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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8929) Add a metric to expose the timestamp of the last journal
Date Sat, 05 Sep 2015 02:22:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14731723#comment-14731723
] 

Brahma Reddy Battula commented on HDFS-8929:
--------------------------------------------

[~surendrasingh] thanks for updating the patch..Latest Patch LGTM,[~ajisakaa] do you have
some comments on this latest patch..?

> Add a metric to expose the timestamp of the last journal
> --------------------------------------------------------
>
>                 Key: HDFS-8929
>                 URL: https://issues.apache.org/jira/browse/HDFS-8929
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: journal-node
>            Reporter: Akira AJISAKA
>            Assignee: Surendra Singh Lilhore
>         Attachments: HDFS-8929-001.patch, HDFS-8929-002.patch, HDFS-8929-003.patch
>
>
> If there are three JNs and only one JN is failing to journal, we can detect it by monitoring
the difference of the last written transaction id among JNs from NN WebUI or JN metrics. However,
it's difficult to define the threshold to alert because the increase rate of the number of
transaction depends on how busy the cluster is. Therefore I'd like to propose a metric to
expose the timestamp of the last journal. That way we can easily alert if a JN is failing
to journal for some fixed period.



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