[HBASE-17211] Add more details in log when UnknownScannerException thrown in ScannerCallable

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.4.0, 0.98.24, 2.0.0
• Component/s: Operability
• Hadoop Flags: Reviewed
• Assignee: Yu Li
• Reporter: Yu Li
• Created: 30/Nov/16 15:56
• Updated: 13/May/17 20:44
• Resolved: 30/Nov/16 17:42

Description

Currently if we try to close an already closed scanner, we may see below warning log which is useless for debugging:

2016-06-23 01:21:21,101 WARN [main] org.apache.hadoop.hbase.client.ScannerCallable: Ignore, probably already closed
org.apache.hadoop.hbase.UnknownScannerException: org.apache.hadoop.hbase.UnknownScannerException: Name: 18706910, already closed?
    at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2304)
    at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32205)
    at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2188)
    at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:102)
    at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
    at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)

and here we propose to add more details about the scan in log.

Issue Links

• relates to: HBASE-17212 Should add null checker on table name in HTable constructor and RegionServerCallable