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[HADOOP-14146] KerberosAuthenticationHandler should authenticate with SPN in AP-REQ
...Many attempts (HADOOP-10158, HADOOP-11628, HADOOP-13565) have tried to add multiple SPN host and/or realm support to spnego authentication. The basic problem is the server tries to gue...
, 2017-04-13, 02:36
[HADOOP-9747] Reduce unnecessary UGI synchronization
...Jstacks of heavily loaded NNs show up to dozens of threads blocking in the UGI....
, 2017-04-11, 17:00
[HADOOP-9363] AuthenticatedURL will NPE if server closes connection
...A NPE occurs if the server unexpectedly closes the connection for an AuthenticatedURL w/o sending a response....
, 2017-03-31, 05:36
[HADOOP-9749] Remove synchronization for UGI.getCurrentUser
...HADOOP-7854 added synchronization to getCurrentUser due to ConcurrentModificationExceptions. This degrades NN call handler performance.The problem was not well understood at the time, ...
, 2017-03-27, 17:53
[HADOOP-14034] Allow ipc layer exceptions to selectively close connections
...IPC layer exceptions generated in the readers are translated into fatal errors - resulting in connection closure. Ex. RetriableExceptions from call queue pushback.Always closing the co...
, 2017-02-14, 20:55
[HADOOP-14033] Reduce fair call queue lock contention
...Under heavy load the call queue may run dry yet clients experience high latency.The fcq requires producers and consumers to sync via a shared lock. Polling consumers hold the lock whil...
, 2017-02-10, 00:09
[HADOOP-14031] Reduce fair call queue performance impact
...The fair call queue has performance deficits that create an illusion of reasonable performance under heavy load. However, there is excessive lock contention, priority inversion, and pu...
, 2017-01-27, 22:40
[HADOOP-9856] Avoid Krb5LoginModule.logout issue
...The kerberos login module's logout method arguably has a bug. Subject#getPrivateCredentials() returns a synchronized set. Iterating the set requires explicitly locking the set. &...
, 2017-01-07, 01:57
[HADOOP-9238] FsShell -put from stdin auto-creates paths
...FsShell put is no longer supposed to auto-create paths. There's an inconsistency where a put from stdin will still auto-create paths....
, 2017-01-07, 01:57
[HADOOP-13438] Optimize IPC server protobuf decoding
...The current use of the protobuf API uses an expensive code path. The builder uses the parser to instantiate a message, then copies the message into the builder. The parser is cre...
, 2017-01-06, 23:51
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