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https://issues.apache.org/jira/browse/TEZ-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hitesh Shah updated TEZ-3330:
-----------------------------
    Labels: newbie  (was: )

> Error on avro M/R job with Tez: missing configuration property
> --------------------------------------------------------------
>
>                 Key: TEZ-3330
>                 URL: https://issues.apache.org/jira/browse/TEZ-3330
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Manuel Godbert
>              Labels: newbie
>         Attachments: TEZ-3330.temp.2.patch, TEZ-3330.temp.patch
>
>
> I tried running the simple avro M/R job MapredColorCount, that I found in the 
> examples of avro release 1.7.7.
> It failed with the following trace:
> {code}
> errorMessage=Shuffle Runner 
> Failed:org.apache.tez.runtime.library.common.shuffle.orderedgrouped.Shuffle$ShuffleError:
>  Error while doing final merge
>         at 
> org.apache.tez.runtime.library.common.shuffle.orderedgrouped.Shuffle$RunShuffleCallable.callInternal(Shuffle.java:378)
>         at 
> org.apache.tez.runtime.library.common.shuffle.orderedgrouped.Shuffle$RunShuffleCallable.callInternal(Shuffle.java:337)
>         at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at java.lang.Thread.run(Thread.java:744)
> Caused by: java.lang.NullPointerException
>         at java.io.StringReader.<init>(StringReader.java:50)
>         at org.apache.avro.Schema$Parser.parse(Schema.java:917)
>         at org.apache.avro.Schema.parse(Schema.java:966)
>         at org.apache.avro.mapred.AvroJob.getMapOutputSchema(AvroJob.java:78)
>         at 
> org.apache.avro.mapred.AvroKeyComparator.setConf(AvroKeyComparator.java:39)
>         at 
> org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:76)
>         at 
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:136)
>         at 
> org.apache.tez.runtime.library.common.ConfigUtils.getIntermediateInputKeyComparator(ConfigUtils.java:133)
>         at 
> org.apache.tez.runtime.library.common.shuffle.orderedgrouped.MergeManager.finalMerge(MergeManager.java:915)
>         at 
> org.apache.tez.runtime.library.common.shuffle.orderedgrouped.MergeManager.close(MergeManager.java:540)
>         at 
> org.apache.tez.runtime.library.common.shuffle.orderedgrouped.Shuffle$RunShuffleCallable.callInternal(Shuffle.java:376)
>         ... 6 more
> {code}
> Digging a bit I saw that during shuffle Tez can't access some of the 
> configuration properties of the job. In our example it is the 
> avro.output.schema that is missing.
> With some more complicated code I could get one step further and a similar 
> issue happened when the valuesIterator for the reducer was being built:
> {code}
> java.lang.NullPointerException
> at java.io.StringReader.<init>(StringReader.java:50)
> at org.apache.avro.Schema$Parser.parse(Schema.java:917)
> at org.apache.avro.Schema.parse(Schema.java:966)
> at org.apache.avro.mapred.AvroJob.getMapOutputSchema(AvroJob.java:78)
> at 
> org.apache.avro.mapred.AvroSerialization.getDeserializer(AvroSerialization.java:53)
> at 
> org.apache.hadoop.io.serializer.SerializationFactory.getDeserializer(SerializationFactory.java:90)
> at 
> org.apache.tez.runtime.library.common.ValuesIterator.<init>(ValuesIterator.java:80)
> at 
> org.apache.tez.runtime.library.input.OrderedGroupedKVInput.createValuesIterator(OrderedGroupedKVInput.java:287)
> {code}
> I am using HDP2.4, Tez 0.7.0, avro 1.7.4



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