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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3693) QJM: JNStorage should read its storage info even before a writer becomes active
Date Fri, 20 Jul 2012 00:50:34 GMT
Todd Lipcon created HDFS-3693:
---------------------------------

             Summary: QJM: JNStorage should read its storage info even before a writer becomes
active
                 Key: HDFS-3693
                 URL: https://issues.apache.org/jira/browse/HDFS-3693
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Minor


In order for QJM to work with HA, the standby needs to be able to read from a JournalNode
even when no active has written to it. In the current code, it reads the StorageInfo only
when {{newEpoch()}} is called. But, that's only called when a writer becomes active. This
causes the SBN to fail at startup since the JN thinks its storage info is uninitialized.

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