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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3870) QJM: add metrics to JournalNode
Date Thu, 30 Aug 2012 02:35:07 GMT
Todd Lipcon created HDFS-3870:
---------------------------------

             Summary: QJM: add metrics to JournalNode
                 Key: HDFS-3870
                 URL: https://issues.apache.org/jira/browse/HDFS-3870
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


The JournalNode should expose some basic metrics through the usual interface. In particular:
- the writer epoch, accepted epoch,
- the last written transaction ID and last committed txid (which may be newer in case that
it's in the process of catching up)
- latency information for how long the syncs are taking

Please feel free to suggest others that come to mind.

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