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[HADOOP-10173] Remove UGI from DIGEST-MD5 SASL server creation - Hadoop - [issue]
...Instantiation of SASL server instances within the readers threads is performed within a UGI.getCurrentUser().doAs.  getCurrentUser is synchronized, and doAs also degrades performance. &...
http://issues.apache.org/jira/browse/HADOOP-10173    Author: Daryn Sharp, 2014-01-03, 14:47
[HADOOP-10172] Cache SASL server factories - Hadoop - [issue]
...Performance for SASL server creation is atrocious.  Sasl.createSaslServer does not cache the provider resolution for the factories.  Factory resolution and server instantiation has...
http://issues.apache.org/jira/browse/HADOOP-10172    Author: Daryn Sharp, 2013-12-20, 15:09
[HADOOP-10174] Run RPC server within the Subject that instantiated it - Hadoop - [issue]
...RPC servers would not require as many doAs blocks if the server threads run within the access control context that instantiates the server....
http://issues.apache.org/jira/browse/HADOOP-10174    Author: Daryn Sharp, 2013-12-17, 19:24
Re: How can I get FSNamesystem of running NameNode in cluster? - Hadoop - [mail # dev]
...Are you adding something internal to the NN?  If not, you cannot get the namesystem instance via a client unless you are using a minicluster object.  Daryn  On Dec 9, 2013, at...
   Author: Daryn Sharp, 2013-12-09, 14:42
[HADOOP-9955] RPC idle connection closing is extremely inefficient - Hadoop - [issue]
...The RPC server listener loops accepting connections, distributing the new connections to socket readers, and then conditionally & periodically performs a scan for idle connections.  ...
http://issues.apache.org/jira/browse/HADOOP-9955    Author: Daryn Sharp, 2013-11-15, 13:28
[HADOOP-10099] Reduce chance for RPC denial of service - Hadoop - [issue]
...A RPC server may accept an unlimited number of connections unless indirectly bounded by a blocking operation in the RPC handler threads.  The NN's namespace locking happens to cause thi...
http://issues.apache.org/jira/browse/HADOOP-10099    Author: Daryn Sharp, 2013-11-14, 19:28
Re: [VOTE] Release Apache Hadoop 2.2.0 - Hadoop - [mail # dev]
...+1  I did some basic testing and it appears to work fine.  Daryn  On Oct 7, 2013, at 2:00 AM, Arun C Murthy wrote:  ...
   Author: Daryn Sharp, 2013-10-07, 15:28
[HADOOP-10014] Symlink resolution is fundamentally broken for multi-layered filesystems - Hadoop - [issue]
...Symlink resolution is performed on a per-filesystem basis.  In a multi-layered filesystem, the symlinks need to be resolved relative to the highest level filesystem in the stack.  ...
http://issues.apache.org/jira/browse/HADOOP-10014    Author: Daryn Sharp, 2013-10-04, 17:34
Re: symlink support in Hadoop 2 GA - Hadoop - [mail # dev]
...I reluctantly agree that we should disable symlinks in 2.2 until we can sort out the compatibility issues.  I'm reluctant in the sense that its a feature users have long wanted, and it'...
   Author: Daryn Sharp, 2013-10-03, 21:08
[HADOOP-10013] FileSystem checkPath accepts invalid paths with an authority but no scheme - Hadoop - [issue]
...FileSystem#checkPath will consider paths of the form //junk/path as being valid for the given fs.  The problem is checkPath shorts out if the path contains no scheme - assuming it must ...
http://issues.apache.org/jira/browse/HADOOP-10013    Author: Daryn Sharp, 2013-10-03, 16:40
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