[HDFS-2553] BlockPoolSliceScanner spinning in loop

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.0, 2.0.0-alpha
• Fix Version/s: 0.23.1
• Component/s: datanode
• Target Version/s: 0.23.1
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Todd Lipcon
• Created: 14/Nov/11 23:12
• Updated: 10/Mar/15 04:36
• Resolved: 18/Dec/11 01:13

Description

Playing with trunk, I managed to get a DataNode in a situation where the BlockPoolSliceScanner is spinning in the following loop, using 100% CPU:
at org.apache.hadoop.hdfs.server.datanode.DataNode$BPOfferService.isAlive(DataNode.java:820)
at org.apache.hadoop.hdfs.server.datanode.DataNode.isBPServiceAlive(DataNode.java:2962)
at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.scan(BlockPoolSliceScanner.java:625)
at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.scanBlockPoolSlice(BlockPoolSliceScanner.java:614)
at org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.run(DataBlockScanner.java:95)