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https://issues.apache.org/jira/browse/HDFS-1798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Foley updated HDFS-1798:
-----------------------------
Assignee: (was: Matt Foley)
This is a complex change, and after HDFS-1071 only saves the time to write one
FSImage, not four.
Suspending work on this for now. Re-evaluate after HDFS-1073 is merged back
and the new performance is benchmarked.
> 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
> Attachments: 1798_asyncSaveNamespace_v1.patch
>
>
> 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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