kevin zou created DRILL-5738:
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Summary: Drill query takes 10+ minutes before start executing,
excessive Hive metastore queries
Key: DRILL-5738
URL: https://issues.apache.org/jira/browse/DRILL-5738
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.6.0
Environment: mapr 5.2
Reporter: kevin zou
Priority: Critical
I ve a Drill query on 14 tables in Hive. The query took a few seconds to
execute. However, the query would stay in "Starting" state for 10+ minutes
before execution.
I set up the log to "Debug" mode to figure out what Drill had been doing during
the 10+ minutes, only to find out Drill generated excessive number of meta data
queries to hive meta store.
Although each query took a few micro seconds (meta data cached in memory), the
number of queries was 3438793.
drillbit.log:2017-06-05 18:50:57,201
[26ca5bda-5e87-475a-cd93-17c6957cc3ee:foreman] DEBUG
o.a.d.e.s.hive.HiveMetadataProvider
- Took 4 µs to get stats from idm_intel_1x.lu_jde_emp_directory
drillbit.log:2017-06-05 18:50:57,201
[26ca5bda-5e87-475a-cd93-17c6957cc3ee:foreman] DEBUG
o.a.drill.exec.store.hive.HiveScan
- HiveStats: numRows: 15, sizeInBytes: 15
........
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