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[HIVE-4423] Improve RCFile::sync(long) 10x - Hive - [issue]
...RCFile::sync(long) takes approx ~1 second everytime it gets called because of the inner loops in the function.From what was observed with HDFS-4710, single byte reads are an order of magnitu...
http://issues.apache.org/jira/browse/HIVE-4423    Author: Gopal V, 2013-10-16, 00:31
[HIVE-5345] Operator::close() leaks Operator::out, holding reference to buffers - Hive - [issue]
...When processing multiple splits on the same operator pipeline, the output collector in Operator has a held reference, which causes issues.Operator::close() does not de-reference the OutputCo...
http://issues.apache.org/jira/browse/HIVE-5345    Author: Gopal V, 2013-09-25, 19:27
[HIVE-5170] Sorted Bucketed Partitioned Insert hard-codes the reducer count == bucket count - Hive - [issue]
...When performing a hive sorted-partitioned insert, the insert optimizer hard-codes the number of output files to the actual bucket count of the table.https://github.com/apache/hive/blob/trunk...
http://issues.apache.org/jira/browse/HIVE-5170    Author: Gopal V, 2013-09-23, 16:46
[HIVE-4113] Optimize select count(1) with RCFile and Orc - Hive - [issue]
...select count(1) loads up every column & every row when used with RCFile."select count(1) from store_sales_10_rc" givesJob 0: Map: 5  Reduce: 1   Cumulative CPU: 31.73 sec  ...
http://issues.apache.org/jira/browse/HIVE-4113    Author: Gopal V, 2013-09-22, 21:57
[HIVE-4757] LazyTimestamp goes into irretrievable NULL mode once inited with NULL once - Hive - [issue]
...The LazyTimestamp.init() code turns into a NULL generator after parsing the very first NULL value (or format error). The code is as follows     Timestamp t = null;  ...
http://issues.apache.org/jira/browse/HIVE-4757    Author: Gopal V, 2013-09-06, 23:27
[HIVE-5093] Use a combiner for LIMIT with GROUP BY and ORDER BY operators - Hive - [issue]
...Operator trees of the following structure can have a memory friendly combiner put in place after the sort-phase "GBY-LIM" and "OBY-LIM"This will cut down on I/O when spilling to disk and par...
http://issues.apache.org/jira/browse/HIVE-5093    Author: Gopal V, 2013-08-28, 17:18
[HIVE-5144] HashTableSink allocates empty new Object[] arrays & OOMs - use a static emptyRow instead - Hive - [issue]
...The map-join hashtable sink in the local-task creates an in-memory hashtable with the following code. Object[] value = JoinUtil.computeMapJoinValues(row, joinValues[alias],... MapJ...
http://issues.apache.org/jira/browse/HIVE-5144    Author: Gopal V, 2013-08-28, 13:42
[HIVE-4926] Queries which specify clustered-by keys as constants will still scan all buckets - Hive - [issue]
...When tables are CLUSTERED BY (key) into multiple buckets, a query which specifies a key in the query predicate will still scan all buckets in the directory.In the ideal scenario, only bucket...
http://issues.apache.org/jira/browse/HIVE-4926    Author: Gopal V, 2013-07-24, 20:19
[HIVE-4681] Fix ORC TimestampTreeReader.nextVector() to handle milli-nano math corectly - Hive - [issue]
...The current TimestampTreeReader implementation is broken when fed only milliseconds.If TS = 222ms.   result.vector[i] = ... // == 0;   nanoVector.vector[i] = ... // == 22...
http://issues.apache.org/jira/browse/HIVE-4681    Author: Gopal V, 2013-07-18, 21:27
[HIVE-4436] hive.exec.parallel=true doesn't work on hadoop-2 - Hive - [issue]
...While running a hive query with multiple independent stages, hive.exec.parallel is a valid optimization to use.The query tested has 3 MR jobs - the first job is the root dependency and the 2...
http://issues.apache.org/jira/browse/HIVE-4436    Author: Gopal V, 2013-07-02, 18:24
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