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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5076) Create http servlets to enable querying NN's last applied transaction ID and most recent checkpoint's transaction ID
Date Tue, 13 Aug 2013 22:54:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-5076:
----------------------------

    Attachment: HDFS-5076.002.patch

Thanks for the comments Suresh! Update the patch: use MxBean instead of new http servlets.

I've verified the new JMX properties in a local cluster. Will add some unit tests later.
                
> Create http servlets to enable querying NN's last applied transaction ID and most recent
checkpoint's transaction ID
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5076
>                 URL: https://issues.apache.org/jira/browse/HDFS-5076
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>            Priority: Minor
>         Attachments: HDFS-5076.001.patch, HDFS-5076.002.patch
>
>
> Currently NameNode already provides RPC calls to get its last applied transaction ID
and most recent checkpoint's transaction ID. It can be helpful to provide servlets to enable
querying these information through http, so that administrators and applications like Ambari
can easily decide if a forced checkpoint by calling saveNamespace is necessary.

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