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https://issues.apache.org/jira/browse/HDFS-7784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15795396#comment-15795396
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Kihwal Lee commented on HDFS-7784:
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[~xiegang112], when you have a chance to test the performance, please also
share the jvm GC setting and the hardware spec (e.g. how many cores, as it
affects the GC performance). It will be even better if you can measure the GC
activities before and after. If everything looks positive, people will
certainly be interested.
> load fsimage in parallel
> ------------------------
>
> Key: HDFS-7784
> URL: https://issues.apache.org/jira/browse/HDFS-7784
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Walter Su
> Assignee: Walter Su
> Priority: Minor
> Labels: BB2015-05-TBR
> Attachments: HDFS-7784.001.patch, test-20150213.pdf
>
>
> When single Namenode has huge amount of files, without using federation, the
> startup/restart speed is slow. The fsimage loading step takes the most of the
> time. fsimage loading can seperate to two parts, deserialization and object
> construction(mostly map insertion). Deserialization takes the most of CPU
> time. So we can do deserialization in parallel, and add to hashmap in serial.
> It will significantly reduce the NN start time.
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