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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6764) DN heartbeats may become clumped together
Date Mon, 28 Jul 2014 16:15:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daryn Sharp updated HDFS-6764:
------------------------------

    Attachment: Screen Shot 2014-07-28 at 11.12.06 AM.png

Darker colors are the raw data of heartbeats per 0.5s.  The lighter lines are a rolling 1s
average which makes the rhythmic behavior of the active (light blue) easier to see.

> DN heartbeats may become clumped together
> -----------------------------------------
>
>                 Key: HDFS-6764
>                 URL: https://issues.apache.org/jira/browse/HDFS-6764
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Daryn Sharp
>         Attachments: Screen Shot 2014-07-28 at 11.12.06 AM.png
>
>
> DNs send heartbeats on a fixed schedule based on the last time a heartbeat was sent.
 If the NN takes longer to respond than the heartbeat interval then DNs do not sleep until
the next interval.  Instead, another heartbeat is immediately sent and all DNs begin heartbeating
on the same schedule.



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