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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-1392) Improve namenode scalability by prioritizing datanode heartbeats over block reports
Date Wed, 30 Mar 2011 04:27:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur resolved HDFS-1392.
------------------------------------

    Resolution: Duplicate

duplicate of HDFS-1541

> Improve namenode scalability by prioritizing datanode heartbeats over block reports
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-1392
>                 URL: https://issues.apache.org/jira/browse/HDFS-1392
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> When a namenode restarts, it gets heartbeats followed by a block reports from the datanodes.
The block report processing is heavyweight and can take many many seconds, especially when
the number of blocks in each datanode is large. This causes the namenode to not be able to
process heartbeats in time, thus leading to "lost heartbeats from datanode". The namenode
declares the datanode to be dead and the datanode has to re-send its register/block report
all over again. This is a scalability problem.

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