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