[HDFS-8283] DataStreamer cleanup and some minor improvement

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: hdfs-client
• Hadoop Flags: Reviewed
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 29/Apr/15 00:39
• Updated: 30/Aug/16 01:35
• Resolved: 29/Apr/15 17:45

Description

• 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

Issue Links

• breaks: HDFS-8300 Fix unit test failures and findbugs warning caused by HDFS-8283