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From Arun Mishra <arunmis...@me.com>
Subject Re: Query on OutOfOrderScannerNextException
Date Sat, 06 Jun 2015 22:04:16 GMT
Thanks TED.

Regards,
Arun.

> On Jun 6, 2015, at 2:34 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> 
> HBASE-13090 'Progress heartbeats for long running scanners' solves the
> problem you faced.
> 
> It is in the 1.1.0 release.
> 
> FYI
> 
>> On Sat, Jun 6, 2015 at 12:54 PM, Arun Mishra <arunmishra@me.com> wrote:
>> 
>> Hello,
>> 
>> I have a query on OutOfOrderScannerNextException. I am using hbase 0.98.6
>> with 45 nodes.
>> 
>> I have a mapreduce job which scan 1 table for last 1 day worth data using
>> timerange. It has been running fine for months without any failure. But
>> last couple of days it has been failing with below exception. I have traced
>> the failure to a single region. This region has 1 store and 1 hfile of
>> 5+GB. What we realized was that, we were writing some bulk data, which used
>> to land on this region. After we stopped writing this data, this region has
>> been receiving very few writes per day.
>> 
>> When mapreduce job runs, it creates a map task for this region and that
>> task fails with OutOfOrderScannerNextException. I was able to reproduce
>> this error by running a scan command with same start/stop row and timerange
>> option. Finally, we split this region to be small enough for scan command
>> to work.
>> 
>> My query is if there is any option, apart from increasing the timeout,
>> which can solve this use case? I am thinking of a use case where data comes
>> in for 3 days a week in bulk and then nothing for next 3 days. Kind of
>> creating a data hole in region.
>> My understanding is that I am hit with this error because I have big store
>> files and timerange scan is reading entire file even though it contains
>> very few rowkeys for that timerange.
>> 
>> hbase.client.scanner.caching = 100
>> hbase.client.scanner.timeout.period = 60s
>> 
>> scan 'dummytable',{ STARTROW=>'dummyrowkey-start',
>> STOPROW=>'dummyrowkey-end', LIMIT=>1000,
>> TIMERANGE=>[1433462400000,1433548800000]}
>> ROW                                           COLUMN+CELL
>> 
>> ERROR: org.apache.hadoop.hbase.exceptions.OutOfOrderScannerNextException:
>> Expected nextCallSeq: 1 But the nextCallSeq got from client: 0;
>> request=scanner_id: 33648 number_of_rows: 100 close_scanner: false
>> next_call_seq: 0
>> at
>> org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3193)
>> at
>> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29587)
>> 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:745)
>> 
>> 
>> Regards,
>> Arun

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