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[HIVE-4436] hive.exec.parallel=true doesn't work on hadoop-2 - Hive - [issue]
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...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...
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http://issues.apache.org/jira/browse/HIVE-4436
Author: Gopal V,
2013-05-18, 15:35
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[HIVE-4486] FetchOperator slows down SMB map joins by 50% when there are many partitions - Hive - [issue]
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...While looking at log files for SMB joins in hive, it was noticed that the actual join op didn't show up as a significant fraction of the time spent. Most of the time was spent parsing config...
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http://issues.apache.org/jira/browse/HIVE-4486
Author: Gopal V,
2013-05-18, 06:17
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[HIVE-4113] select count(1) reads all columns with RCFile - Hive - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/HIVE-4113
Author: Gopal V,
2013-05-17, 17:38
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[HIVE-3992] Hive RCFile::sync(long) does a sub-sequence linear search for sync blocks - Hive - [issue]
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...The following function does some bad I/Opublic synchronized void sync(long position) throws IOException { ... try { seek(p...
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http://issues.apache.org/jira/browse/HIVE-3992
Author: Gopal V,
2013-05-16, 22:11
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[HIVE-4488] BucketizedHiveInputFormat is pessimistic with SMB split generation - Hive - [issue]
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...BucketizedHiveInputFormat generates fewer splits than possible when faced with a table structure where both tables are partitioned.When debugging query82 from the TPC-DS spec, there were 7 p...
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http://issues.apache.org/jira/browse/HIVE-4488
Author: Gopal V,
2013-05-03, 15:20
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[HIVE-4423] Improve RCFile::sync(long) 10x - Hive - [issue]
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...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...
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http://issues.apache.org/jira/browse/HIVE-4423
Author: Gopal V,
2013-04-27, 20:53
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Review Request: Improve RCFile::sync(long) by 10x - Hive - [mail # dev]
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...This is an automatically generated e-mail. To reply, visit: https://reviews.apache.org/r/10795/ Review request for hive, Ashutosh Chauhan and Gunther Hagleitner. Description &nb...
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Author: Gopal V,
2013-04-26, 11:25
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[HIVE-4103] Remove System.gc() call from the map-join local-task loop - Hive - [issue]
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...Hive's HashMapWrapper calls System.gc() twice within the HashMapWrapper::isAbort() which produces a significant slow-down during the loop.2013-03-01 04:54:28 The gc calls took 677 ms2013-03-...
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http://issues.apache.org/jira/browse/HIVE-4103
Author: Gopal V,
2013-04-24, 22:07
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[HIVE-4318] OperatorHooks hit performance even when not used - Hive - [issue]
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...Operator Hooks inserted into Operator.java cause a performance hit even when it is not being used.For a count(1) query tested with & without the operator hook calls.with2013-04-09 07:33:...
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http://issues.apache.org/jira/browse/HIVE-4318
Author: Gopal V,
2013-04-24, 22:02
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[HIVE-4078] Delay the serialize-deserialize pair in CommonJoinTaskDispatcher - Hive - [issue]
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...CommonJoinProcessor tries to clone a MapredWork while attempting a conversion to a map-join // deep copy a new mapred work from xml InputStream in = new ByteArrayInputS...
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http://issues.apache.org/jira/browse/HIVE-4078
Author: Gopal V,
2013-04-11, 21:57
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