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https://issues.apache.org/jira/browse/HDFS-13694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16879580#comment-16879580
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Lisheng Sun commented on HDFS-13694:
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Thank [~elgoiri] for merging this patch.
I think we need to cherry-pick this improvement to all branches. Thanks.
> Making md5 computing being in parallel with image loading
> ---------------------------------------------------------
>
> Key: HDFS-13694
> URL: https://issues.apache.org/jira/browse/HDFS-13694
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: zhouyingchao
> Assignee: Lisheng Sun
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-13694-001.patch, HDFS-13694-002.patch,
> HDFS-13694-003.patch, HDFS-13694-004.patch, HDFS-13694-005.patch,
> HDFS-13694-006.patch, HDFS-13694-007.patch
>
>
> During namenode image loading, it firstly compute the md5 and then load the
> image. Actually these two steps can be in parallel.
> Test this patch against a fsimage of a 70PB 2.4 cluster (200million files
> and 300million blocks), the image loading time be reduced from 1210 seconds
> to 1105 seconds.So it can reduce up to about 10% of time.
>
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