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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4274) RS should periodically ping its HLog pipeline even if no writes are arriving
Date Mon, 29 Aug 2011 06:08:37 GMT
RS should periodically ping its HLog pipeline even if no writes are arriving
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                 Key: HBASE-4274
                 URL: https://issues.apache.org/jira/browse/HBASE-4274
             Project: HBase
          Issue Type: Improvement
          Components: regionserver, wal
    Affects Versions: 0.92.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Critical
             Fix For: 0.92.0


If you restart HDFS underneath HBase, when HBase isn't taking any write load, the region servers
won't "notice" that there's any problem until the next time they take a write, at which point
they will abort (because the pipeline is gone from beneath them). It would be better if they
wrote some garbage to their HLog once every few seconds as a sort of keepalive, so they will
aggressively abort as soon as there's an issue.

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