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Date: Tue, 5 Apr 2011 05:29:05 +0000 (UTC)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1798) saveNamespace should background the
 writing of the FSImage files when in SafeMode
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    [ 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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