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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4621) additional logging to help diagnose slow QJM logSync
Date Thu, 21 Mar 2013 01:29:15 GMT
Todd Lipcon created HDFS-4621:

             Summary: additional logging to help diagnose slow QJM logSync
                 Key: HDFS-4621
                 URL: https://issues.apache.org/jira/browse/HDFS-4621
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha
    Affects Versions: 2.0.3-alpha
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Minor

I've been working on diagnosing an issue with a cluster which is seeing slow logSync calls
occasionally to QJM. Adding a few more pieces of logging would help this:
- in the warning messages on the client side leading up to a timeout, include which nodes
have responded and which ones are still pending
- on the server side, when we actually call FileChannel.force, log a warning if the sync takes
longer than 1 second

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