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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4185) Add a metric for number of active leases
Date Fri, 08 May 2015 05:35:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533897#comment-14533897

Vinayakumar B commented on HDFS-4185:

Thanks [~rakeshr] for taking up this issue.

Source changes looks good.
I think current test will just check the API, not the metric via metric system.
It would be better to have a test to verify the metric via metric system. Check {{TestNameNodeMetrics}}

> Add a metric for number of active leases
> ----------------------------------------
>                 Key: HDFS-4185
>                 URL: https://issues.apache.org/jira/browse/HDFS-4185
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 0.23.4, 2.0.2-alpha
>            Reporter: Kihwal Lee
>            Assignee: Rakesh R
>              Labels: BB2015-05-RFC
>         Attachments: HDFS-4185-001.patch, HDFS-4185-002.patch, HDFS-4185-003.patch
> We have seen cases of systematic open file leaks, which could have been detected if we
have a metric that shows number of active leases.

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