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https://issues.apache.org/jira/browse/HDFS-2126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060310#comment-13060310
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Matt Foley commented on HDFS-2126:
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The intent is to close this umbrella Jira after HDFS-1391 and HDFS-1732 are
committed.
Other ideas for speeding up Namenode startup have been proposed, and in some
cases Jiras opened. We record some of them here for historical interest, but
they are more speculative and may be pursued under other Jiras or other
projects:
* Fully background the FSImage writes when in Safe Mode (HDFS-1798)
* Further optimization of FSImage reads (e.g. HDFS-1366)
* Concurrent FSImage read processing, by splitting the FSImage file into
independently-processable partitions (speculative)
* Improvements for Edits log read processing, similar to the efficiency
improvements obtained for FSImage reads (speculative)
* Concurrent Block Report processing (e.g. HDFS-1667)
* Fully background Termination Scan (taking the improvements of HDFS-1391 to
their maximum)
> Improve Namenode startup time [umbrella task]
> ---------------------------------------------
>
> Key: HDFS-2126
> URL: https://issues.apache.org/jira/browse/HDFS-2126
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.20.2
> Reporter: Matt Foley
>
> This is an umbrella task to group the improvements in Namenode startup
> latency made over the last few months, and track remaining ideas.
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