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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (PIG-1278) Type mismatch in key from map: expected org.apache.pig.impl.io.NullableFloatWritable, recieved org.apache.pig.impl.io.NullableText
Date Mon, 08 Mar 2010 23:33:27 GMT

     [ https://issues.apache.org/jira/browse/PIG-1278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Richard Ding resolved PIG-1278.
-------------------------------

      Resolution: Duplicate
    Release Note: PIG-1238

> Type mismatch in key from map: expected org.apache.pig.impl.io.NullableFloatWritable,
recieved org.apache.pig.impl.io.NullableText 
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-1278
>                 URL: https://issues.apache.org/jira/browse/PIG-1278
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.6.0
>            Reporter: Viraj Bhat
>            Assignee: Richard Ding
>             Fix For: 0.7.0
>
>
> I have a script which uses Map data, and runs a UDF, which creates random numbers and
then orders the data by these random numbers.
> {code}
> REGISTER myloader.jar;
> --jar produced from the source code listed below
> REGISTER math.jar;
> DEFINE generator math.Random();
> inputdata = LOAD '/user/viraj/mymapdata'   USING MyMapLoader()    AS (s:map[], m:map[],
l:map[]);
> queries = FILTER inputdata   BY m#'key'#'query' IS NOT null;
> queries_rand = FOREACH queries  GENERATE generator('') AS rand_num, (CHARARRAY) m#'key'#'query'
AS query_string;
> queries_sorted = ORDER queries_rand  BY rand_num  PARALLEL 10;
> queries_limit = LIMIT queries_sorted 1000;
> rand_queries = FOREACH queries_limit  GENERATE query_string;
> STORE rand_queries INTO 'finalresult';
> {code}
> UDF source for Random.java
> {code}
> package math;
> import java.io.IOException;
> /*
> * Implements a random float [0,1) generator.
> */
> public class Random extends EvalFunc<Float>
> {
>         private final Random m_rand = new Random();
>        public Float exec(Tuple input) throws IOException
>         {
>                return new Float(m_rand.nextFloat());
>         }
>         public Schema outputSchema(Schema input)
>         {
>                final String name = getSchemaName(getClass().getName(), input);
>                return new Schema(new Schema.FieldSchema(name, DataType.FLOAT));
>         }
> }
> {code}
> Running this script returns the following error in the Mapper
> =============================================
> java.io.IOException: Type mismatch in key from map: expected org.apache.pig.impl.io.NullableFloatWritable,
recieved org.apache.pig.impl.io.NullableText at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:845)
at org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:466) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.collect(PigMapReduce.java:109)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:255)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:244)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.map(PigMapReduce.java:94)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:159)

> =============================================

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