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From "M, Paul" <pa...@iqt.org>
Subject Re: Avro and Oozie Map Reduce action
Date Tue, 19 Mar 2013 18:20:28 GMT
Thanks. That worked!



On Mar 18, 2013, at 10:26 PM, Harsh J <harsh@cloudera.com>
 wrote:

> The value you're specifying for io.serializations below is incorrect:
> 
> <property>
> <name>io.serializations</name>
> <value>org.apache.avro.mapred.AvroSerialization,
> avro.serialization.key.reader.schema,
> avro.serialization.value.reader.schema,
> avro.serialization.key.writer.schema,avro.serialization.value.writer.schema
> </value>
> </property>
> 
> If the goal is to include org.apache.avro.mapred.AvroSerialization,
> then it should look more like:
> 
> <property>
>  <name>io.serializations</name>
>  <value>org.apache.hadoop.io.serializer.WritableSerialization,org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization,org.apache.hadoop.io.serializer.avro.AvroReflectSerialization,org.apache.avro.mapred.AvroSerialization</value>
> </property>
> 
> That is, it must be an extension of the default values, and not a
> replacement of them.
> 
> On Wed, Mar 13, 2013 at 4:05 AM, M, Paul <paulm@iqt.org> wrote:
>> Hello,
>> 
>> I am trying to run an M/R job with Avro serialization via Oozie.  I've made
>> some progress in the workflow.xml, however I am still running into the
>> following error.  Any thoughts?  I believe it may have to do with the
>> io.serializations property below.   FYI, I am using CDH 4.2.0 mr1.
>> 
>> 2013-03-12 15:24:32,334 INFO org.apache.hadoop.mapred.TaskInProgress: Error
>> from attempt_201303111118_0080_m_000000_3: java.lang.NullPointerException
>> at org.apache.hadoop.mapred.MapTask.getSplitDetails(MapTask.java:356)
>> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:389)
>> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:333)
>> at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at javax.security.auth.Subject.doAs(Subject.java:396)
>> at
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1407)
>> at org.apache.hadoop.mapred.Child.main(Child.java:262)
>> 
>> 
>> <action name="mr-node">
>> <map-reduce>
>> <job-tracker>${jobTracker}</job-tracker>
>> <name-node>${nameNode}</name-node>
>> <prepare>
>> <delete path="${nameNode}/user/${wf:user()}/${outputDir}" />
>> </prepare>
>> <configuration>
>> <property>
>> <name>mapred.job.queue.name</name>
>> <value>${queueName}</value>
>> </property>
>> 
>> <property>
>> <name>mapreduce.reduce.class</name>
>> <value>org.apache.avro.mapred.HadoopReducer</value>
>> </property>
>> <property>
>> <name>mapreduce.map.class</name>
>> <value>org.apache.avro.mapred.HadoopMapper</value>
>> </property>
>> 
>> 
>> <property>
>> <name>avro.reducer</name>
>> <value>org.my.project.mapreduce.CombineAvroRecordsByHourReducer
>> </value>
>> </property>
>> 
>> <property>
>> <name>avro.mapper</name>
>> <value>org.my.project.mapreduce.ParseMetadataAsTextIntoAvroMapper
>> </value>
>> </property>
>> 
>> 
>> <property>
>> <name>mapreduce.inputformat.class</name>
>> <value>org.my.project.mapreduce.NonSplitableInputFormat</value>
>> </property>
>> 
>> <!-- Key Value Mapper -->
>> <property>
>> <name>avro.output.schema</name>
>> <value>{"type":"record","name":"Pair","namespace":"org.apache.avro.mapred","fields":..."}]}
>> </value>
>> </property>
>> <property>
>> <name>mapred.mapoutput.key.class</name>
>> <value>org.apache.avro.mapred.AvroKey</value>
>> </property>
>> <property>
>> <name>mapred.mapoutput.value.class</name>
>> <value>org.apache.avro.mapred.AvroValue</value>
>> </property>
>> 
>> 
>> <property>
>> <name>avro.schema.output.key</name>
>> <value>{"type":"record","name":"DataRecord","namespace":...]}]}
>> </value>
>> </property>
>> 
>> <property>
>> <name>mapreduce.outputformat.class</name>
>> <value>org.apache.hadoop.mapreduce.lib.output.TextOutputFormat
>> </value>
>> </property>
>> 
>> <property>
>> <name>mapred.output.key.comparator.class</name>
>> <value>org.apache.avro.mapred.AvroKeyComparator</value>
>> </property>
>> 
>> <property>
>> <name>io.serializations</name>
>> <value>org.apache.avro.mapred.AvroSerialization,
>> avro.serialization.key.reader.schema,
>> avro.serialization.value.reader.schema,
>> avro.serialization.key.writer.schema,avro.serialization.value.writer.schema
>> </value>
>> </property>
>> 
>> <property>
>> <name>mapred.map.tasks</name>
>> <value>1</value>
>> </property>
>> 
>> 
>> 
>> <!--Input/Output -->
>> <property>
>> <name>mapred.input.dir</name>
>> <value>/user/${wf:user()}/input/</value>
>> </property>
>> <property>
>> <name>mapred.output.dir</name>
>> <value>/user/${wf:user()}/${outputDir}</value>
>> </property>
>> </configuration>
>> </map-reduce>
> 
> 
> 
> -- 
> Harsh J


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