Jiajun Jiang created HDFS-15913:
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Summary: Remove useless NULL checks before instanceof
Key: HDFS-15913
URL: https://issues.apache.org/jira/browse/HDFS-15913
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Jiajun Jiang
Remove useless NULL checks before instanceof in several classes.
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