[TRAFODION-2348] TransactionState.hasConflict returns true if it gets a null pointer exception

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.1-incubating, any
• Fix Version/s: 2.4
• Component/s: dtm
• Assignee: Sean Broeder
• Reporter: Sean Broeder
• Created: 09/Nov/16 20:24
• Updated: 16/Apr/20 02:19

Description

In the middle of hasConflict the TransactionState object compares its writeOrder list to various other transactions. In this case, we get a Null pointer exception in the trasnaction to check against, so we return true to has conflict and the transaction aborts.

2016-11-07 20:00:28,673 WARN org.apache.hadoop.hbase.regionserver.transactional.TransactionState: TrxTransactionState hasConflict:
Unable to get row - this Transaction [[transactionId: 12919375954 regionTX: false status: PENDING neverReadOnly: false scan Size: 28 write Size: 14 startSQ: 34310]]
checkAgainst Transaction [[transactionId: 17214542234 regionTX: false status: ABORTED neverReadOnly: false scan Size: 0 write Size: 0 startSQ: 34296 commitedSQ:34314]] Exception:
java.lang.NullPointerException
at org.apache.hadoop.hbase.regionserver.transactional.TrxTransactionState.hasConflict(TrxTransactionState.java:469)
at org.apache.hadoop.hbase.regionserver.transactional.TrxTransactionState.hasConflict(TrxTransactionState.java:438)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.hasConflict(TrxRegionEndpoint.java:6389)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.commitRequest(TrxRegionEndpoint.java:6138)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.commitRequest(TrxRegionEndpoint.java:6077)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.commitRequest(TrxRegionEndpoint.java:894)
at org.apache.hadoop.hbase.coprocessor.transactional.generated.TrxRegionProtos$TrxRegionService.callMethod(TrxRegionProtos.java:49510)
at org.apache.hadoop.hbase.regionserver.HRegion.execService(HRegion.java:7054)
at org.apache.hadoop.hbase.regionserver.RSRpcServices.execServiceOnRegion(RSRpcServices.java:1746)
at org.apache.hadoop.hbase.regionserver.RSRpcServices.execService(RSRpcServices.java:1728)
at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:31447)
at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2035)
at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
at java.lang.Thread.run(Thread.java:745)

2016-11-07 20:00:28,674 ERROR org.apache.hadoop.hbase.regionserver.transactional.TransactionState: TrxTransactionState hasConflict:
Returning true. This transaction [transactionId: 12919375954 regionTX: false status: PENDING neverReadOnly: false scan Size: 28 write Size: 14 startSQ: 34310] Caught exception from transaction [transactionId: 17214542234 regionTX: false status: ABORTED neverReadOnly: false scan Size: 0 write Size: 0 startSQ: 34296 commitedSQ:34314], regionInfo is [TRAFODION.JAVABENCH.OE_ORDERLINE_192,\x00\x00\x00\x1D\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1478575978122.228b0109fcab4c57c25d7f1326f40f4e.], exception
java.lang.NullPointerException
at org.apache.hadoop.hbase.regionserver.transactional.TrxTransactionState.hasConflict(TrxTransactionState.java:469)
at org.apache.hadoop.hbase.regionserver.transactional.TrxTransactionState.hasConflict(TrxTransactionState.java:438)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.hasConflict(TrxRegionEndpoint.java:6389)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.commitRequest(TrxRegionEndpoint.java:6138)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.commitRequest(TrxRegionEndpoint.java:6077)
at org.apache.hadoop.hbase.coprocessor.transactional.TrxRegionEndpoint.commitRequest(TrxRegionEndpoint.java:894)
at org.apache.hadoop.hbase.coprocessor.transactional.generated.TrxRegionProtos$TrxRegionService.callMethod(TrxRegionProtos.java:49510)
at org.apache.hadoop.hbase.regionserver.HRegion.execService(HRegion.java:7054)
at org.apache.hadoop.hbase.regionserver.RSRpcServices.execServiceOnRegion(RSRpcServices.java:1746)
at org.apache.hadoop.hbase.regionserver.RSRpcServices.execService(RSRpcServices.java:1728)
at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:31447)
at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2035)
at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
at java.lang.Thread.run(Thread.java:745)