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[HDFS-5586] Add quick-restart option for datanode - HDFS - [issue]
...This feature, combined with the graceful shutdown feature, will enable data nodes to come back up and start serving quickly.  This is likely a command line option for data node, which t...
http://issues.apache.org/jira/browse/HDFS-5586    Author: Kihwal Lee, 2014-02-20, 22:16
[HDFS-5584] Add OOB upgrade response and client-side logic for reads - HDFS - [issue]
...Similarly to HDFS-5583, readers can also benefit from the knowledge that a data node failure is caused by an upgrade restart.  Instead of permanently removing from the potential data so...
http://issues.apache.org/jira/browse/HDFS-5584    Author: Kihwal Lee, 2014-02-13, 13:42
[HDFS-5881] Fix skip() of the short-circuit local reader (legacy). - HDFS - [issue]
...It looks like a bug in skip() was introduced by HDFS-2356 and got fixed as a part of HDFS-2834, which is an API change JIRA.  This bug causes to skip more (as many as the new offsetFrom...
http://issues.apache.org/jira/browse/HDFS-5881    Author: Kihwal Lee, 2014-02-07, 14:52
[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
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