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[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
[HDFS-4999] fix TestShortCircuitLocalRead on branch-2 - HDFS - [issue]
...Look at the failures in https://builds.apache.org/job/Hadoop-branch-2.1-beta.The trunk build skips them probably because -Pnative is not specified....
http://issues.apache.org/jira/browse/HDFS-4999    Author: Kihwal Lee, 2013-07-16, 22:33
[HDFS-4887] TestNNThroughputBenchmark exits abruptly - HDFS - [issue]
...After HDFS-4840, TestNNThroughputBenchmark exits in the middle. This is because ReplicationMonitor is being stopped while NN is still running. This is only valid during testing. In normal ca...
http://issues.apache.org/jira/browse/HDFS-4887    Author: Kihwal Lee, 2013-07-11, 15:09
Re: data loss after cluster wide power loss - HDFS - [mail # dev]
...For the ext3 bug Colin mentioned, see https://bugzilla.redhat.com/show_bug.cgi?id=592961. This was fixed in 2.6.32 and backported in RHEL 5.4 (or CENTOS). This has more to do with file data ...
   Author: Kihwal Lee, 2013-07-03, 18:57
[HDFS-4714] Log short messages in Namenode RPC server for exceptions meant for clients - HDFS - [issue]
...Namenode can slow down significantly if a rogue client/job issues massive number of requests that will fail. E.g. permission denied, quota overage, etc.  The major contributing factor i...
http://issues.apache.org/jira/browse/HDFS-4714    Author: Kihwal Lee, 2013-07-03, 17:47
[HDFS-4840] ReplicationMonitor gets NPE during shutdown - HDFS - [issue]
...TestBlocksWithNotEnoughRacks occasionally fails during test tear down because RaplicationMonitor gets NPE.Seen at https://builds.apache.org/job/Hadoop-Hdfs-trunk/1406/....
http://issues.apache.org/jira/browse/HDFS-4840    Author: Kihwal Lee, 2013-06-28, 00:44
[HDFS-4845] FSEditLogLoader gets NPE while accessing INodeMap in TestEditLogRace - HDFS - [issue]
...TestEditLogRace fails occasionally because it gets NPE from manipulating INodeMap while loading edits....
http://issues.apache.org/jira/browse/HDFS-4845    Author: Kihwal Lee, 2013-06-14, 15:15
Re: Why is FileSystem.createNonRecursive deprecated? - HDFS - [mail # dev]
...It seems the transition within hadoop needs to happen before deprecating FileSystem. I think createNonRecursive() was marked deprecated from the beginning under the assumption that this tran...
   Author: Kihwal Lee, 2013-06-13, 16:49
[HDFS-4867] metaSave NPEs when there are invalid blocks in repl queue. - HDFS - [issue]
...Since metaSave cannot get the inode holding a orphaned/invalid block, it NPEs and stops generating further report. Normally ReplicationMonitor removes them quickly, but if the queue is huge,...
http://issues.apache.org/jira/browse/HDFS-4867    Author: Kihwal Lee, 2013-06-12, 23:46
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