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From "Kunal Khatua (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4706) Fragment planning causes Drillbits to read remote chunks when local copies are available
Date Fri, 03 Jun 2016 17:14:59 GMT
Kunal Khatua created DRILL-4706:
-----------------------------------

             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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