[jira] [Resolved] (HDFS-3870) QJM: add metrics to JournalNode

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HDFS-3870.
-------------------------------

       Resolution: Fixed
    Fix Version/s: QuorumJournalManager (HDFS-3077)
     Hadoop Flags: Reviewed

Committed to branch, thanks for the review.
                
> QJM: add metrics to JournalNode
> -------------------------------
>
>                 Key: HDFS-3870
>                 URL: https://issues.apache.org/jira/browse/HDFS-3870
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: QuorumJournalManager (HDFS-3077)
>
>         Attachments: hdfs-3870.txt
>
>
> The JournalNode should expose some basic metrics through the usual interface. In particular:
> - the writer epoch, accepted epoch,
> - the last written transaction ID and last committed txid (which may be newer in case that it's in the process of catching up)
> - latency information for how long the syncs are taking
> Please feel free to suggest others that come to mind.

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