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