Tsz Wo Nicholas Sze created HDFS-8283:
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             Summary: DataStreamer cleanup and some minor improvement
                 Key: HDFS-8283
                 URL: https://issues.apache.org/jira/browse/HDFS-8283
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Tsz Wo Nicholas Sze
            Priority: Minor


- When throwing an exception
-* always set lastException 
-* always creating a new exception so that it has the new stack trace
- Add LOG.
- Add final to isAppend and favoredNodes



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