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 then.
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)
