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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1798) saveNamespace should background the writing of the FSImage files when in SafeMode
Date Tue, 05 Apr 2011 16:51:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016013#comment-13016013
] 

Matt Foley commented on HDFS-1798:
----------------------------------

The work proposed here can be done quickly and safely.  Do you have a sense of when the other
one will be done?

> saveNamespace should background the writing of the FSImage files when in SafeMode
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-1798
>                 URL: https://issues.apache.org/jira/browse/HDFS-1798
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Matt Foley
>            Assignee: Matt Foley
>
> Even with parallel writes of the FSImage files (HDFS-1071), large clusters still typically
spend 5 minutes writing the files.  When in SafeMode, it should be safe to background these
writes instead of waiting for them.  To enable this, the namenode must be prevented from leaving
SafeMode until the writes are done.

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