Hive can use CombineFileInputFormat for when the input are many small files
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Key: HIVE-74
URL: https://issues.apache.org/jira/browse/HIVE-74
Project: Hadoop Hive
Issue Type: Improvement
Reporter: dhruba borthakur
Assignee: dhruba borthakur
Fix For: 0.20.0
There are cases when the input to a Hive job are thousands of small files. In
this case, there is a mapper for each file. Most of the overhead for spawning
all these mappers can be avoided if Hive used CombineFileInputFormat introduced
via HADOOP-4565
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