Mostafa Mokhtar created IMPALA-6403:
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Summary: Enable file handle re-use for multiple scan ranges within
the same file for an HDFS Scan node
Key: IMPALA-6403
URL: https://issues.apache.org/jira/browse/IMPALA-6403
Project: IMPALA
Issue Type: Improvement
Reporter: Mostafa Mokhtar
Assignee: Joe McDonnell
Impala creates a file handle per scan range, for queries that read multiple
columns per scan range un-necessarily large load is added to the HDFS NameNode
which limits scalability on large clusters.
For a given set of scan ranges against a file within a Scan Node a single file
handle should be created an reused to avoid excessive RPCs.
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