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Posted to common-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2008/04/18 20:56:21 UTC

[jira] Commented: (HADOOP-3272) Reduce redundant copy of Block object in BlocksMap.map hash map

    [ https://issues.apache.org/jira/browse/HADOOP-3272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590572#action_12590572 ] 

Konstantin Shvachko commented on HADOOP-3272:
---------------------------------------------

The patch is fairly simple, but might have consequences.
I am all for committing it but before we do lets run some benchmarks.
I propose to run TestDFSIO on at least a 100 nodes cluster creating say 400 files with 100 small blocks each simultaneously with the patch an without.
It would be very useful to post jmap -histo outputs for Block and BlockInfo objects before and after the patch is applied.

> Reduce redundant copy of Block object in BlocksMap.map hash map
> ---------------------------------------------------------------
>
>                 Key: HADOOP-3272
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3272
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>         Environment: All
>            Reporter: lohit vijayarenu
>            Assignee: lohit vijayarenu
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3272.patch
>
>
> Looks like we might have redundant copy of Block object as Key for BlocksMap.map hash map. We should restore this to using same object for both Key, Value to save space. 

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