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[HDFS-6964] NN fails to fix under replication leading to data loss - HDFS - [issue]
...We've encountered lost blocks due to node failure even when there is ample time to fix the under-replication.2 nodes were lost.  The 3rd node with the last remaining replicas averaged 1...
http://issues.apache.org/jira/browse/HDFS-6964    Author: Daryn Sharp, 2014-10-21, 17:54
[HDFS-6948] DN rejects blocks if it has older UC block - HDFS - [issue]
...DNs appear to always reject blocks, even with newer genstamps, if it already has a UC copy in its tmp dir.ReplicaAlreadyExistsException: BlockXXX alreadyexists in state TEMPORARY and thus ca...
http://issues.apache.org/jira/browse/HDFS-6948    Author: Daryn Sharp, 2014-09-06, 01:32
[HDFS-7005] DFS input streams do not timeout - HDFS - [issue]
...Input streams lost their timeout.  The problem appears to be DFSClient#newConnectedPeer does not set the read timeout.  During a temporary network interruption the server will clos...
http://issues.apache.org/jira/browse/HDFS-7005    Author: Daryn Sharp, 2014-09-05, 21:18
[HDFS-6967] DNs may OOM under high webhdfs load - HDFS - [issue]
...Webhdfs uses jetty.  The size of the request thread pool is limited, but jetty will accept and queue infinite connections.  Every queued connection is "heavy" with buffers, etc. &n...
http://issues.apache.org/jira/browse/HDFS-6967    Author: Daryn Sharp, 2014-09-05, 18:11
[HDFS-5239] Allow FSNamesystem lock fairness to be configurable - HDFS - [issue]
...The fairness of the FSNamesystem#fsLock is hardcoded to true.  Using an unfair lock provides a negligible increase to throughput.  However this is due to bottlenecks elsewhere in t...
http://issues.apache.org/jira/browse/HDFS-5239    Author: Daryn Sharp, 2014-09-04, 00:41
[HDFS-4232] NN fails to write a fsimage with stale leases - HDFS - [issue]
...The reading of a fsimage will ignore leases for non-existent files, but the writing of an image will fail if there are leases for non-existent files.  If the image contains leases that ...
http://issues.apache.org/jira/browse/HDFS-4232    Author: Daryn Sharp, 2014-09-04, 00:24
[HDFS-4248] Renames may remove file leases - HDFS - [issue]
...Renames of directories may incorrectly remove the paths in leases under the tree being moved....
http://issues.apache.org/jira/browse/HDFS-4248    Author: Daryn Sharp, 2014-09-04, 00:24
[HDFS-4247] saveNamespace should be tolerant of dangling lease - HDFS - [issue]
...Dangling leases to non-existent paths cause the NN to fail to start....
http://issues.apache.org/jira/browse/HDFS-4247    Author: Daryn Sharp, 2014-09-04, 00:24
[HDFS-3990] NN's health report has severe performance problems - HDFS - [issue]
...The dfshealth page will place a read lock on the namespace while it does a dns lookup for every DN.  On a multi-thousand node cluster, this often results in 10s+ load time for the healt...
http://issues.apache.org/jira/browse/HDFS-3990    Author: Daryn Sharp, 2014-09-04, 00:19
[HDFS-4532] RPC call queue may fill due to current user lookup - HDFS - [issue]
...Audit logging need to invoke UGI.getCurrentUser to log the user performing an operation.  This is a synch'ed method, so audit logging is effectively serializing the completion of concur...
http://issues.apache.org/jira/browse/HDFS-4532    Author: Daryn Sharp, 2014-09-03, 23:55
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