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From Sameer Babu K K <sameer...@yahoo.com.INVALID>
Subject OperationConflictException The operation with nonce may have already completed
Date Tue, 08 Sep 2015 18:02:18 GMT
I am sporadically getting OperationConflictException for individual increment operations. The
version of HBase is 0.98.6-cdh5.2.1. Around 200 threads are writing to the same table. Some
of the threads may be trying to put many values and increment columns. 

Tried different combinations like separating puts and increments in different batches, sending
individual increments etc. But none of these helps. Also noticed that whenever puts contain
many columns (> 30) it happens. I used to have 4 columns before and didn't see this issue

org.apache.hadoop.hbase.exceptions.OperationConflictException: org.apache.hadoop.hbase.exceptions.OperationConflictException:
The operation with nonce {6276654920751931456, 1349555467801158147} on row [aDM^@^@^@^@^@^@^@a^@^@^@^@^@'?^@201408080000008||????D?A
?] may have already completed
        at org.apache.hadoop.hbase.regionserver.HRegionServer.startNonceOperation(HRegionServer.java:4331)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.increment(HRegionServer.java:4295)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.mutate(HRegionServer.java:2986)
        at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29585)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2031)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:108)
        at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:114)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:94)
        at java.lang.Thread.run(Thread.java:744)

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