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  1. Pig
  2. PIG-2411

AvroStorage UDF in PiggyBank fails to STORE a bag of single-field tuples as Avro arrays

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.9.0, 0.9.1, 0.9.2
    • Fix Version/s: 0.10.0
    • Component/s: piggybank
    • Labels:
    • Environment:

      Mac OS X 10.6.8 in local mode

    • Patch Info:
      Patch Available
    • Hadoop Flags:
      Reviewed
    • Tags:
      avro udf piggybank pig storage

      Description

      This patch is a fix for a bug for persisting bags of tuples via AvroStorage.

      The script that alerted me to a bug is:

      messages = LOAD '/tmp/messages.avro' USING AvroStorage();
      user_groups = GROUP messages by user_id;
      per_user = FOREACH user_groups

      { sorted = ORDER messages BY message_id DESC; GENERATE group AS user_id, sorted AS messages; }

      DESCRIBE per_user
      > per_user: {user_id: int,messages: {(message_id: int,topic: chararray,user_id: int)}}
      STORE per_user INTO '/tmp/per_user.avro' USING AvroStorage();

      The error is:

      Pig Stack Trace
      ---------------
      ERROR 1002: Unable to store alias per_user

      org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1002: Unable to store alias per_user
      at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1596)
      at org.apache.pig.PigServer.registerQuery(PigServer.java:584)
      at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:942)
      at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
      at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:188)
      at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164)
      at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:67)
      at org.apache.pig.Main.run(Main.java:487)
      at org.apache.pig.Main.main(Main.java:108)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
      Caused by: java.lang.NullPointerException
      at org.apache.pig.piggybank.storage.avro.AvroStorageUtils.isTupleWrapper(AvroStorageUtils.java:327)
      at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convert(PigSchema2Avro.java:82)
      at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convert(PigSchema2Avro.java:105)
      at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convertRecord(PigSchema2Avro.java:151)
      at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convert(PigSchema2Avro.java:62)
      at org.apache.pig.piggybank.storage.avro.AvroStorage.checkSchema(AvroStorage.java:502)
      at org.apache.pig.newplan.logical.rules.InputOutputFileValidator$InputOutputFileVisitor.visit(InputOutputFileValidator.java:65)
      at org.apache.pig.newplan.logical.relational.LOStore.accept(LOStore.java:77)
      at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:64)
      at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)
      at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)
      at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)
      at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)
      at org.apache.pig.newplan.DepthFirstWalker.walk(DepthFirstWalker.java:53)
      at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
      at org.apache.pig.newplan.logical.rules.InputOutputFileValidator.validate(InputOutputFileValidator.java:45)
      at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:292)
      at org.apache.pig.PigServer.compilePp(PigServer.java:1360)
      at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1297)
      at org.apache.pig.PigServer.execute(PigServer.java:1286)
      at org.apache.pig.PigServer.access$400(PigServer.java:125)
      at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1591)
      ... 13 more

        Attachments

        1. messages.avro
          0.3 kB
          Daniel Dai
        2. PIG-2411-1.patch
          3 kB
          Daniel Dai
        3. avrobug.patch
          1 kB
          Russell Jurney

          Activity

            People

            • Assignee:
              russell.jurney Russell Jurney
              Reporter:
              russell.jurney Russell Jurney
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              Watchers:
              2 Start watching this issue

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              • Created:
                Updated:
                Resolved:

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