Kunal Khatua created DRILL-4706:
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Summary: Fragment planning causes Drillbits to read remote chunks
when local copies are available
Key: DRILL-4706
URL: https://issues.apache.org/jira/browse/DRILL-4706
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.6.0
Environment: CentOS, RHEL
Reporter: Kunal Khatua
When a table (datasize=70GB) of 160 parquet files (each having a single
rowgroup and fitting within one chunk) is available on a 10-node setup with
replication=3 ; a pure data scan query causes about 2% of the data to be read
remotely.
Even with the creation of metadata cache, the planner is selecting a
sub-optimal plan of executing the SCAN fragments such that some of the data is
served from a remote server.
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