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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2012/07/25 23:48:35 UTC

[jira] [Resolved] (HDFS-3693) QJM: JNStorage should read its storage info even before a writer becomes active

     [ https://issues.apache.org/jira/browse/HDFS-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HDFS-3693.
-------------------------------

       Resolution: Fixed
    Fix Version/s: QuorumJournalManager (HDFS-3077)
     Hadoop Flags: Reviewed

Committed to branch, with nit addressed in the commit. Thanks for reviewing.
                
> 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
>             Fix For: QuorumJournalManager (HDFS-3077)
>
>         Attachments: hdfs-3693.txt
>
>
> 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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