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[HDFS-4080] Add a separate logger for block state change logs to enable turning off those logs - HDFS - [issue]
...Although the block-level logging in namenode is useful for debugging, it can add a significant overhead to busy hdfs clusters since they are done while the namespace write lock is held. One ...
http://issues.apache.org/jira/browse/HDFS-4080    Author: Kihwal Lee, 2013-08-14, 05:02
[HDFS-4186] logSync() is called with the write lock held while releasing lease - HDFS - [issue]
...As pointed out in HDFS-4138, when the lease monitor calls internalReleaseLease(), it acquires the namespace write lock. Inside internalReleaseLease(), if a block recovery is needed, the leas...
http://issues.apache.org/jira/browse/HDFS-4186    Author: Kihwal Lee, 2013-08-13, 13:52
[HDFS-4993] fsck can fail if a file is renamed or deleted - HDFS - [issue]
...In NamenodeFsck#check(), the getListing() and getBlockLocations() are not synchronized, so the file deletions or renames at the right moment can cause FileNotFoundException and failure of fs...
http://issues.apache.org/jira/browse/HDFS-4993    Author: Kihwal Lee, 2013-08-10, 14:04
[HDFS-5083] Update the HDFS compatibility version range - HDFS - [issue]
...Since we have made incompatible changes including RPCv9, the following needs to be updated. For branch-2 and branch-2.*,  I think it needs to be set to 2.1.0.DFS_NAMENODE_MIN_SUPPORTED_...
http://issues.apache.org/jira/browse/HDFS-5083    Author: Kihwal Lee, 2013-08-09, 19:59
[HDFS-5071] Change hdfs-nfs parent project to hadoop-project - HDFS - [issue]
...https://builds.apache.org/job/Hadoop-Hdfs-trunk/HDFS trunk build has been failing for a while due to failures in HDFS-NFS....
http://issues.apache.org/jira/browse/HDFS-5071    Author: Kihwal Lee, 2013-08-08, 15:24
[HDFS-4937] ReplicationMonitor can infinite-loop in BlockPlacementPolicyDefault#chooseRandom() - HDFS - [issue]
...When a large number of nodes are removed by refreshing node lists, the network topology is updated. If the refresh happens at the right moment, the replication monitor thread may stuck in th...
http://issues.apache.org/jira/browse/HDFS-4937    Author: Kihwal Lee, 2013-08-05, 23:05
[HDFS-5070] Do not initialize the replications queues in the middle of block report processing - HDFS - [issue]
...While processing an initial block report in the start-up safe mode, namenode can reach the safe block threshold in the middle of processing the report. This is noticed when checkMode() is ca...
http://issues.apache.org/jira/browse/HDFS-5070    Author: Kihwal Lee, 2013-08-05, 22:33
[HDFS-5032] Write pipeline failures caused by slow or busy disk may not be handled properly. - HDFS - [issue]
...Here is one scenario I have recently encountered in a hbase cluster.The 1st datanode in a write pipeline's disk became extremely busy for many minutes and it caused block writes on the disk ...
http://issues.apache.org/jira/browse/HDFS-5032    Author: Kihwal Lee, 2013-07-25, 15:45
[HDFS-5010] Reduce the frequency of getCurrentUser() calls from namenode - HDFS - [issue]
...According to the "worst" jstack of a busy namenode I took, there were 29 BLOCKED handler threads. All of them were blocked on the UGI class lock. Here is the breakdown: 2 ensureInitialized()...
http://issues.apache.org/jira/browse/HDFS-5010    Author: Kihwal Lee, 2013-07-20, 17:31
[HDFS-4998] TestUnderReplicatedBlocks fails intermittently - HDFS - [issue]
...Looking at branch-2.1-beta jenkins build, this test case seems flaky.First, addToInvalidates() is called against a block on a datanode. This removes the dn from the BlockInfo in blocksMap. A...
http://issues.apache.org/jira/browse/HDFS-4998    Author: Kihwal Lee, 2013-07-17, 15:11
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