[HDFS-6040] fix DFSClient issue without libhadoop.so and some other ShortCircuitShm cleanups

• Type: Sub-task
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.4.0
• Component/s: hdfs-client
• Target Version/s: 2.4.0
• Assignee: Colin P. McCabe
• Reporter: Colin P. McCabe
• Created: 03/Mar/14 19:27
• Updated: 10/Apr/14 13:11
• Resolved: 04/Mar/14 20:24

Description

• clean up some extra imports in ShortCircuitShm
• fix or suppress bogus findbugs warnings
• throw an IOException rather than RuntimeException when the client asks the server for a bogus slot index.
• fix an issue where DFSClients got an exception when libhadoop.so was not available
• adjust some noisy INFO log messages downward

Issue Links

• breaks: HDFS-6051 HDFS cannot run on Windows since short-circuit shared memory segment changes.
• duplicates: HDFS-6048 DFSClient fails if native library doesn't exist
• relates to: HDFS-5950 The DFSClient and DataNode should use shared memory segments to communicate short-circuit information