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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3694) QJM: Fix getEditLogManifest to fetch httpPort if necessary
Date Tue, 24 Jul 2012 19:19:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421677#comment-13421677
] 

Aaron T. Myers commented on HDFS-3694:
--------------------------------------

+1, the patch looks good to me.
                
> QJM: Fix getEditLogManifest to fetch httpPort if necessary
> ----------------------------------------------------------
>
>                 Key: HDFS-3694
>                 URL: https://issues.apache.org/jira/browse/HDFS-3694
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3694.txt
>
>
> This is necessary for QJM to work with HA. When the NNs start up, they start in standby
state and try to read from the JournalNodes. So they call {{getEditLogManifest()}}. But they
don't call {{getJournalInfo}} so the {{httpPort}} field doesn't get filled in. This means
that when they try to actually fetch the remote edits, they fail since they don't know the
JN's HTTP port.

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