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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2510) Add HA-related metrics
Date Fri, 10 Feb 2012 12:57:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205418#comment-13205418

Hudson commented on HDFS-2510:

Integrated in Hadoop-Hdfs-HAbranch-build #74 (See [https://builds.apache.org/job/Hadoop-Hdfs-HAbranch-build/74/])
    HDFS-2510. Add HA-related metrics. Contributed by Aaron T. Myers.

atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1242410
Files : 
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/EditLogTailer.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestHAMetrics.java

> Add HA-related metrics
> ----------------------
>                 Key: HDFS-2510
>                 URL: https://issues.apache.org/jira/browse/HDFS-2510
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>             Fix For: HA branch (HDFS-1623)
>         Attachments: HDFS-2510-HDFS-1623.patch, HDFS-2510.HDFS-1623.patch
> Off the top of my head, I can think of:
> NN metrics:
> * A binary metric for active or standby
> * The size of the pending DN message queues
> * A timestamp for when the standby NN last read from shared edit log
> * The difference between highest generation stamp seen from the shared edit log and the
highest generation stamp seen from any DN
> It would probably also be useful to have a DN metric which somehow describes which active/standby
NNs its talking to, e.g. "times since last communicated with standby/active NNs."
> I'm sure there are others as well. Comments strongly encouraged.

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