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[HDFS-1016] HDFS side change for HADOOP-6569 - HDFS - [issue]
...1. TestCLI configuration file should be modified.2. DistributedFileSystem#open change the exception to be FileNotFoundException when the file does not exist....
http://issues.apache.org/jira/browse/HDFS-1016    Author: Hairong Kuang, 2013-08-14, 05:54
[HDFS-1658] A less expensive way to figure out directory size - HDFS - [issue]
...Currently in order to figure out a directory size, we have to list a directory by calling RPC getListing and get the number of its children. This is an expensive operation especially when a ...
http://issues.apache.org/jira/browse/HDFS-1658    Author: Hairong Kuang, 2013-07-15, 22:32
[HDFS-3370] HDFS hardlink - HDFS - [issue]
...We'd like to add a new feature hardlink to HDFS that allows harlinked files to share data without copying. Currently we will support hardlinking only closed files, but it could be extended t...
http://issues.apache.org/jira/browse/HDFS-3370    Author: Hairong Kuang, 2013-05-14, 17:54
[HDFS-1765] Block Replication should respect under-replication block priority - HDFS - [issue]
...Currently under-replicated blocks are assigned different priorities depending on how many replicas a block has. However the replication monitor works on blocks in a round-robin fashion. So t...
http://issues.apache.org/jira/browse/HDFS-1765    Author: Hairong Kuang, 2013-02-02, 12:40
[HDFS-744] Support hsync in HDFS - HDFS - [issue]
...HDFS-731 implements hsync by default as hflush. As descriibed in HADOOP-6313, the real expected semantics should be "flushes out to all replicas and all replicas have done posix fsync equiva...
http://issues.apache.org/jira/browse/HDFS-744    Author: Hairong Kuang, 2012-09-26, 19:09
[HDFS-2421] Improve the concurrency of  SerialNumberMap in NameNode - HDFS - [issue]
...After enabled permission checking in our HDFS test cluster, our benchmark observed a significant reduced concurrency in NameNode. Investigation showed that most threads were blocked at acqui...
http://issues.apache.org/jira/browse/HDFS-2421    Author: Hairong Kuang, 2012-08-18, 23:40
[HDFS-1435] Provide an option to store fsimage compressed - HDFS - [issue]
...Our HDFS has fsimage as big as 20G bytes. It consumes a lot of network bandwidth when secondary NN uploads a new fsimage to primary NN.If we could store fsimage compressed, the problem could...
http://issues.apache.org/jira/browse/HDFS-1435    Author: Hairong Kuang, 2012-07-09, 21:28
[HDFS-1614] Provide an option to saveNamespace to save namespace uncompressed - HDFS - [issue]
...With HDFS-1435, we can configure to store fsimage compressed. This jira aims to provide an option to saveNamespace command that stores the fsimage uncompressed regardless of the configuratio...
http://issues.apache.org/jira/browse/HDFS-1614    Author: Hairong Kuang, 2012-07-09, 21:28
[HDFS-15] Rack replication policy can be violated for over replicated blocks - HDFS - [issue]
...HDFS replicas placement strategy guarantees that the replicas of a block exist on at least two racks when its replication factor is greater than one. But fsck still reports that the replicas...
http://issues.apache.org/jira/browse/HDFS-15    Author: Hairong Kuang, 2012-04-12, 06:27
Re: Datanodes optimizations - HDFS - [mail # dev]
...+ Peter and hdfs-dev  Awesome, Siying! I am so impressed by the amount of work that you've done t o improve HDFS I/O.  Could you please revert r23326 r23292 and r23290? I do not th...
   Author: Hairong Kuang, 2012-03-05, 23:40
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