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From "Koji Noguchi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3272) Reduce redundant copy of Block object in BlocksMap.map hash map
Date Fri, 18 Apr 2008 20:12:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590598#action_12590598
] 

Koji Noguchi commented on HADOOP-3272:
--------------------------------------

You might want to use jmap -histo:live .
Without it, it'll also count the stale objects.  So number differs depending on when the last
fullGC happened.
(-histo:live does the fullGC first to eliminate any stale objects)

> 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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