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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3899) QJM: Writer-side metrics
Date Fri, 07 Sep 2012 21:40:08 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451012#comment-13451012
] 

Aaron T. Myers commented on HDFS-3899:
--------------------------------------

Patch looks pretty good to me. Just one small comment. +1 otherwise:

# I find this comment kind of confusing, since these metrics are actually being measured and
published on the "client" (NN) side: "The server-side metrics for a journal from the writer's
perspective."
                
> QJM: Writer-side metrics
> ------------------------
>
>                 Key: HDFS-3899
>                 URL: https://issues.apache.org/jira/browse/HDFS-3899
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3899.txt
>
>
> We already have some metrics on the server side (JournalNode) but it's useful to also
gather metrics from the client side (NameNode). This is important in order to monitor that
the client is seeing good performance from the individual JNs, and so that administrators
can set up alerts if any of the JNs has become inaccessible to the NN.

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