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[HADOOP-15743] Jetty and SSL tunings to stabilize KMS performance - Hadoop - [issue]
...The KMS has very low throughput with high client failure rates.  The following config options will "stabilize" the KMS under load: Disable ECDH algos because java's SSL engine is inexplicabl...    Author: Daryn Sharp , 2018-09-12, 14:00
[HADOOP-9747] Reduce unnecessary UGI synchronization - Hadoop - [issue]
...Jstacks of heavily loaded NNs show up to dozens of threads blocking in the UGI....    Author: Daryn Sharp , 2018-07-02, 16:34
[HADOOP-10146] Workaround JDK7 Process fd close bug - Hadoop - [issue]
...JDK7's Process output streams have an async fd-close race bug.  This manifests as commands run via o.a.h.u.Shell causing threads to hang, OOM, or cause other bizarre behavior.  The...    Author: Daryn Sharp , 2018-06-04, 17:07
[HADOOP-12861] RPC client fails too quickly when server connection limit is reached - Hadoop - [issue]
...The NN's rpc server immediately closes new client connections when a connection limit is reached. The client rapidly retries a small number of times with no delay which causes clients to fai...    Author: Daryn Sharp , 2018-06-02, 17:40
[HADOOP-15402] Prevent double logout of UGI's LoginContext - Hadoop - [issue]
...HADOOP-15294 worked around a LoginContext NPE resulting from a double logout by peering into the Subject.  A cleaner fix is tracking whether the LoginContext is logged in....    Author: Daryn Sharp , 2018-04-26, 21:58
[HADOOP-14035] Reduce fair call queue backoff's impact on clients - Hadoop - [issue]
...When fcq backoff is enabled and an abusive client overflows the call queue, its connection is closed, as well as subsequent good client connections.   Disconnects are very disruptive, e...    Author: Daryn Sharp , 2018-04-24, 20:52
[HADOOP-13442] Optimize UGI group lookups - Hadoop - [issue]
...UGI#getGroups and its usage is inefficient.  The list is unnecessarily converted to multiple collections.For every invocation, the List<String> from the group provider is converte...    Author: Daryn Sharp , 2018-04-06, 21:52
[HADOOP-9363] AuthenticatedURL will NPE if server closes connection - Hadoop - [issue]
...A NPE occurs if the server unexpectedly closes the connection for an AuthenticatedURL w/o sending a response....    Author: Daryn Sharp , 2018-03-20, 18:17
[HADOOP-14687] AuthenticatedURL will reuse bad/expired session cookies - Hadoop - [issue]
...AuthenticatedURL with kerberos was designed to perform spnego, then use a session cookie to avoid renegotiation overhead.  Unfortunately the client will continue to use a cookie after i...    Author: Daryn Sharp , 2018-03-16, 02:10
[VOTE] Merging branch HDFS-7240 to trunk - Hadoop - [mail # dev]
...I’m generally neutral and looked foremost at developer impact.  Ie.  Willit be so intertwined with hdfs that each project risks destabilizing theother?  Will developers with n...
   Author: Daryn Sharp , 2018-03-02, 01:33