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[HDFS-4714] Log short messages in Namenode RPC server for exceptions meant for clients - HDFS - [issue]
...Namenode can slow down significantly if a rogue client/job issues massive number of requests that will fail. E.g. permission denied, quota overage, etc.  The major contributing factor i...
http://issues.apache.org/jira/browse/HDFS-4714    Author: Kihwal Lee, 2014-09-04, 00:00
[HDFS-4807] DFSOutputStream.createSocketForPipeline() should not include timeout extension on connect - HDFS - [issue]
...In createSocketForPipeline(), connect() is called with a timeout set to (socket_timeout + read_extension * num_datanodes). Since it is simply connecting to a single node, it does not make se...
http://issues.apache.org/jira/browse/HDFS-4807    Author: Kihwal Lee, 2014-09-04, 00:00
[HDFS-4998] TestUnderReplicatedBlocks fails intermittently - HDFS - [issue]
...Looking at branch-2.1-beta jenkins build, this test case seems flaky.First, addToInvalidates() is called against a block on a datanode. This removes the dn from the BlockInfo in blocksMap. A...
http://issues.apache.org/jira/browse/HDFS-4998    Author: Kihwal Lee, 2014-09-03, 23:53
[HDFS-6601] Issues in finalizing rolling upgrade when there is a layout version change - HDFS - [issue]
...After HDFS-6545, we have noticed a couple of issues. The storage dir's VERSION file is not properly updated. This becomes a problem when there is a layout version change.  We can have t...
http://issues.apache.org/jira/browse/HDFS-6601    Author: Kihwal Lee, 2014-09-03, 21:34
[HDFS-6293] Issues with OIV processing PB-based fsimages - HDFS - [issue]
...There are issues with OIV when processing fsimages in protobuf. Due to the internal layout changes introduced by the protobuf-based fsimage, OIV consumes excessive amount of memory.  We...
http://issues.apache.org/jira/browse/HDFS-6293    Author: Kihwal Lee, 2014-09-03, 21:34
[HDFS-6334] Client failover proxy provider for IP failover based NN HA - HDFS - [issue]
...With RPCv9 and improvements in the SPNEGO auth handling, it is possible to set up a pair of HA namenodes utilizing IP failover as client-request fencing mechanism.This jira will make it poss...
http://issues.apache.org/jira/browse/HDFS-6334    Author: Kihwal Lee, 2014-09-03, 21:34
[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, 2014-09-03, 19:17
[HDFS-6250] TestBalancerWithNodeGroup.testBalancerWithRackLocality fails - HDFS - [issue]
...It was seen in https://builds.apache.org/job/PreCommit-HDFS-Build/6669/java.lang.AssertionError: expected:<1800> but was:<1810> at org.junit.Assert.fail(Assert.java:93) at org.ju...
http://issues.apache.org/jira/browse/HDFS-6250    Author: Kihwal Lee, 2014-08-15, 06:41
[HDFS-6016] Update datanode replacement policy to make writes more robust - HDFS - [issue]
...As discussed in HDFS-5924, writers that are down to only one node due to node failures can suffer if a DN does not restart in time. We do not worry about writes that began with single replic...
http://issues.apache.org/jira/browse/HDFS-6016    Author: Kihwal Lee, 2014-08-13, 16:45
Re: [VOTE] Migration from subversion to git for version control - HDFS - [mail # dev]
...+1 (binding)KihwalOn 8/8/14, 9:57 PM, "Karthik Kambatla"  wrote: ...
   Author: Kihwal Lee, 2014-08-11, 20:44
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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