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[HADOOP-11867] FS API: Add a high-performance vectored Read to FSDataInputStream API - Hadoop - [issue]
...The most significant way to read from a filesystem in an efficient way is to let the FileSystem implementation handle the seek behaviour underneath the API to be the most efficient as possib...    Author: Gopal V , 2018-12-13, 14:05
[HIVE-16100] Dynamic Sorted Partition optimizer loses sibling operators - Hive - [issue]
...      // unlink connection between FS and its p...    Author: Gopal V , 2018-12-12, 00:30
[HIVE-21005] LLAP: Reading more stripes per-split leaks ZlibCodecs - Hive - [issue]
...OrcEncodedDataReader - calls ensureDataReader in a loop, overwriting itself    for (int stripeIxMod = 0; stripeIxMod < stripeRgs.length; ++stripeIxMod) {....     ...    Author: Gopal V , 2018-12-11, 18:35
[HIVE-21012] CBO: CASE + CONCAT expr is not converted to optimized SQL - Hive - [issue]
...create temporary table t3 (receipt_required_flag string, inspection_required_flag string);explain extended select  CASEWHEN concat(concat(coalesce(t3.receipt_required_flag, 'N'), '~'), ...    Author: Gopal V , 2018-12-10, 20:41
[HIVE-20999] LLAP IO: MutableQuantiles is contended heavily - Hive - [issue]
...MutableQuantiles::add() is synchronized across all threads.IO-Elevator-Thread-0 [DAEMON] State: BLOCKED CPU usage on sample: 316msorg.apache.hadoop.metrics2.lib.MutableQuantiles.add(long) Mu...    Author: Gopal V , 2018-12-04, 06:39
[HIVE-20989] JDBC: The GetOperationStatus + log can block query progress via sleep() - Hive - [issue]
...There is an exponential sleep operation inside the CLIService which can end up adding tens of seconds to a query which has already completed."HiveServer2-Handler-Pool: Thread-9373" #9373 pri...    Author: Gopal V , 2018-11-30, 07:40
[HIVE-20983] Vectorization: Scale up small hashtables, when collisions are detected - Hive - [issue]
...Hive's hashtable estimates are getting better with HyperLogLog stats in place, but an accurate estimate does not always result in a low number of collisions.The hashtables which contain a ve...    Author: Gopal V , 2018-11-29, 12:01
[HIVE-20951] LLAP: Set Xms to 50% always - Hive - [issue]
...The lack of GC pauses is killing LLAP containers whenever the significant amount of memory is consumed by the off-heap structures which aren't cleaned up automatically until the GC runs.Ther...    Author: Gopal V , 2018-11-29, 04:23
[HIVE-20973] Optimizer: Reduce de-dup changes the hash-function of a reducer edge - Hive - [issue]
...    private static void propagateMaxNumReducers(ReduceSinkJoinDeDuplicateProcCtx dedupCtx,            ReduceSinkOperator rsOp, int maxNumReducers) thr...    Author: Gopal V , 2018-11-27, 07:38
[HIVE-18928] HS2: Perflogger has a race condition - Hive - [issue]
...Caused by: java.util.ConcurrentModificationException        at java.util.HashMap$HashIterator.nextNode( ~[?:1.8.0_112]        at jav...    Author: Gopal V , 2018-11-19, 18:33