guo created HDFS-16277:
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Summary: improve decision in AvailableSpaceBlockPlacementPolicy
Key: HDFS-16277
URL: https://issues.apache.org/jira/browse/HDFS-16277
Project: Hadoop HDFS
Issue Type: Improvement
Components: block placement
Affects Versions: 3.3.1
Reporter: guo
Hi
In product environment,we may meet two or more datanode usage reaches nealy
100%,for exampe 99.99%,98%,97%.
if we configure `AvailableSpaceBlockPlacementPolicy` , we also have the chance
to choose the 99.99%(assume it is the highest usage),for we treat the two
choosen datanode as the same usage if their storage usage are different within
5%.
but this is not what we want, so i suggest we can improve the decision.
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