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[HDFS-5983] TestSafeMode#testInitializeReplQueuesEarly fails - HDFS - [issue]
...It was seen from one of the precommit build of HDFS-5962.  The test case creates 15 blocks and then shuts down all datanodes. Then the namenode is restarted with a low safe block thresh...
http://issues.apache.org/jira/browse/HDFS-5983    Author: Kihwal Lee, 2014-04-09, 20:32
[HDFS-4861] BlockPlacementPolicyDefault does not consider decommissioning racks - HDFS - [issue]
...getMaxNodesPerRack() calculates the max replicas/rack like this:int maxNodesPerRack = (totalNumOfReplicas-1)/clusterMap.getNumOfRacks()+2;Since this does not consider the racks that are bein...
http://issues.apache.org/jira/browse/HDFS-4861    Author: Kihwal Lee, 2014-04-05, 03:17
[HDFS-5870] The legacy local reader stops working on block token expiration - HDFS - [issue]
...HDFS-5637 fixed the issue for 2.0, but after the new domain socket based local reader, the fix won't work for the old "legacy" short-circuit local reader. This is because DFSInputStream#getB...
http://issues.apache.org/jira/browse/HDFS-5870    Author: Kihwal Lee, 2014-04-03, 22:43
[HDFS-6148] LeaseManager crashes while initiating block recovery - HDFS - [issue]
...While running branch-2.4, the LeaseManager crashed with an NPE. This does not always happen on block recovery.Exception in thread"org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor@...
http://issues.apache.org/jira/browse/HDFS-6148    Author: Kihwal Lee, 2014-03-25, 17:58
[HDFS-5138] Support HDFS upgrade in HA - HDFS - [issue]
...With HA enabled, NN wo't start with "-upgrade". Since there has been a layout version change between 2.0.x and 2.1.x, starting NN in upgrade mode was necessary when deploying 2.1.x to an exi...
http://issues.apache.org/jira/browse/HDFS-5138    Author: Kihwal Lee, 2014-03-25, 14:03
[HDFS-3087] Decomissioning on NN restart can complete without blocks being replicated - HDFS - [issue]
...If a data node is added to the exclude list and the name node is restarted, the decomissioning happens right away on the data node registration. At this point the initial block report has no...
http://issues.apache.org/jira/browse/HDFS-3087    Author: Kihwal Lee, 2014-03-25, 14:03
[HDFS-6105] NN web UI for DN list loads the same jmx page multiple times. - HDFS - [issue]
...When loading "Datanodes" page of the NN web UI, the same jmx query is made multiple times. For a big cluster, that's a lot of data and overhead....
http://issues.apache.org/jira/browse/HDFS-6105    Author: Kihwal Lee, 2014-03-20, 15:00
Re: [VOTE] Merge HDFS-5535 Rolling Upgrade Improvement - HDFS - [mail # dev]
...+1 ...
   Author: Kihwal Lee, 2014-02-28, 03:03
[HDFS-6020] Fix the five findbugs warnings - HDFS - [issue]
...The latest build of the HDFS-5535 branch (rolling upgrades) shows five new findbugs warnings....
http://issues.apache.org/jira/browse/HDFS-6020    Author: Kihwal Lee, 2014-02-27, 00:57
[HDFS-5924] Utilize OOB upgrade message processing for writes - HDFS - [issue]
...After HDFS-5585 and HDFS-5583, clients and datanodes can coordinate shutdown-restart in order to minimize failures or locality loss.In this jira, HDFS client is made aware of the restart OOB...
http://issues.apache.org/jira/browse/HDFS-5924    Author: Kihwal Lee, 2014-02-25, 19:29
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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