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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, 21 Dec 2006 23:21:23 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-803?page=comments#action_12460365 ] 
Raghu Angadi commented on HADOOP-803:

The attached patch seems to save in the order of 1MB with around 3000 blocks (9000 total blocks/3).
Without the patch Jconsole show  around 5.3-5.57 MB of heap in use just after GC.  With the
patch it is around 4.4-4.8 MB. Calculation would be more accurate on a larger cluster. I will

> Reducing memory consumption on Namenode : Part 1
> ------------------------------------------------
>                 Key: HADOOP-803
>                 URL: http://issues.apache.org/jira/browse/HADOOP-803
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Raghu Angadi
>         Assigned To: Raghu Angadi
>         Attachments: block-refs-2.patch, block-refs-3.patch, block-refs-5.patch
> 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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