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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1541) Not marking datanodes dead When namenode in safemode
Date Thu, 17 Mar 2011 23:56:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008231#comment-13008231
] 

Matt Foley commented on HDFS-1541:
----------------------------------

Great!  Thanks, Hairong.  This is key for making startup faster for big clusters.

> Not marking datanodes dead When namenode in safemode
> ----------------------------------------------------
>
>                 Key: HDFS-1541
>                 URL: https://issues.apache.org/jira/browse/HDFS-1541
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.23.0
>
>         Attachments: deadnodescheck.patch, deadnodescheck1.patch
>
>
> In a big cluster, when namenode starts up,  it takes a long time for namenode to process
block reports from all datanodes. Because heartbeats processing get delayed, some datanodes
are erroneously marked as dead, then later on they have to register again, thus wasting time.
> It would speed up starting time if the checking of dead nodes is disabled when namenode
in safemode.

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