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Date: Wed, 8 Feb 2012 02:01:00 +0000 (UTC)
From: "Uma Maheswara Rao G (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-2362) More Improvements on NameNode
 Scalability
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    [ https://issues.apache.org/jira/browse/HDFS-2362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203133#comment-13203133 ] 

Uma Maheswara Rao G commented on HDFS-2362:
-------------------------------------------

Ok, Thanks Eli.
                
> 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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