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[HDFS-6698] try to optimize DFSInputStream.getFileLength() - HDFS - [issue]
...HBase prefers to invoke read() serving scan request, and invoke pread() serving get reqeust. Because pread() almost holds no lock.Let's image there's a read() running, because the definition...
http://issues.apache.org/jira/browse/HDFS-6698    Author: Liang Xie, 2014-08-09, 08:10
[expand - 17 more] - Re: [DISCUSS] Migrate from svn to git for source control? - HDFS - [mail # dev]
...In the bylaws, I see this under PMC responsibilities:* Maintaining the project's shared resources, including the codebaserepository, mailing lists, websites.This seems to indicate that the r...
   Author: Andrew Wang, 2014-08-08, 21:03
[HDFS-6722] Display readable last contact time for dead nodes on NN webUI - HDFS - [issue]
...For dead node info on NN webUI, admins want to know when the nodes became dead, to troubleshoot missing block, etc. Currently the webUI displays the last contact as "the unit of seconds sinc...
http://issues.apache.org/jira/browse/HDFS-6722    Author: Ming Ma, 2014-08-08, 16:21
[HDFS-6740] Make FSDataset support adding data volumes dynamically - HDFS - [issue]
...To support volume management in DN (HDFS-1362), it requires FSDatasetImpl to be able to add volumes dynamically during runtime....
http://issues.apache.org/jira/browse/HDFS-6740    Author: Lei, 2014-08-08, 16:21
[HDFS-6772] Get DN storages out of blockContentsStale state faster after NN restarts - HDFS - [issue]
...Here is the non-HA scenario.1. Get HDFS into block-over-replicated situation.2. Restart the NN.3. From NN's point of view, DNs will remain in blockContentsStale==true state for a long time. ...
http://issues.apache.org/jira/browse/HDFS-6772    Author: Ming Ma, 2014-08-08, 16:21
[HDFS-6728] Dynamically add new volumes to DataStorage, formatted if necessary. - HDFS - [issue]
...When dynamically adding a volume to DataStorage, it should prepare the data dir, e.g., formatting if it is empty....
http://issues.apache.org/jira/browse/HDFS-6728    Author: Lei, 2014-08-08, 16:21
[HDFS-6834] Improve the configuration guidance in DFSClient when there are no Codec classes found in configs - HDFS - [issue]
...This is the comment in HADOOP-10886 from Andrew....
http://issues.apache.org/jira/browse/HDFS-6834    Author: Uma Maheswara Rao G, 2014-08-08, 12:36
[HDFS-6735] A minor optimization to avoid pread() be blocked by read() inside the same DFSInputStream - HDFS - [issue]
...In current DFSInputStream impl, there're a couple of coarser-grained locks in read/pread path, and it has became a HBase read latency pain point so far. In HDFS-6698, i made a minor patch ag...
http://issues.apache.org/jira/browse/HDFS-6735    Author: Liang Xie, 2014-08-08, 08:18
[HDFS-6766] optimize ack notify mechanism to avoid thundering herd issue - HDFS - [issue]
...Currently, DFSOutputStream uses wait/notifyAll to coordinate ack receiving and ack waiting, etc..say there're 5 threads(t1,t2,t3,t4,t5) wait for ack seq no: 1,2,3,4,5, once the no. 1 ack arr...
http://issues.apache.org/jira/browse/HDFS-6766    Author: Liang Xie, 2014-08-07, 22:04
[HDFS-6821] Atomicity of multi file operations - HDFS - [issue]
...Looking how HDFS updates the log files in case of chmod –r or chown –r operations. In these operations, HDFS name node seems to update each file separately; consequently the strace of the op...
http://issues.apache.org/jira/browse/HDFS-6821    Author: Samer Al-Kiswany, 2014-08-07, 20:35
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