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https://issues.apache.org/jira/browse/HDFS-2362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171582#comment-13171582
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Uma Maheswara Rao G commented on HDFS-2362:
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Can some please merge this improvements to 0.23 versions as well. Because this
introduced a good amount of delta between trunk and 0.23 version. So, we are
not able to do direct merges of some other improvements like HDFS-1765.
> More Improvements on NameNode Scalability
> -----------------------------------------
>
> Key: HDFS-2362
> URL: https://issues.apache.org/jira/browse/HDFS-2362
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Hairong Kuang
>
> This jira acts as an umbrella jira to track all the improvements we've done
> recently to improve Namenode's performance, responsiveness, and hence
> scalability. Those improvements include:
> 1. Incremental block reports (HDFS-395)
> 2. BlockManager.reportDiff optimization for processing block reports
> (HDFS-2477)
> 3. Upgradable lock to allow simutaleous read operation while reportDiff is in
> progress in processing block reports (HDFS-2490)
> 4. More CPU efficient data structure for
> under-replicated/over-replicated/invalidate blocks (HDFS-2476)
> 5. Increase granularity of write operations in ReplicationMonitor thus
> reducing contention for write lock (HDFS-2495)
> 6. Support variable block sizes
> 7. Release RPC handlers while waiting for edit log is synced to disk
> 8. Reduce network traffic pressure to the master rack where NN is located by
> lowering read priority of the replicas on the rack
> 9. A standalone KeepAlive heartbeat thread
> 10. Reduce Multiple traversals of path directory to one for most namespace
> manipulations
> 11. Move logging out of write lock section.
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