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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-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-5128] Allow multiple net interfaces to be used with HA namenode RPC server - HDFS - [issue]
...With the new RPCv9, NN RPC server can be bound to multiple IP addresses and serve clients connecting to different addressed using the same SPN. But the only way to have NN bind to multiple a...
http://issues.apache.org/jira/browse/HDFS-5128    Author: Kihwal Lee, 2013-08-28, 15:48
[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
[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-4080] Add a separate logger for block state change logs to enable turning off those logs - HDFS - [issue]
...Although the block-level logging in namenode is useful for debugging, it can add a significant overhead to busy hdfs clusters since they are done while the namespace write lock is held. One ...
http://issues.apache.org/jira/browse/HDFS-4080    Author: Kihwal Lee, 2013-08-14, 05:02
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