[HDFS-10245] Fix the findbug warnings in branch-2.7

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.2
• Fix Version/s: 2.7.3
• Target Version/s: 2.7.3
• Hadoop Flags: Reviewed
• Assignee: Brahma Reddy Battula
• Reporter: Brahma Reddy Battula
• Created: 01/Apr/16 14:45
• Updated: 25/Aug/16 23:00
• Resolved: 25/Apr/16 13:06

Description

Link

https://builds.apache.org/job/PreCommit-HDFS-Build/15036/artifact/patchprocess/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html

Following seen in HDFS-9917 jenkins run.

Code	Warning
IS	Inconsistent synchronization of org.apache.hadoop.hdfs.DFSOutputStream.streamer; locked 85% of time
Bug type IS2_INCONSISTENT_SYNC (click for details) 
In class org.apache.hadoop.hdfs.DFSOutputStream
Field org.apache.hadoop.hdfs.DFSOutputStream.streamer
Synchronized 85% of the time
Unsynchronized access at DFSOutputStream.java:[line 2372]
Unsynchronized access at DFSOutputStream.java:[line 2390]
Unsynchronized access at DFSOutputStream.java:[line 1722]
Synchronized access at DFSOutputStream.java:[line 2178]
Synchronized access at DFSOutputStream.java:[line 2100]
Synchronized access at DFSOutputStream.java:[line 2103]
Synchronized access at DFSOutputStream.java:[line 2264]
Synchronized access at DFSOutputStream.java:[line 1555]
Synchronized access at DFSOutputStream.java:[line 1558]
Synchronized access at DFSOutputStream.java:[line 2166]
Synchronized access at DFSOutputStream.java:[line 2208]
Synchronized access at DFSOutputStream.java:[line 2216]
Synchronized access at DFSOutputStream.java:[line 2209]
Synchronized access at DFSOutputStream.java:[line 2216]
Synchronized access at DFSOutputStream.java:[line 2037]
Synchronized access at DFSOutputStream.java:[line 2037]
Synchronized access at DFSOutputStream.java:[line 2038]
Synchronized access at DFSOutputStream.java:[line 2062]
Synchronized access at DFSOutputStream.java:[line 2063]
Synchronized access at DFSOutputStream.java:[line 2355]