[HBASE-18212] In Standalone mode with local filesystem HBase logs Warning message:Failed to invoke 'unbuffer' method in class class org.apache.hadoop.fs.FSDataInputStream

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.4.0, 2.0.0
• Fix Version/s: 1.4.0, 1.3.2, 2.0.0-alpha-2, 1.1.12, 2.0.0, 1.2.7
• Component/s: Operability
• Assignee: Ashish Singhi
• Reporter: Umesh Agashe
• Created: 13/Jun/17 18:29
• Updated: 01/Aug/18 06:23
• Resolved: 20/Jun/17 16:21

Description

New users may get nervous after seeing following warning level log messages (considering new users will most likely run HBase in Standalone mode first):

WARN  [MemStoreFlusher.1] io.FSDataInputStreamWrapper: Failed to invoke 'unbuffer' method in class class org.apache.hadoop.fs.FSDataInputStream . So there may be a TCP socket connection left open in CLOSE_WAIT state.

Issue Links

• relates to: HBASE-9393 Region Server fails to properly close socket resulting in many CLOSE_WAIT to Data Nodes