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[YARN-6681] Eliminate double-copy of child queues in canAssignToThisQueue
...20% of the time in AbstractCSQueue#canAssignToThisQueue is spent performing two duplications a treemap of child queues into a list - once to test for null, second to see if it's empty.  ...
, 2017-06-25, 12:24
[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...
, 2017-06-23, 18:31
[HADOOP-14578] Bind IPC connections to kerberos UPN host for proxy users
...The IPC client will only bind to a kerberos UPN host for the effective user. For proxy users, it does not bind to the authenticating real user's UPN host. This is inconsistent an...
, 2017-06-22, 23:30
[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...
, 2017-06-21, 16:55
[YARN-6679] Reduce Resource instance overhead via non-PBImpl
...Creating and using transient PB-based Resource instances during scheduling is very expensive. The overhead can be transparently reduced by internally using lightweight non-PB based ins...
, 2017-06-21, 15:42
[YARN-6680] Avoid locking overhead for NO_LABEL lookups
...Labels are managed via a hash that is protected with a read lock. The lock acquire and release are each just as expensive as the hash lookup itself - resulting in a 3X slowdown....
, 2017-06-19, 17:36
[HDFS-5239] Allow FSNamesystem lock fairness to be configurable
...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...
, 2017-06-15, 05:27
[YARN-6682] Improve performance of AssignmentInformation datastructures
...AssignmentInformation is inefficient and creates lots of garbage that increase gc pressure. It creates 3 hashmaps that each contain only 2 enum-based keys. This requires wrapper node o...
, 2017-06-09, 06:33
[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...
, 2017-06-08, 00:13
[HADOOP-14032] Reduce fair call queue priority inversion
...The fcq's round robin multiplexer actually rewards abusive users. Queue consumers scan for a call from the roving multiplexer index to the lowest prio ring before wrapping around to th...
, 2017-06-08, 00:13
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