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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6914) Resolve huge memory consumption Issue with OIV processing PB-based fsimages
Date Wed, 24 Sep 2014 20:11:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14146817#comment-14146817
] 

Haohui Mai commented on HDFS-6914:
----------------------------------

[~haoch], do you mind if I take this jira and drive it forward?

> Resolve huge memory consumption Issue with OIV processing PB-based fsimages
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-6914
>                 URL: https://issues.apache.org/jira/browse/HDFS-6914
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.4.1
>            Reporter: Hao Chen
>              Labels: hdfs
>         Attachments: HDFS-6914.patch
>
>
> For better managing and supporting a lot of large hadoop clusters in production, we internally
need to automatically export fsimage to delimited text files in LSR style and then analyse
with hive or pig or build system metrics for real-time analyzing. 
> However  due to the internal layout changes introduced by the protobuf-based fsimage,
OIV processing program consumes excessive amount of memory. For example, in order to export
the fsimage in size of 8GB, it should have taken about 85GB memory which is really not reasonable
and impacted performance of other services badly in the same server.
> To resolve above problem, I submit this patch which will reduce memory consumption of
OIV LSR processing by 50%.



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