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Posted to issues@ratis.apache.org by "Supratim Deka (JIRA)" <ji...@apache.org> on 2019/06/11 09:12:00 UTC

[jira] [Created] (RATIS-587) FinalizeLogSegment should flush the contents of log

Supratim Deka created RATIS-587:
-----------------------------------

             Summary: FinalizeLogSegment should flush the contents of log
                 Key: RATIS-587
                 URL: https://issues.apache.org/jira/browse/RATIS-587
             Project: Ratis
          Issue Type: Bug
          Components: LogService
            Reporter: Supratim Deka


SegmentedRaftLog uses a BufferedWriteChannel for writing the log.
FinalizeLogSegment task is enqueued when a segment fills up. This task closes the channel and does cleanup.

SegmentedRaftLogOutputStream.close() internally invokes BufferedWriteChannel.flush(false)
the false passed to flush indicates not to flush the buffer cache.

This means that the contents of the log file are not persisted on disk. An abrupt power failure could result in loss of committed log entries. 



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