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[HDFS-5497] Performance may suffer when UnderReplicatedBlocks is used heavily - HDFS - [issue]
...Currently UnderReplicatedBlocks uses LightWeightLinkedSet with the default initial size of 16.  If there are a lot of under-replicated blocks, insertion and removal can be very expensiv...
http://issues.apache.org/jira/browse/HDFS-5497    Author: Kihwal Lee, 2013-11-11, 21:21
[HDFS-5142] Namenode crashes with NPE in ReplicationMonitor - HDFS - [issue]
...When ReplicationMonitor creates and adds a replication work for a block, its INodeFile (0.23) or BlockCollection (2.x) is recorded. This is done under the FSN write lock, but the actual choo...
http://issues.apache.org/jira/browse/HDFS-5142    Author: Kihwal Lee, 2013-08-29, 22:27
[HDFS-3718] Datanode won't shutdown because of runaway DataBlockScanner thread - HDFS - [issue]
...Datanode sometimes does not shutdown because the block pool scanner thread keeps running. It prints out "Starting a new period" every five seconds, even after shutdown() is called.  Som...
http://issues.apache.org/jira/browse/HDFS-3718    Author: Kihwal Lee, 2013-08-19, 03:44
[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-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-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
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