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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
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dhruba borthakur commented on HDFS-1798:
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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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