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https://issues.apache.org/jira/browse/HDFS-3870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444971#comment-13444971
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Chao Shi commented on HDFS-3870:
--------------------------------
One more: How often a JN is lagging (by counting the number of log syncs whose
last-commited-txid >= firstTxnId). This indicates the JN is running under poor
condition.
> 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
>
> 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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