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[HDFS-4995] Make getContentSummary() less expensive - HDFS - [issue]
...When users call du or count DFS command, getContentSummary() method is called against namenode. If the directory has many directories and files, it could hold the namesystem lock for a long ...
http://issues.apache.org/jira/browse/HDFS-4995    Author: Kihwal Lee, 2013-11-15, 13:28
[HDFS-5438] Flaws in block report processing can cause data loss - HDFS - [issue]
...The incremental block reports from data nodes and block commits are asynchronous. This becomes troublesome when the gen stamp for a block is changed during a write pipeline recovery. If an i...
http://issues.apache.org/jira/browse/HDFS-5438    Author: Kihwal Lee, 2013-11-15, 13:28
[HDFS-5500] Critical datanode threads may terminate silently on uncaught exceptions - HDFS - [issue]
...We've seen refreshUsed (DU) thread disappearing on uncaught exceptions. This can go unnoticed for a long time.  If OOM occurs, more things can go wrong.  On one occasion, Timer, mu...
http://issues.apache.org/jira/browse/HDFS-5500    Author: Kihwal Lee, 2013-11-14, 00:36
[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-5346] Avoid unnecessary call to getNumLiveDataNodes() for each block during IBR processing - HDFS - [issue]
...When initial block reports are being processed, checkMode() is called from incrementSafeBlockCount(). This causes the replication queues to be initialized in the middle of processing a block...
http://issues.apache.org/jira/browse/HDFS-5346    Author: Kihwal Lee, 2013-10-17, 15:28
[HDFS-5047] Supress logging of full stack trace of quota and lease exceptions - HDFS - [issue]
...This is a follow up to HDFS-4714, which made a number of request-level exceptions to the "terse" list of the namenode rpc server.  I still see several exceptions causing full stack trac...
http://issues.apache.org/jira/browse/HDFS-5047    Author: Kihwal Lee, 2013-09-25, 00:33
[HDFS-5150] Allow per NN SPN for internal SPNEGO. - HDFS - [issue]
...For more flexible configuration of HA, the SPN for NN's internal SPNEGO needs to be per-nn. Currently the config should contain "_HOST" or configured differently per node.This change should ...
http://issues.apache.org/jira/browse/HDFS-5150    Author: Kihwal Lee, 2013-09-25, 00:33
[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-4994] Audit log getContentSummary() calls - HDFS - [issue]
...Currently there getContentSummary() calls are not logged anywhere. It should be logged in the audit log....
http://issues.apache.org/jira/browse/HDFS-4994    Author: Kihwal Lee, 2013-08-22, 15:01
[HDFS-5114] getMaxNodesPerRack() in BlockPlacementPolicyDefault does not take decommissioning nodes into account. - HDFS - [issue]
...If a large proportion of data nodes are being decommissioned, one or more racks may not be writable. However this is not taken into account when the default block placement policy module inv...
http://issues.apache.org/jira/browse/HDFS-5114    Author: Kihwal Lee, 2013-08-20, 19:28
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