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From "Lisheng Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13694) Making md5 computing being in parallel with image loading
Date Sat, 06 Jul 2019 01:54:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16879580#comment-16879580
] 

Lisheng Sun commented on HDFS-13694:
------------------------------------

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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