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From Stanley Shi <s...@gopivotal.com>
Subject Re: [hadoop] AvroMultipleOutputs org.apache.avro.file.DataFileWriter$AppendWriteException
Date Tue, 04 Mar 2014 01:30:52 GMT
which avro version are you using when running outside of hadoop?

Regards,
*Stanley Shi,*



On Mon, Mar 3, 2014 at 11:49 PM, John Pauley <John.Pauley@threattrack.com>wrote:

>   This is cross posted to avro-user list (
> http://mail-archives.apache.org/mod_mbox/avro-user/201402.mbox/%3cCF3612F6.94D2%25john.pauley@threattrack.com%3e
> ).
>
>   Hello all,
>
>  I’m having an issue using AvroMultipleOutputs in a map/reduce job.  The
> issue occurs when using a schema that has a union of null and a fixed
> (among other complex types), default to null, and it is not null.  Please
> find the full stack trace below and a sample map/reduce job that generates
> an Avro container file and uses that for the m/r input.  Note that I can
> serialize/deserialize without issue using
> GenericDatumWriter/GenericDatumReader outside of hadoop…  Any insight would
> be helpful.
>
>  Stack trace:
>  java.lang.Exception:
> org.apache.avro.file.DataFileWriter$AppendWriteException:
> java.lang.NullPointerException: in com.foo.bar.simple_schema in union null
> of union in field baz of com.foo.bar.simple_schema
> at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:404)
> Caused by: org.apache.avro.file.DataFileWriter$AppendWriteException:
> java.lang.NullPointerException: in com.foo.bar.simple_schema in union null
> of union in field baz of com.foo.bar.simple_schema
> at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:296)
> at
> org.apache.avro.mapreduce.AvroKeyRecordWriter.write(AvroKeyRecordWriter.java:77)
> at
> org.apache.avro.mapreduce.AvroKeyRecordWriter.write(AvroKeyRecordWriter.java:39)
> at
> org.apache.avro.mapreduce.AvroMultipleOutputs.write(AvroMultipleOutputs.java:400)
> at
> org.apache.avro.mapreduce.AvroMultipleOutputs.write(AvroMultipleOutputs.java:378)
> at
> com.tts.ox.mapreduce.example.avro.AvroContainerFileDriver$SampleMapper.map(AvroContainerFileDriver.java:78)
> at
> com.tts.ox.mapreduce.example.avro.AvroContainerFileDriver$SampleMapper.map(AvroContainerFileDriver.java:62)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:140)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:672)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:266)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
> at java.lang.Thread.run(Thread.java:695)
> Caused by: java.lang.NullPointerException: in com.foo.bar.simple_schema in
> union null of union in field baz of com.foo.bar.simple_schema
> at
> org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:145)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:58)
> at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:290)
> ... 16 more
> Caused by: java.lang.NullPointerException
> at org.apache.avro.reflect.ReflectData.createSchema(ReflectData.java:457)
> at org.apache.avro.specific.SpecificData.getSchema(SpecificData.java:189)
> at org.apache.avro.reflect.ReflectData.isRecord(ReflectData.java:167)
> at org.apache.avro.generic.GenericData.getSchemaName(GenericData.java:608)
> at
> org.apache.avro.specific.SpecificData.getSchemaName(SpecificData.java:265)
> at org.apache.avro.generic.GenericData.resolveUnion(GenericData.java:597)
> at
> org.apache.avro.generic.GenericDatumWriter.resolveUnion(GenericDatumWriter.java:151)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:71)
> at
> org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:143)
> at
> org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:114)
> at
> org.apache.avro.reflect.ReflectDatumWriter.writeField(ReflectDatumWriter.java:175)
> at
> org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:104)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:66)
> at
> org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:143)
>
>  Sample m/r job:
> <mr_job>
>  package com.tts.ox.mapreduce.example.avro;
>
>  import org.apache.avro.Schema;
> import org.apache.avro.file.DataFileWriter;
> import org.apache.avro.generic.GenericData;
> import org.apache.avro.generic.GenericDatumWriter;
> import org.apache.avro.generic.GenericRecord;
> import org.apache.avro.generic.GenericRecordBuilder;
> import org.apache.avro.io.DatumWriter;
> import org.apache.avro.mapred.AvroKey;
> import org.apache.avro.mapreduce.AvroJob;
> import org.apache.avro.mapreduce.AvroKeyInputFormat;
> import org.apache.avro.mapreduce.AvroKeyOutputFormat;
> import org.apache.avro.mapreduce.AvroMultipleOutputs;
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.conf.Configured;
> import org.apache.hadoop.fs.Path;
> import org.apache.hadoop.io.NullWritable;
