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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-81) Impact in NameNode scalability because heartbeat processing acquires the global lock
Date Wed, 23 Jun 2010 17:32:50 GMT

     [ https://issues.apache.org/jira/browse/HDFS-81?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur resolved HDFS-81.
----------------------------------

    Resolution: Won't Fix

This problem occurs only in old releases and is not present in trunk.

> Impact in NameNode scalability because heartbeat processing acquires the global lock
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-81
>                 URL: https://issues.apache.org/jira/browse/HDFS-81
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: dhruba borthakur
>
> The heartbeat processing code recently got rearranged via HADOOP-3254. This caused the
NameNode heartbeat processing code to acquire the FSNamesystem global lock for every heartbeat
processing. This could impact scalability of the namenode.
> This problem is present in 0.17.x and 0.18.x release only. It is not present in 0.16.x
and on trunk.

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