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[HIVE-9624] NullPointerException in MapJoinOperator.processOp(MapJoinOperator.java:253) for TPC-DS Q75 against un-partitioned schema - Hive - [issue]
...Running TPC-DS Q75 against a non-partitioned schema fails with Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unexpected exception: null at org.apache.hadoop.hive.ql.exec.MapJo...
http://issues.apache.org/jira/browse/HIVE-9624    Author: Mostafa Mokhtar, 2015-03-03, 02:17
[HIVE-9647] Discrepancy in cardinality estimates between partitioned and un-partitioned tables - Hive - [issue]
...High-level summaryHiveRelMdSelectivity.computeInnerJoinSelectivity relies on per column number of distinct value to estimate join selectivity.The way statistics are aggregated for partitione...
http://issues.apache.org/jira/browse/HIVE-9647    Author: Mostafa Mokhtar, 2015-03-02, 19:57
[HIVE-9623] NullPointerException in MapJoinOperator.processOp(MapJoinOperator.java:253) for TPC-DS Q75 against un-partitioned schema - Hive - [issue]
...Running TPC-DS Q75 against a non-partitioned schema fails with Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unexpected exception: null at org.apache.hadoop.hive.ql.exec.MapJo...
http://issues.apache.org/jira/browse/HIVE-9623    Author: Mostafa Mokhtar, 2015-02-28, 03:28
[HIVE-9712] Row count and data size are set to LONG.MAX when source table has 0 rows - Hive - [issue]
...TPC-DS Q66 generates and in-efficient plan because cardinality estimate of dimension table gets set to 9223372036854775807.    Map 10            ...
http://issues.apache.org/jira/browse/HIVE-9712    Author: Mostafa Mokhtar, 2015-02-18, 08:55
[HIVE-9714] Physical optimizer : Under estimation for left join outer condition - Hive - [issue]
...For the query below which is a subset of TPC-DS Query 80, CBO joins catalog_sales with catalog_returns first although the CE of the join is relatively high.The physical optimizer estimates f...
http://issues.apache.org/jira/browse/HIVE-9714    Author: Mostafa Mokhtar, 2015-02-18, 03:46
[HIVE-9713] CBO : inefficient join order created for left join outer condition - Hive - [issue]
...For the query below which is a subset of TPC-DS Query 80, CBO joins catalog_sales with catalog_returns first although the CE of the join is relatively high.catalog_sales should be joined wit...
http://issues.apache.org/jira/browse/HIVE-9713    Author: Mostafa Mokhtar, 2015-02-18, 03:46
[HIVE-9695] Redundant filter operator in reducer Vertex when CBO is disabled - Hive - [issue]
...There is a redundant filter operator in reducer Vertex when CBO is disabled.Query select         ss_item_sk, ss_ticket_number, ss_store_sk    from&nbs...
http://issues.apache.org/jira/browse/HIVE-9695    Author: Mostafa Mokhtar, 2015-02-14, 23:31
[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, 2015-02-07, 01:06
[HIVE-9604] CBO : Presence of hybrid join condition sets of join order optimizations - Hive - [issue]
...When a query has a join between two tables on hybrid join condition (conjunction + disjunction) the resulting join order from CBO is suboptimal.Re-writing the query results in 9x performance...
http://issues.apache.org/jira/browse/HIVE-9604    Author: Mostafa Mokhtar, 2015-02-06, 23:10
[HIVE-9602] Hive on Tez : Launch an application master only when needed - Hive - [issue]
...When all Yarn containers are busy a new Hive CLI session with Tez set as the execution engine won't start as it attempts to allocate a container for the AM.The request is to launch an AM onl...
http://issues.apache.org/jira/browse/HIVE-9602    Author: Mostafa Mokhtar, 2015-02-06, 22:02
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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