Roman Leventov created HADOOP-15985:
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Summary: LightWeightGSet.computeCapacity() doesn't correctly
account for CompressedOops
Key: HADOOP-15985
URL: https://issues.apache.org/jira/browse/HADOOP-15985
Project: Hadoop Common
Issue Type: Improvement
Reporter: Roman Leventov
In this line:
[https://github.com/apache/hadoop/blob/a55d6bba71c81c1c4e9d8cd11f55c78f10a548b0/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/LightWeightGSet.java#L391],
instead of checking if the platform is 32- or 64-bit, it should check if
Unsafe.ARRAY_OBJECT_INDEX_SCALE is 4 or 8.
The result is that on 64-bit platforms, when Compressed Oops are on,
LightWeightGSet is two times denser than it is configured to be.
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