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From "sam rash (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1350) make datanodes do graceful shutdown
Date Mon, 23 Aug 2010 17:02:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12901483#action_12901483
] 

sam rash commented on HDFS-1350:
--------------------------------

actually sorry, i remember your patch to do this.  I think the rev I'm using internally is
older--i will check 20-append as well. This problem may not appear in 20-append with all the
latest patches.

the question still remains if there is benefit in making the datanode do a clean shutdown
on the DataXceiver threads.  

> make datanodes do graceful shutdown
> -----------------------------------
>
>                 Key: HDFS-1350
>                 URL: https://issues.apache.org/jira/browse/HDFS-1350
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: sam rash
>            Assignee: sam rash
>
> we found that the Datanode doesn't do a graceful shutdown and a block can be corrupted
(data + checksum amounts off)
> we can make the DN do a graceful shutdown in case there are open files. if this presents
a problem to a timely shutdown, we can make a it a parameter of how long to wait for the full
graceful shutdown before just exiting

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