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[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, 2013-10-10, 02:55
[HDFS-5293] Symlink resolution requires unnecessary RPCs - HDFS - [issue]
...When the NN encounters a symlink, it throws an UnresolvedLinkException.  This exception contains only the path that is a symlink.  The client issues another RPC to obtain the link ...
http://issues.apache.org/jira/browse/HDFS-5293    Author: Daryn Sharp, 2013-10-07, 23:40
[HDFS-5294] DistributedFileSystem#getFileLinkStatus should not fully qualify the link target - HDFS - [issue]
...The NN returns a FileStatus containing the exact link target as specified by the user at creation.  However, DistributedFileSystem#getFileLinkStatus explicit overwrites the target with ...
http://issues.apache.org/jira/browse/HDFS-5294    Author: Daryn Sharp, 2013-10-07, 15:36
[HDFS-5240] Separate formatting from logging in the audit logger API - HDFS - [issue]
...The audit logger API should be extended (in a compatible manner) to separate the formatting of the log message from the actual logging of the message....
http://issues.apache.org/jira/browse/HDFS-5240    Author: Daryn Sharp, 2013-09-24, 14:29
[HDFS-5238] Improve NN operation throughput - HDFS - [issue]
...Umbrella jira to track improvements from profiling the NN....
http://issues.apache.org/jira/browse/HDFS-5238    Author: Daryn Sharp, 2013-09-20, 16:19
[HDFS-5243] Remove contention during block token creation - HDFS - [issue]
...Creating a block token is unnecessarily synchronized....
http://issues.apache.org/jira/browse/HDFS-5243    Author: Daryn Sharp, 2013-09-20, 15:51
[HDFS-5029] Token operations should not block read operations - HDFS - [issue]
...Token operations unnecessarily obtain the write lock on the namespace.  Edits for token operations are independent of edits for other namespace write operations, and the edits have no o...
http://issues.apache.org/jira/browse/HDFS-5029    Author: Daryn Sharp, 2013-09-06, 19:30
Re: [VOTE] Release Apache Hadoop 2.1.0-beta - HDFS - [mail # dev]
...I broke RPC QOP for integrity and privacy options. :(  See blocker HADOOP-9816.  I think I understand the problem and it shouldn't be hard to fix.  The bug went unnoticed beca...
   Author: Daryn Sharp, 2013-08-01, 16:38
Re: Why Hadoop force using DNS? - HDFS - [mail # user]
...One reason is the lists to accept or reject DN accepts hostnames.  If dns temporarily can't resolve an IP then an unauthorized DN might slip back into the cluster, or a decommissioning ...
   Author: Daryn Sharp, 2013-07-29, 13:48
[HDFS-4690] Namenode exits if entering safemode while secret manager is edit logging - HDFS - [issue]
...Going into safemode involves stopping the secret manager's thread.  An interrupt is sent to this thread.  If this occurs while the thread is logging an edit, the resulting exceptio...
http://issues.apache.org/jira/browse/HDFS-4690    Author: Daryn Sharp, 2013-06-05, 15:45
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