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https://issues.apache.org/jira/browse/HDFS-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated HDFS-1114:
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Status: Open (was: Patch Available)
Thanks for the detail review, Suresh.
1. BlocksMap.java
done.
2. LightWeightGSet.java
done all except the follwoing.
* remove() - for better readability ...
Implicit else is better the explicit else?
3. TestGSet.java
* In exception tests, ...
Catching specific exceptions but I did not change the messages.
* println should use Log.info instead of System.out.println?
No, print(..) and println(..) work together.
* add some comments to ...
* add some comments to ...
* add comments to ...
Added more some comments.
> Reducing NameNode memory usage by an alternate hash table
> ---------------------------------------------------------
>
> Key: HDFS-1114
> URL: https://issues.apache.org/jira/browse/HDFS-1114
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: GSet20100525.pdf, gset20100608.pdf,
> h1114_20100607.patch, h1114_20100614b.patch, h1114_20100615.patch,
> h1114_20100616b.patch
>
>
> NameNode uses a java.util.HashMap to store BlockInfo objects. When there are
> many blocks in HDFS, this map uses a lot of memory in the NameNode. We may
> optimize the memory usage by a light weight hash table implementation.
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