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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9882) Add heartbeatsTotal in Datanode metrics
Date Fri, 04 Mar 2016 04:26:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179292#comment-15179292

Arpit Agarwal commented on HDFS-9882:

Hi [~elgoiri], 

bq.  heartbeats were reporting as running smoothly but the block report processing was actually
getting stuck because of the disk and delaying the heartbeats which wasn't easy to monitor
Do you mean processing commands from the NN was slow because of disk operations? Did you figure
out which disk operations? IIRC we schedule async disk deletions to avoid this exact problem.

> Add heartbeatsTotal in Datanode metrics
> ---------------------------------------
>                 Key: HDFS-9882
>                 URL: https://issues.apache.org/jira/browse/HDFS-9882
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode
>    Affects Versions: 2.7.2
>            Reporter: Hua Liu
>            Assignee: Hua Liu
>            Priority: Minor
>         Attachments: 0001-HDFS-9882.Add-heartbeatsTotal-in-Datanode-metrics.patch, 0002-HDFS-9882.Add-heartbeatsTotal-in-Datanode-metrics.patch
> Heartbeat latency only reflects the time spent on generating reports and sending reports
to NN. When heartbeats are delayed due to processing commands, this latency does not help
investigation. I would like to propose to add another metric counter to show the total time.

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