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[HDFS-5748] Too much information shown in the dfs health page. - HDFS - [issue]
...I've noticed that the node lists are shown in the default name node web page.  This may be fine for small clusters, but for clusters with 1000s of nodes, this is not ideal. The followin...
http://issues.apache.org/jira/browse/HDFS-5748    Author: Kihwal Lee, 2014-01-22, 13:41
[HDFS-5449] WebHdfs compatibility broken between 2.2 and 1.x / 23.x - HDFS - [issue]
...Similarly to HDFS-5403, getFileBlockLocations() fail between old (1.x, 0.23.x) and new (2.x), but this is worse since both directions won't work.  This is caused by the removal of "name...
http://issues.apache.org/jira/browse/HDFS-5449    Author: Kihwal Lee, 2014-01-10, 14:46
[HDFS-4984] Incorrect Quota counting in INodeFile - HDFS - [issue]
...INodeFile#diskspaceConsumed() checks the state of the file and use the full block size for the last block if it is under construction.  This is incorrect, because a file can be under co...
http://issues.apache.org/jira/browse/HDFS-4984    Author: Kihwal Lee, 2013-12-10, 14:55
[HDFS-4972] [branch-0.23] permission check and operation are done in a separate lock for getBlockLocations() - HDFS - [issue]
...For getBlockLocations() call, the read lock is acquired when doing permission check. But unlike other namenode methods, this is outside of the lock of the actual operation. So it ends up acq...
http://issues.apache.org/jira/browse/HDFS-4972    Author: Kihwal Lee, 2013-12-10, 14:55
[HDFS-5628] Some namenode servlets should not be internal. - HDFS - [issue]
...This is the list of internal servlets added by namenode. Name  Auth  Need to be accessible by end users  StartupProgressServlet  none  no  GetDelegationTok...
http://issues.apache.org/jira/browse/HDFS-5628    Author: Kihwal Lee, 2013-12-05, 23:09
Re: what is different between CorruptBlocks and MissingBlocks in NN FSNamesystem metrics? - HDFS - [mail # dev]
...Missing blocks are the blocks with no valid replicas. I.e. data is not available. Corrupt blocks are the ones with at least one corrupt replica. They may have healthy live replicas that are ...
   Author: Kihwal Lee, 2013-11-18, 15:48
[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-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
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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