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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3693) QJM: JNStorage should read its storage info even before a writer becomes active
Date Tue, 24 Jul 2012 19:13:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421671#comment-13421671
] 

Aaron T. Myers commented on HDFS-3693:
--------------------------------------

One tiny nit, you might want to put a space after ":" here:
{code}
System.err.println("storage string:" + storageString);
{code}

Otherwise the patch looks good to me. +1.
                
> 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
>         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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