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From "dhruba borthakur (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 05:29:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015764#comment-13015764
] 

dhruba borthakur commented on HDFS-1798:
----------------------------------------

In another ira, it is proposed that the NN completely ignores writing back the image at startup
time. Instead, the next invocation by the SecondaryNameNode will do the job. if that is the
case, then do we still need this jira?

> 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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