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Posted to dev@hive.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2014/05/13 05:03:14 UTC

[jira] [Created] (HIVE-7052) Optimize split calculation time

Rajesh Balamohan created HIVE-7052:
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             Summary: Optimize split calculation time
                 Key: HIVE-7052
                 URL: https://issues.apache.org/jira/browse/HIVE-7052
             Project: Hive
          Issue Type: Bug
         Environment: hive + tez
            Reporter: Rajesh Balamohan
            Assignee: Rajesh Balamohan


When running a TPC-DS query (query_27),  significant amount of time was spent in split computation on a dataset of size 200 GB (ORC format).

Profiling revealed that, 
1. Lot of time was spent in Config's subtitutevar (regex) in HiveInputFormat.getSplits() method.  
2. FileSystem was created repeatedly in OrcInputFormat.generateSplitsInfo(). 

I will attach the profiler snapshots soon.



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