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[HIVE-9392] JoinStatsRule miscalculates join cardinality as incorrect NDV is used due to column names having duplicated fqColumnName - Hive - [issue]
...In JoinStatsRule.process the join column statistics are stored in HashMap  joinedColStats, the key used which is the ColStatistics.fqColName is duplicated between join column in the sam...
http://issues.apache.org/jira/browse/HIVE-9392    Author: Mostafa Mokhtar, 2015-01-22, 22:56
[HIVE-9368] Physical optimizer : Join order in Explain is different from join order provided by Calcite - Hive - [issue]
...Join order in explain is different from that provided by Calcite, this was observed during the Fidelity POC. Logical plan from Calcite :2015-01-13 18:54:42,892 DEBUG [main]: parse.CalcitePla...
http://issues.apache.org/jira/browse/HIVE-9368    Author: Mostafa Mokhtar, 2015-01-14, 00:40
[HIVE-9069] Simplify filter predicates for CBO - Hive - [issue]
...Simplify predicates for disjunctive predicates so that can get pushed down to the scan.Looks like this is still an issue, some of the filters can be pushed down to the scan.set hive.cbo.enab...
http://issues.apache.org/jira/browse/HIVE-9069    Author: Mostafa Mokhtar, 2014-12-10, 22:35
[HIVE-7914] Simplify join predicates for CBO to avoid cross products - Hive - [issue]
...Simplify join predicates for disjunctive predicates to avoid cross products.For TPC-DS query 13 we generate a cross products.The join predicate on (store_sales x customer_demographics) , &nb...
http://issues.apache.org/jira/browse/HIVE-7914    Author: Mostafa Mokhtar, 2014-12-10, 22:35
[HIVE-7913] Simplify filter predicates for CBO - Hive - [issue]
...Simplify predicates for disjunctive predicates so that can get pushed down to the scan.For TPC-DS query 13 we push down predicates in the following form where c_martial_status in ('M','D','U...
http://issues.apache.org/jira/browse/HIVE-7913    Author: Mostafa Mokhtar, 2014-12-10, 22:32
[HIVE-9068] Hive : With CBO disabled Vectorization in Map join disabled causing 100% increase in elapsed time and CPU (possibly due to redundant filter operator) - Hive - [issue]
...With CBO off there is a redundant filter operator  Filter Operator                          predicate: ((null is nu...
http://issues.apache.org/jira/browse/HIVE-9068    Author: Mostafa Mokhtar, 2014-12-10, 22:14
[HIVE-8454] Select Operator does not rename column stats properly in case of select star - Hive - [issue]
...The estimated data size of some Select Operators is 0. BytesBytesHashMap uses data size to determine the estimated initial number of entries in the hashmap. If this data size is 0 then excep...
http://issues.apache.org/jira/browse/HIVE-8454    Author: Mostafa Mokhtar, 2014-11-18, 22:06
[HIVE-8727] Dag summary has incorrect row counts and duration per vertex - Hive - [issue]
...During the code review for HIVE-8495 some code was reworked which broke some of INPUT/OUTPUT counters and duration.Patch attached which fixes that....
http://issues.apache.org/jira/browse/HIVE-8727    Author: Mostafa Mokhtar, 2014-11-18, 21:49
[HIVE-8044] Container size and hash table size should be taken into account before deciding to do a MapJoin - Hive - [issue]
...Benefits of having a cost based optimizer is that we can estimate the number of rows and amount per operator, this information should be provided by CBO while the physical plan is being gene...
http://issues.apache.org/jira/browse/HIVE-8044    Author: Mostafa Mokhtar, 2014-11-13, 19:44
[HIVE-7664] VectorizedBatchUtil.addRowToBatchFrom is not optimized for Vectorized execution and takes 25% CPU - Hive - [issue]
...In a Group by heavy vectorized Reducer vertex 25% of CPU is spent in VectorizedBatchUtil.addRowToBatchFrom().Looked at the code of VectorizedBatchUtil.addRowToBatchFrom and it looks like it ...
http://issues.apache.org/jira/browse/HIVE-7664    Author: Mostafa Mokhtar, 2014-11-13, 04:35
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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