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https://issues.apache.org/jira/browse/HADOOP-803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12463789
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Raghu Angadi commented on HADOOP-803:
-------------------------------------
Modified containingNodes to be ArrayList instead of sortedSet. On a lightly
loaded 500 node cluster (each node has 500-600 blocks), with the patch memory
(in MB) was low to mid 40s after GC and with out the patch memory was in mid
50s. I will submit a new 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
> 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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