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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5167) Add metrics about the NameNode retry cache
Date Fri, 13 Sep 2013 17:06:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13766647#comment-13766647
] 

Jing Zhao commented on HDFS-5167:
---------------------------------

Thanks for working on this, [~ozawa]!

I've tried adding a similar dropping-response support for non-HA case before (by adding my
own InvocationHandler to proxy used by non-HA case), but looks like for that part we need
more hack, and the code became unstable. Since HDFS-5118 is only used for testing retry cache
in HA setup, I guess we do not need to support non-HA case right now.
                
> Add metrics about the NameNode retry cache
> ------------------------------------------
>
>                 Key: HDFS-5167
>                 URL: https://issues.apache.org/jira/browse/HDFS-5167
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, namenode
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Priority: Minor
>         Attachments: HDFS-5167.1.patch, HDFS-5167.2.patch, HDFS-5167.3.patch
>
>
> It will be helpful to have metrics in NameNode about the retry cache, such as the retry
count etc.

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