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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-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-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
[HDFS-4890] Stop generating/sending datanode work in standby mode - HDFS - [issue]
...If NN comes up in standby and stays that way, repl queues are empty so no work is generated even though ReplicationMonitor is running. But if an ANN transitions to standby, more work can be ...
http://issues.apache.org/jira/browse/HDFS-4890    Author: Kihwal Lee, 2013-06-06, 22:02
[HDFS-4859] Add timeout in FileJournalManager - HDFS - [issue]
...Due to absence of explicit timeout in FileJournalManager, error conditions that incur long delay (usually until driver timeout) can make namenode unresponsive for long time. This directly af...
http://issues.apache.org/jira/browse/HDFS-4859    Author: Kihwal Lee, 2013-05-30, 16:07
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