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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3869) QJM: expose non-file journal manager details in web UI
Date Sun, 02 Sep 2012 00:56:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446847#comment-13446847
] 

Eli Collins commented on HDFS-3869:
-----------------------------------

+1  looks great

I'd consider mentioning in a comment above journals that is COW because even though FSEdit*
is synchronized these uses may race with the Web UI (my understanding of why it is now a CopyOnWriteArrayList).
                
> QJM: expose non-file journal manager details in web UI
> ------------------------------------------------------
>
>                 Key: HDFS-3869
>                 URL: https://issues.apache.org/jira/browse/HDFS-3869
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: dir-failed.png, hdfs-3869.txt, hdfs-3869.txt, lagging-jn.png, open-for-read.png,
open-for-write.png
>
>
> Currently, the NN web UI only contains NN storage directories on local disk. It should
also include details about any non-file JournalManagers in use.
> This JIRA targets the QJM branch, but will be useful for BKJM as well.

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