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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3863) QJM: track last "committed" txid
Date Tue, 28 Aug 2012 21:13:08 GMT
Todd Lipcon created HDFS-3863:
---------------------------------

             Summary: QJM: track last "committed" txid
                 Key: HDFS-3863
                 URL: https://issues.apache.org/jira/browse/HDFS-3863
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


Per some discussion with [~stepinto] [here|https://issues.apache.org/jira/browse/HDFS-3077?focusedCommentId=13422579&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13422579],
we should keep track of the "last committed txid" on each JournalNode. Then during any recovery
operation, we can sanity-check that we aren't asked to truncate a log to an earlier transaction.

This is also a necessary step if we want to support reading from in-progress segments in the
future (since we should only allow reads up to the commit point)

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