guo created HDFS-16340:
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Summary: improve diskbalancer error message
Key: HDFS-16340
URL: https://issues.apache.org/jira/browse/HDFS-16340
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Affects Versions: 3.3.1
Reporter: guo
during disk balance ,when we cannot get json from item ,only `Unable to get
json from Item.` will be recorded, but no real exception message printed, we
can improve it.
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