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https://issues.apache.org/jira/browse/HBASE-17407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799188#comment-15799188
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stack commented on HBASE-17407:
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bq. Is it possible to execute WAL truncation based on the values in
SequenceIdAccounting while a flush is on going and between startCacheFlush()
and completeCacheFlush()?
If you mean by WAL truncation, the dropping of WALs, then the answer is NO; we
cannot drop WALs during a flush. Flush takes out a barrier, the closeBarrier in
the WAL subsystem (See AbstractFSWAL...).
> Correct update of maxFlushedSeqId in HRegion
> --------------------------------------------
>
> Key: HBASE-17407
> URL: https://issues.apache.org/jira/browse/HBASE-17407
> Project: HBase
> Issue Type: Bug
> Reporter: Eshcar Hillel
>
> The attribute maxFlushedSeqId in HRegion is used to track the max sequence id
> in the store files and is reported to HMaster. When flushing only part of the
> memstore content this value might be incorrect and may cause data loss.
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