> import org.apache.hadoop.mapreduce.Job;
> import org.apache.hadoop.mapreduce.Mapper;
> import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
> import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
> import org.apache.hadoop.util.GenericOptionsParser;
> import org.apache.hadoop.util.Tool;
> import org.apache.hadoop.util.ToolRunner;
>
>  import java.io.File;
> import java.io.IOException;
>
>  public class AvroContainerFileDriver extends Configured implements Tool {
>     //
>     // define a schema with a union of null and fixed
>     private static final String SCHEMA = "{\n" +
>             "    \"namespace\": \"com.foo.bar\",\n" +
>             "    \"name\": \"simple_schema\",\n" +
>             "    \"type\": \"record\",\n" +
>             "    \"fields\": [{\n" +
>             "        \"name\": \"foo\",\n" +
>             "        \"type\": {\n" +
>             "            \"name\": \"bar\",\n" +
>             "            \"type\": \"fixed\",\n" +
>             "            \"size\": 2\n" +
>             "        }\n" +
>             "    }, {\n" +
>             "        \"name\": \"baz\",\n" +
>             "        \"type\": [\"null\", \"bar\"],\n" +
>             "        \"default\": null\n" +
>             "    }]\n" +
>             "}";
>
>      public static class SampleMapper extends
> Mapper<AvroKey<GenericRecord>, NullWritable, NullWritable, NullWritable>
{
>         private AvroMultipleOutputs amos;
>
>          @Override
>         protected void setup(Context context) {
>             amos = new AvroMultipleOutputs(context);
>         }
>
>          @Override
>         protected void cleanup(Context context) throws IOException,
> InterruptedException {
>             amos.close();
>         }
>
>          @Override
>         protected void map(AvroKey<GenericRecord> record, NullWritable
> ignore, Context context)
>                 throws IOException, InterruptedException {
>     // simply write the record to a container using AvroMultipleOutputs
>             amos.write("avro", new AvroKey<GenericRecord>(record.datum()),
> NullWritable.get());
>         }
>     }
>
>      @Override
>     public int run(final String[] args) throws Exception {
>         Schema.Parser parser = new Schema.Parser();
>         Schema schema = parser.parse(SCHEMA);
>
>          //
>         // generate avro container file for input to mapper
>         byte[] dummy = {(byte) 0x01, (byte) 0x02};
>         GenericData.Fixed foo = new
> GenericData.Fixed(schema.getField("foo").schema(), dummy);
>         GenericData.Fixed baz = new
> GenericData.Fixed(schema.getField("baz").schema().getTypes().get(1), dummy);
>
>          GenericRecordBuilder builder = new GenericRecordBuilder(schema)
>                 .set(schema.getField("foo"), foo);
>         GenericRecord record0 = builder.build(); // baz is null
>
>          builder.set(schema.getField("baz"), baz);
>         GenericRecord record1 = builder.build(); // baz is not null, bad
> news
>
>          File file = new File("/tmp/avrotest/input/test.avro");
>         DatumWriter<GenericRecord> datumWriter = new
> GenericDatumWriter<GenericRecord>(schema);
>         DataFileWriter<GenericRecord> dataFileWriter = new
> DataFileWriter<GenericRecord>(datumWriter);
>         dataFileWriter.create(schema, file);
>         dataFileWriter.append(record0);
>         //
>         // HELP: job succeeds when we do not have record with non-null
> baz, comment out to succeed
>         //
>         dataFileWriter.append(record1);
>         dataFileWriter.close();
>
>          //
>         // configure and run job
>         Configuration configuration = new Configuration();
>         String[] otherArgs = new GenericOptionsParser(configuration,
> args).getRemainingArgs();
>         Job job = Job.getInstance(configuration, "Sample Avro Map Reduce");
>
>          job.setInputFormatClass(AvroKeyInputFormat.class);
>         AvroJob.setInputKeySchema(job, schema);
>
>          job.setMapperClass(SampleMapper.class);
>         job.setNumReduceTasks(0);
>
>          AvroJob.setOutputKeySchema(job, schema);
>         AvroMultipleOutputs.addNamedOutput(job, "avro",
> AvroKeyOutputFormat.class, schema);
>
>          FileInputFormat.addInputPath(job, new
> Path(("/tmp/avrotest/input")));
>         FileOutputFormat.setOutputPath(job, new
> Path("/tmp/avrotest/output"));
>
>          return (job.waitForCompletion(true) ? 0 : 1);
>     }
>
>      public static void main(String[] args) throws Exception {
>         int exitCode = ToolRunner.run(new AvroContainerFileDriver(), args);
>         System.exit(exitCode);
>     }
> }
>  </mr_job>
>
>  Thanks,
> John Pauley
> Sr. Software Engineer
> ThreatTrack Security
>
>

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