JackYan created HIVE-25615:
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Summary: Hive on tez will generate at least one MapContainer per 0
length file
Key: HIVE-25615
URL: https://issues.apache.org/jira/browse/HIVE-25615
Project: Hive
Issue Type: Improvement
Components: Query Planning, Query Processor, Tez
Affects Versions: 3.1.2
Environment: hive-3.1.2
tez-0.10.1
Reporter: JackYan
When tez read a table with many partitions and those partitions contain 0
length file only, ColumnarSplitSizeEstimator will return Integer.MAX_VALUE
bytes length for every 0 length file.Then,TezSplitGrouper will treat those
files as big files,and generate at least one MapContainer per 0 file to handle
it.This is incorrect and even wasteful.
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