Brandon Li created HDFS-4920:
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Summary: ClientNamenodeProtocolServerSideTranslatorPB.addBlock()
should check if fileId exists for backword compatibility support
Key: HDFS-4920
URL: https://issues.apache.org/jira/browse/HDFS-4920
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Brandon Li
Instead of calling req.getFileId(), it should check if fileId presents,
req.hasFileId() first.
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