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From Anoop John <anoop.hb...@gmail.com>
Subject Re: HBase 0.98.1 batch Increment throws OperationConflictException
Date Wed, 17 Sep 2014 10:14:16 GMT
This is an improvement (rather an issue fix) done from 0.98+ versions.
This is for non-idempotent operations (like increment) which HBase clients
might retry on failure.  Such retry can give wrong results (possibly
incrementing 2 times for one increment op)

Can you change your application side code so as to avoid possible multiple
increment for same keys in one batch. Those can be combined to one
increment.

You can turn off this improvement using config "hbase.client.nonces.enabled"
(Configure at client side xml file). But this is not a recommended way.  U
can check with this.

-Anoop-


On Wed, Sep 17, 2014 at 1:04 PM, Vin Gup <vingup2005@yahoo.com.invalid>
wrote:

> Yes possibly. Why would that be a problem?
> Earlier client (0.94) didn't complain about it.
>
> Thanks,
> -Vinay
>
> > On Sep 17, 2014, at 12:16 AM, Anoop John <anoop.hbase@gmail.com> wrote:
> >
> > You have more than one increment for the same key in one batch?
> >
> > On Wed, Sep 17, 2014 at 12:33 PM, Vinay Gupta
> <vingup2005@yahoo.com.invalid>
> > wrote:
> >
> >> Also the regionserver keeps throwing exceptions like
> >>
> >> 2014-09-17 06:56:07,151 DEBUG [RpcServer.handler=10,port=60020]
> >> regionserver.ServerNonceManager: Conflict detected by nonce:
> >> [43871278468062569
> >> 89:2793719453824938427], [state 0, hasWait false, activity 06:55:41.091]
> >> 2014-09-17 06:56:07,151 DEBUG [RpcServer.handler=10,port=60020]
> >> regionserver.ServerNonceManager: Conflict detected by nonce:
> >> [43871278468062569
> >> 89:843474753753473839], [state 0, hasWait false, activity 06:55:41.094]
> >>
> >>
> >> Are we sending data too fast? Is there a client side setting or a server
> >> side setting we need to look at to alleviate this?
> >> Again this was never a problem with HBase 0.94 cluster.
> >>
> >> We are calling the batch API in a List<> of 1000 increment and we do
> >> approx 30000 Increments (30 batches) at a time.
> >>
> >>
> >> -Vinay
> >>
> >>
> >> On Sep 16, 2014, at 11:24 PM, Vinay Gupta <vingup2005@yahoo.com.INVALID
> >
> >> wrote:
> >>
> >>>
> >>>>
> >>>> Hi,
> >>>> We are using Hbase batch API and with 0.98.1 we get the following
> >> exception on using batch() with Increment
> >>>> ————————————
> >>>> org.apache.hadoop.hbase.exceptions.OperationConflictException: The
> >> operation with nonce {5266048044724982303, 5395957753774586342} on row
> >> [rowkey13-20140331] may have already completed
> >>>>     at
> >>
> org.apache.hadoop.hbase.regionserver.HRegionServer.startNonceOperation(HRegionServer.java:4199)
> >>>>     at
> >>
> org.apache.hadoop.hbase.regionserver.HRegionServer.increment(HRegionServer.java:4163)
> >>>>     at
> >>
> org.apache.hadoop.hbase.regionserver.HRegionServer.doNonAtomicRegionMutation(HRegionServer.java:3424)
> >>>>     at
> >>
> org.apache.hadoop.hbase.regionserver.HRegionServer.multi(HRegionServer.java:3359)
> >>>>     at
> >>
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29503)
> >>>>     at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2012)
> >>>>     at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:98)
> >>>>     at
> >>
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcScheduler.java:160)
> >>>>     at
> >>
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcScheduler.java:38)
> >>>>     at
> >>
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler.java:110)
> >>>>     at java.lang.Thread.run(Thread.java:745)
> >>>> ————————————
> >>>> Eventually the job fails with
> >>>> "Error:
> >> org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException"
> >>>>
> >>>> The same job works in Hbase 0.94 installation. Any tips on which
> config
> >> settings to play with to resolve this?
> >>>> Is the application supposed to handle these exceptions? (something new
> >> in Hbase 0.98 or 0.96 ??)
> >>>>
> >>>> Thanks,
> >>>> -Vinay
> >>
> >>
>

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