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[HDFS-6570] add api that enables checking if a user has certain permissions on a file - HDFS - [issue]
...For some of the authorization modes in Hive, the servers in Hive check if a given user has permissions on a certain file or directory. For example, the storage based authorization mode allow...
http://issues.apache.org/jira/browse/HDFS-6570    Author: Thejas M Nair, 2014-08-01, 23:15
[HDFS-6788] Improve synchronization in BPOfferService with read write lock - HDFS - [issue]
...Threads in DN (DataXceiver, PacketResponder, Async disk worker etc) may block at BPOfferService.getBlockPoolId() when calling BPOfferService.checkBlock(), though they are just reading the sa...
http://issues.apache.org/jira/browse/HDFS-6788    Author: Yongjun Zhang, 2014-08-01, 22:52
[HDFS-6803] Documenting DFSClient#DFSInputStream expectations reading and preading in concurrent context - HDFS - [issue]
...Reviews of the patch posted the parent task suggest that we be more explicit about how DFSIS is expected to behave when being read by contending threads. It is also suggested that presumptio...
http://issues.apache.org/jira/browse/HDFS-6803    Author: stack, 2014-08-01, 22:08
[HDFS-6809] Move some Balancer's inner classes to standalone classes - HDFS - [issue]
...Some of the inner classes in Balancer such as MovedBlocks, Matcher, etc. can be moved out as standalone classes so that these classes can be reused by other code such as the new data migrati...
http://issues.apache.org/jira/browse/HDFS-6809    Author: Tsz Wo Nicholas Sze, 2014-08-01, 21:33
[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, 2014-08-01, 21:33
[HDFS-6801] Archival Storage: Add a new data migration tool - HDFS - [issue]
...The tool is similar to Balancer.  It periodic scans the blocks in HDFS and uses path and/or other meta data (e.g. mtime) to determine if a block should be cooled down (i.e. hot => wa...
http://issues.apache.org/jira/browse/HDFS-6801    Author: Tsz Wo Nicholas Sze, 2014-08-01, 21:32
[HDFS-6773] MiniDFSCluster can run dramatically faster - HDFS - [issue]
...The mini cluster is unnecessarily running with durable edit logs.  The following change cut runtime of a single test from ~30s to ~10s.EditLogFileOutputStream.setShouldSkipFsyncForTesti...
http://issues.apache.org/jira/browse/HDFS-6773    Author: Daryn Sharp, 2014-08-01, 20:36
[HDFS-866] libhdfs with gdb got SEGV - HDFS - [issue]
...I'm now trying to integrate HDFS into our server programs using libhdfs.I found that hdfs_write and hdfs_read (sample program in libhdfs directory) got segv with the gdb execution.Without gd...
http://issues.apache.org/jira/browse/HDFS-866    Author: Kazuki Ohta, 2014-08-01, 20:34
[HDFS-6802] Some tests in TestDFSClientFailover are missing @Test annotation - HDFS - [issue]
...HDFS-6334 added new tests in TestDFSClientFailover but they are not executed by Junit framework because they don't have @Test annotation....
http://issues.apache.org/jira/browse/HDFS-6802    Author: Akira AJISAKA, 2014-08-01, 20:01
[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, 2014-08-01, 19:55
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