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https://issues.apache.org/jira/browse/MAPREDUCE-4950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910215#comment-13910215
 ] 

Rohith commented on MAPREDUCE-4950:
-----------------------------------

In my cluster Hadoop-2.3, I too encounterd with similar 
exception.JobHistoryEvents write  failed. I am not pretty sure what is cause 
for the reason.:-(

{noformat}
2014-02-21 22:10:33,841 INFO [Thread-355] 
org.apache.hadoop.service.AbstractService: Service JobHistoryEventHandler 
failed in state STOPPED; cause: org.apache.avro.AvroTypeException: Attempt to 
process a enum when a string was expected.
org.apache.avro.AvroTypeException: Attempt to process a enum when a string was 
expected.
                at org.apache.avro.io.parsing.Parser.advance(Parser.java:93)
                at 
org.apache.avro.io.JsonEncoder.writeEnum(JsonEncoder.java:217)
                at 
org.apache.avro.specific.SpecificDatumWriter.writeEnum(SpecificDatumWriter.java:54)
                at 
org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:67)
                at 
org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:106)
                at 
org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:66)
                at 
org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:58)
                at 
org.apache.hadoop.mapreduce.jobhistory.EventWriter.write(EventWriter.java:66)
                at 
org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler$MetaInfo.writeEvent(JobHistoryEventHandler.java:870)
                at 
org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.handleEvent(JobHistoryEventHandler.java:517)
                at 
org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.serviceStop(JobHistoryEventHandler.java:332)
                at 
org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
                at 
org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
                at 
org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
                at 
org.apache.hadoop.service.CompositeService.stop(CompositeService.java:159)
                at 
org.apache.hadoop.service.CompositeService.serviceStop(CompositeService.java:132)
                at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStop(MRAppMaster.java:1386)
                at 
org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
                at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.shutDownJob(MRAppMaster.java:550)
                at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster$JobFinishEventHandler$1.run(MRAppMaster.java:602)
{noformat}

> MR App Master fails to write the history due to AvroTypeException
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-4950
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4950
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver, mr-am
>            Reporter: Devaraj K
>            Priority: Critical
>
> {code:xml}
> 2013-01-19 19:31:27,269 INFO [AsyncDispatcher event handler] 
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler: In stop, 
> writing event MAP_ATTEMPT_STARTED
> 2013-01-19 19:31:27,269 INFO [AsyncDispatcher event handler] 
> org.apache.hadoop.yarn.service.CompositeService: Error stopping 
> JobHistoryEventHandler
> org.apache.avro.AvroTypeException: Attempt to process a enum when a 
> array-start was expected.
>       at org.apache.avro.io.parsing.Parser.advance(Parser.java:93)
>       at org.apache.avro.io.JsonEncoder.writeEnum(JsonEncoder.java:210)
>       at 
> org.apache.avro.specific.SpecificDatumWriter.writeEnum(SpecificDatumWriter.java:54)
>       at 
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:66)
>       at 
> org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:104)
>       at 
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:65)
>       at 
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:57)
>       at 
> org.apache.hadoop.mapreduce.jobhistory.EventWriter.write(EventWriter.java:66)
>       at 
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler$MetaInfo.writeEvent(JobHistoryEventHandler.java:825)
>       at 
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.handleEvent(JobHistoryEventHandler.java:517)
>       at 
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.stop(JobHistoryEventHandler.java:346)
>       at 
> org.apache.hadoop.yarn.service.CompositeService.stop(CompositeService.java:99)
>       at 
> org.apache.hadoop.yarn.service.CompositeService.stop(CompositeService.java:89)
>       at 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$JobFinishEventHandler.handle(MRAppMaster.java:445)
>       at 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$JobFinishEventHandler.handle(MRAppMaster.java:406)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:126)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:75)
>       at java.lang.Thread.run(Thread.java:662)
> 2013-01-19 19:31:27,271 INFO [AsyncDispatcher event handler] 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Deleting staging directory 
> hdfs://hacluster /root/staging-dir/root/.staging/job_1358603069474_0135
> {code}



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