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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-803) Reducing memory consumption on Namenode : Part 1
Date Thu, 08 Feb 2007 20:03:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12471471
] 

Raghu Angadi commented on HADOOP-803:
-------------------------------------

TreeMap<Block, Block> allows us to get the object that was inserted into the map. With
TreeSet we can not get the object that was inserted. This is the base for removing extra block
objects in this patch.



> Reducing memory consumption on Namenode : Part 1
> ------------------------------------------------
>
>                 Key: HADOOP-803
>                 URL: https://issues.apache.org/jira/browse/HADOOP-803
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Raghu Angadi
>         Assigned To: Raghu Angadi
>             Fix For: 0.12.0
>
>         Attachments: block-refs-2.patch, block-refs-3.patch, block-refs-5.patch, HADOOP-803-2.patch,
HADOOP-803.patch, HADOOP-803_3.patch, HADOOP-803_4.patch, NameNodeMemoryHogs.txt
>
>
> There appears to be some places in Namenode that allow reducing memory consumption without
intrusive code or feature changes. This bug is an initial attempt making those changes. Please
include your thoughts as well. 
> One change I am planning to make : 
> Currently one copy of each block exists for each of the replicas and one copy for blockMap.
I think they are all supposed to be same.

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