Raghav Aggarwal created HIVE-29307:
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Summary: Incorrect split calculation causing less container to
launch
Key: HIVE-29307
URL: https://issues.apache.org/jira/browse/HIVE-29307
Project: Hive
Issue Type: Bug
Affects Versions: 4.0.1, 4.1.0, 4.0.0
Reporter: Raghav Aggarwal
Assignee: Raghav Aggarwal
[https://github.com/apache/hive/blob/6b5febcc559e9f20ebea6fb04679477cf125144f/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/HiveSplitGenerator.java#L363]
{code:java}
splits = inputFormat.getSplits(jobConf,
numSplits.orElse(Math.multiplyExact(availableSlots, (int)waves))); {code}
*Type casting of waves i.e. from float to int is causing less number of
container launch*
As good value of waves should be 1.7, 2.7, 3.7 etc as per
[https://github.com/apache/tez/blob/5775337a5be3993d1aeb9b4c39134fe96c9b39f2/tez-mapreduce/src/main/java/org/apache/tez/mapreduce/grouper/TezSplitGrouper.java#L62]
This incorrect calcutation will interfere with the
org.apache.tez.mapreduce.grouper.TezSplitGrouper class.
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