[jira] [Created] (HBASE-9657) Race condition in low replication checking and FSHLog#rollWriter()

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created HBASE-9657:
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             Summary: Race condition in low replication checking and FSHLog#rollWriter()
                 Key: HBASE-9657
                 URL: https://issues.apache.org/jira/browse/HBASE-9657
             Project: HBase
          Issue Type: Bug
            Reporter: Ted Yu
            Assignee: Ted Yu
         Attachments: 9657-v1.txt

In FSHLog#syncer(), we have this comment:
{code}
      // TODO: preserving the old behavior for now, but this check is strange. It's not
      //       protected by any locks here, so for all we know rolling locks might start
      //       as soon as we enter the "if". Is this best-effort optimization check?
      if (!this.logRollRunning) {
        checkLowReplication();
{code}
The implication is that checkLowReplication() may be running when FSHLog#rollWriter() is also running.

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