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From David Ortiz <dpo5...@gmail.com>
Subject Re: Error while trying to obtain the top elements.
Date Tue, 07 Jul 2015 13:26:47 GMT
That looks weird.  Can you try it using Avros in place of Writables and see
if it does the same thing?

On Tue, Jul 7, 2015, 3:43 AM Florin Tatu <tatuflorin@gmail.com> wrote:

> Hi,
>
> I am having a job that processes a set of files containing climatic
> data(more exactly data from this location:
> ftp://ftp.ncdc.noaa.gov/pub/data/noaa/)
>
> I downloaded and merged the data using a script so I will have one folder
> (ncdc_data) having a .gz archive for each year(eg: 1901.gz, 1902.gz etc)
> Each archive contains only one text file.
>
> My code is:
>
> import com.google.common.base.Charsets;
> import com.google.common.io.Files;
> import org.apache.crunch.*;
> import org.apache.crunch.fn.Aggregators;
> import org.apache.crunch.impl.mr.MRPipeline;
> import org.apache.crunch.io.To;
> import java.io.File;
> import static org.apache.crunch.types.writable.Writables.ints;
> import static org.apache.crunch.types.writable.Writables.strings;
> import static org.apache.crunch.types.writable.Writables.tableOf;
>
> public class MaxTemperatureCrunch {
>
>     public static void main(String[] args) throws Exception {
>         if (args.length != 2) {
>             System.err.println("Usage: MaxTemperatureCrunch <input path>
> <output path>");
>             System.exit(-1);
>         }
>
>         Pipeline pipeline = new MRPipeline(MaxTemperatureCrunch.class);
>
>         PCollection<String> records = pipeline.readTextFile(args[0]);
>
>         PTable<String, Integer> yearTemperatures = records
>                 .parallelDo(toYearTempPairsFn(), tableOf(strings(),
> ints()));
>
>         PTable<String, Integer> maxTemps = yearTemperatures
>                 .groupByKey()
>                 .combineValues(Aggregators.MAX_INTS())
>                 .top(1);   //LINE THAT CAUSES THE ERROR
>
>         maxTemps.write(To.textFile(args[1]));
>
>         PipelineResult result = pipeline.done();
>         String dot =
> pipeline.getConfiguration().get("crunch.planner.dotfile");
>         Files.write(dot, new File("pipeline.dot"), Charsets.UTF_8);
>         Runtime.getRuntime().exec("dot -Tpng -O pipeline.dot");
>         System.exit(result.succeeded() ? 0 : 1);
>     }
>
>     static DoFn<String, Pair<String, Integer>> toYearTempPairsFn() {
>         return new DoFn<String, Pair<String, Integer>>() {
>             NcdcRecordParser parser = new NcdcRecordParser();
>             @Override
>             public void process(String input, Emitter<Pair<String,
> Integer>> emitter) {
>                 parser.parse(input);
>                 if (parser.isValidTemperature()) {
>                     emitter.emit(Pair.of(parser.getYear(),
> parser.getAirTemperature()));
>                 }
>             }
>         };
>     }
> }
>
>
> Hadoop runs locally in standalone mode.
> Hadoop version is: 2.7.0
> Crunch version is: 0.12.0  (maven dependency: 0.12.0-hadoop2)
>
> I build my application with: mvn package
> I run it with: hadoop jar target/crunch-demo-1.0-SNAPSHOT-job.jar
> ncdc_data/ output
>
> If I do not call .top(1) (see comment:  //LINE THAT CAUSES THE ERROR)
> everything works fine, but I obtain the maximum temperatures for each year
> only and I want to obtain the overall maximum temperature or the top N
> temperatures for the whole data set.
>
> If I call .top(1) I obtain the following error:
>
> java.lang.Exception: org.apache.crunch.CrunchRuntimeException: Error
> reloading writable comparable codes
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
> at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522)
> Caused by: org.apache.crunch.CrunchRuntimeException: Error reloading
> writable comparable codes
> at
> org.apache.crunch.types.writable.TupleWritable.setConf(TupleWritable.java:71)
> at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:76)
> at
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:136)
> at
> org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:66)
> at
> org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:42)
> at
> org.apache.hadoop.io.SequenceFile$Reader.deserializeValue(SequenceFile.java:2247)
> at
> org.apache.hadoop.io.SequenceFile$Reader.getCurrentValue(SequenceFile.java:2220)
> at
> org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader.nextKeyValue(SequenceFileRecordReader.java:78)
> at
> org.apache.crunch.impl.mr.run.CrunchRecordReader.nextKeyValue(CrunchRecordReader.java:157)
> at
> org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556)
> at
> org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
> at
> org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.crunch.types.writable.TupleWritable
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:274)
> at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:625)
> at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
> at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
> at java.io.ObjectInputStream.readClass(ObjectInputStream.java:1483)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
> at
> com.google.common.collect.Serialization.populateMap(Serialization.java:91)
> at com.google.common.collect.HashBiMap.readObject(HashBiMap.java:109)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
> at
> org.apache.crunch.types.writable.Writables.reloadWritableComparableCodes(Writables.java:145)
> at
> org.apache.crunch.types.writable.TupleWritable.setConf(TupleWritable.java:69)
> ... 20 more
>
>
> Did anyone encountered this issue?
> If you need any other details please ask me.
>
> Thank you,
> Florin
>

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