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[HIVE-7074] The reducer parallelism should be a prime number for better stride protection - Hive - [issue]
...The current hive reducer parallelism results in stride issues with key distribution.a JOIN generating even numbers will get strided onto only some of the reducers.The probability of distribu...
http://issues.apache.org/jira/browse/HIVE-7074    Author: Gopal V, 2014-06-10, 03:44
[HIVE-7121] Use murmur hash to distribute HiveKey - Hive - [issue]
...The current hashCode implementation produces poor parallelism when dealing with single integers or doubles.And for partitioned inserts into a 1 bucket table, there is a significant hotspot o...
http://issues.apache.org/jira/browse/HIVE-7121    Author: Gopal V, 2014-06-10, 03:44
[HIVE-6347] ZeroCopy read path for ORC RecordReader - Hive - [issue]
...ORC can use the new HDFS Caching APIs and the ZeroCopy readers to avoid extra data copies into memory while scanning files.Implement ORC zcr codepath and a hive.orc.zerocopy flag....
http://issues.apache.org/jira/browse/HIVE-6347    Author: Gopal V, 2014-06-09, 11:21
[HIVE-7147] ORC PPD should handle CHAR/VARCHAR types - Hive - [issue]
...ORC PPD does not handle Varchar/Char data types.Caused by: java.lang.IllegalArgumentException: Unknown type VARCHAR        at org.apache.hadoop.hive.ql.io.orc.Record...
http://issues.apache.org/jira/browse/HIVE-7147    Author: Gopal V, 2014-06-02, 07:33
[HIVE-7151] NULL keys should not be shuffled for inner equi joins - Hive - [issue]
...There is a huge skew in reducer load for NULL keys in shuffle joins, resulting in one slow reducer out of many.The NULL keys will not contribute towards the inner JOIN condition for equality...
http://issues.apache.org/jira/browse/HIVE-7151    Author: Gopal V, 2014-05-31, 20:18
[HIVE-7156] Group-By operator stat-annotation only uses distinct approx to generate rollups - Hive - [issue]
...The stats annotation for a group-by only annotates the reduce-side row-count with the distinct values.The map-side gets the row-count as the rows output instead of distinct * parallelism, wh...
http://issues.apache.org/jira/browse/HIVE-7156    Author: Gopal V, 2014-05-31, 03:18
Re: Review Request 18936: HIVE-6430 MapJoin hash table has large memory overhead - Hive - [mail # dev]
...This is an automatically generated e-mail. To reply, visit:https://reviews.apache.org/r/18936/#review41936Ship it!Ship It!- Gopal VOn May 1, 2014, 2:29 a.m., Sergey Shelukhin wrote: ...
   Author: Gopal V, 2014-05-01, 19:04
[HIVE-6391] Use pre-warm APIs in Tez to improve hive query startup - Hive - [issue]
...With the addition of TEZ-766, Tez supports pre-warmed containers within the Tez session.Allow hive users to enable and use this feature from within the hive shell....
http://issues.apache.org/jira/browse/HIVE-6391    Author: Gopal V, 2014-04-23, 08:17
[HIVE-6787] ORC+ACID assumes all missing buckets are in ACID structure - Hive - [issue]
...ORC+ACID creates ACID structure splits for all missing buckets in a tablejava.lang.RuntimeException: java.io.IOException: java.io.IOException: Vectorization and ACID tables are incompatible....
http://issues.apache.org/jira/browse/HIVE-6787    Author: Gopal V, 2014-04-08, 16:12
[HIVE-6786] Off by one error in ORC PPD - Hive - [issue]
...Turning on ORC PPD makes split computation fail for a 10Tb benchmark.Narrowed down to the following code fragmenthttps://github.com/apache/hive/blob/branch-0.13/ql/src/java/org/apache/hadoop...
http://issues.apache.org/jira/browse/HIVE-6786    Author: Gopal V, 2014-04-01, 22:22
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