[ https://issues.apache.org/jira/browse/PIG-1748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Russell Jurney updated PIG-1748: -------------------------------- Attachment: AvroStorageUtils-bagfix.patch 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 > Add load/store function AvroStorage for avro data > ------------------------------------------------- > > Key: PIG-1748 > URL: https://issues.apache.org/jira/browse/PIG-1748 > Project: Pig > Issue Type: Improvement > Components: impl > Reporter: lin guo > Assignee: lin guo > Fix For: 0.9.0 > > Attachments: AvroStorageUtils-bagfix.patch, PIG-1748-2.patch, > PIG-1748-3.patch, avro_storage.patch, avro_test_files.tar.gz > > > We want to use Pig to process arbitrary Avro data and store results as Avro > files. AvroStorage() extends two PigFuncs: LoadFunc and StoreFunc. > Due to discrepancies of Avro and Pig data models, AvroStorage has: > 1. Limited support for "record": we do not support recursively defined record > because the number of fields in such records is data dependent. > 2. Limited support for "union": we only accept nullable union like ["null", > "some-type"]. > For simplicity, we also make the following assumptions: > If the input directory is a leaf directory, then we assume Avro data files in > it have the same schema; > If the input directory contains sub-directories, then we assume Avro data > files in all sub-directories have the same schema. > AvroStorage takes no input parameters when used as a LoadFunc (except for > "debug [debug-level]"). > Users can provide parameters to AvroStorage when used as a StoreFunc. If they > don't, Avro schema of output data is derived from its > Pig schema. > Detailed documentation can be found in > http://linkedin.jira.com/wiki/display/HTOOLS/AvroStorage+-+Pig+support+for+Avro+data -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira