Can any one Clarify Queries on HIVE 0.14

0
votes

We are using Hive 0.14 in our application, when the execution engine is in MR, we are able to update ORC table , when we set Execution Engine has TEZ and perform insert /update /delete , it is throwing exception like "“Exception: org.apache.hadoop.hive.ql.lockmgr.LockException: Error communicating with the metastore Killing DAG... java.io.IOException: org.apache.hadoop.hive.ql.lockmgr.LockException: Error communicating with the metastore at org.apache.hadoop.hive.ql.exec.Heartbeater.heartbeat(Heartbeater.java:84) at”"

When we run query which has Group by and Order By and Summation of numeric field,

TEZ execution engine show + before mapper number. what signifies + in the Hive command prompt while executing query. We see performance difference when we are executing query in Hive 0.13 and 0.14. Is this expected.

1
hadoophiveazure-hdinsight

1 Answers

1
votes

Regarding your first question - is it an intermittent error or a persistent error? Also, do you have the default metastore provided by HDInsight or are you using a managed one?

The + in Tez refers to the number of running tasks. The template of the Tez output is Finished (+Running) tasks.

Regarding the performance difference, can you elaborate more? How much perf difference are you seeing and is it persistent?