
   records.

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