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[HDFS-1766] Datanode is marked dead, but datanode process is alive and verifying blocks - HDFS - [issue]
...We have a datanode marked dead in the namenode, and it is not taking any traffic. But it is verifying blocks continuously, so the DataNode process is definitely not dead. Jstack shows that t...
http://issues.apache.org/jira/browse/HDFS-1766    Author: Hairong Kuang, 2014-04-03, 03:29
[HDFS-372] DataNode should reuse delBlockFromDisk - HDFS - [issue]
...FSDataSet should reuse delBlcokFromDisk where it should/can be used like in invalidateBlock....
http://issues.apache.org/jira/browse/HDFS-372    Author: Hairong Kuang, 2014-02-04, 00:46
[HDFS-2362] More Improvements on NameNode Scalability - HDFS - [issue]
...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. I...
http://issues.apache.org/jira/browse/HDFS-2362    Author: Hairong Kuang, 2014-01-10, 00:38
[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
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