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[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
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
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB