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[HIVE-10172] Fix performance regression caused by HIVE-8122 for ORC - Hive - [issue]
...See HIVE-10164 for description. We should fix this in trunk and move it to branch....
http://issues.apache.org/jira/browse/HIVE-10172    Author: Prasanth Jayachandran, 2015-04-01, 03:30
[HIVE-10114] Split strategies for ORC - Hive - [issue]
...ORC split generation does not have clearly defined strategies for different scenarios (many small orc files, few small orc files, many large files etc.). Few strategies like storing the file...
http://issues.apache.org/jira/browse/HIVE-10114    Author: Prasanth Jayachandran, 2015-03-31, 21:55
[HIVE-10129] LLAP: Fix ordering of execution modes - Hive - [issue]
...uber > llap > container execution modes. Fix the ordering in in-place update UI....
http://issues.apache.org/jira/browse/HIVE-10129    Author: Prasanth Jayachandran, 2015-03-28, 00:39
[HIVE-10127] LLAP: Port changes to timestamp stream reader after timezone fix in trunk - Hive - [issue]
...Timezone fix changes in trunk (HIVE-8746) needs changes to llap stream readers....
http://issues.apache.org/jira/browse/HIVE-10127    Author: Prasanth Jayachandran, 2015-03-28, 00:14
[HIVE-10125] LLAP: Print execution modes in tez in-place UI - Hive - [issue]
...There are different execution modes "container", "llap" and "uber". Print the execution mode of the work in in-place UI....
http://issues.apache.org/jira/browse/HIVE-10125    Author: Prasanth Jayachandran, 2015-03-27, 23:31
Re: Sort order in Hive plan? - Hive - [mail # user]
...HiIn the image that you had posted. There are 4 plus signs which means sorting happens on all four columns in key expression. Number of plus signs indicate the number of columns in key expre...
   Author: Prasanth Jayachandran, 2015-03-27, 17:02
[HIVE-9688] Support SAMPLE operator in hive - Hive - [issue]
...Hive needs SAMPLE operator to support parallel order by, skew joins and count + distinct optimizations. Random, Reservoir and Stratified sampling should cover most of the cases....
http://issues.apache.org/jira/browse/HIVE-9688    Author: Prasanth Jayachandran, 2015-03-26, 20:52
[HIVE-9689] Store histograms and distinct value estimator's bit vectors in metastore - Hive - [issue]
...Hive currently uses PCSA (Probabilistic Counting and Stochastic Averaging) algorithm to determine distinct cardinality. The NDV value determined from the UDF is stored in the metastore inste...
http://issues.apache.org/jira/browse/HIVE-9689    Author: Prasanth Jayachandran, 2015-03-26, 20:38
[HIVE-10063] LLAP: LowLevelCacheImpl does not match cached ranges properly - Hive - [issue]
...LowLevelCacheImpl uses skip list to map start disk range offset to disk ranges. Find for match in the skip list uses cache.subMap() to identify correct disk range. This will not work if the ...
http://issues.apache.org/jira/browse/HIVE-10063    Author: Prasanth Jayachandran, 2015-03-24, 02:25
[HIVE-10064] LLAP: Cache hit rate could be wrong in some cases - Hive - [issue]
...Because of HIVE-10063 cache hit rate could get wrong (requested bytes can be less than cached bytes)....
http://issues.apache.org/jira/browse/HIVE-10064    Author: Prasanth Jayachandran, 2015-03-23, 23:08
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB