[jira] [Created] (HDFS-2362) More Improvements on NameNode Scalability

["Hairong Kuang (JIRA)" <ji...@apache.org>]

More Improvements on NameNode Scalability
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                 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. Upgradable lock to allow simutaleous read operation while reportDiff is in progress in processing block reports
3. More CPU efficient data structure for under-replicated/over-replicated/invalidate blocks
4. Increase granularity of write operations in ReplicationMonitor thus reducing contention for write lock
5. Support variable block sizes
6. Release RPC handlers while waiting for edit log is synced to disk
7. Reduce network traffic pressure to the master rack where NN is located by lowering read priority of the replicas on the rack
8. A standalone KeepAlive heartbeat thread
9. Reduce Multiple traversals of path directory to one for most namespace manipulations
10. Move logging out of write lock section.


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