[GORA-388] MongoStore: Fix handling of Utf8 in filters

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.5
• Fix Version/s: 0.6
• Component/s: gora-mongodb
• Assignee: Unassigned
• Reporter: Damien Raude-Morvan
• Created: 19/Oct/14 17:07
• Updated: 14/Jan/15 23:11
• Resolved: 14/Jan/15 22:59

Description

Gora 0.5 MongoDB driver fail to properly serialize Utf8 instance passed to its local filters implementation.

Here is sample code

filter.getOperands().add(new Utf8(batchId));

that will trigger the following exception at runtime

java.lang.IllegalArgumentException: can't serialize class
org.apache.avro.util.Utf8
at org.bson.BasicBSONEncoder._putObjectField(BasicBSONEncoder.java:284)
at org.bson.BasicBSONEncoder.putObject(BasicBSONEncoder.java:185)
at org.bson.BasicBSONEncoder.putObject(BasicBSONEncoder.java:131)
at com.mongodb.DefaultDBEncoder.writeObject(DefaultDBEncoder.java:33)
at com.mongodb.OutMessage.putObject(OutMessage.java:289)
at com.mongodb.OutMessage.writeQuery(OutMessage.java:211)
at com.mongodb.OutMessage.query(OutMessage.java:86)
at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:81)
at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:66)
at com.mongodb.DBCursor._check(DBCursor.java:458)
at com.mongodb.DBCursor._hasNext(DBCursor.java:546)
at com.mongodb.DBCursor.hasNext(DBCursor.java:571)
at
org.apache.gora.mongodb.query.MongoDBResult.nextInner(MongoDBResult.java:69)
at org.apache.gora.query.impl.ResultBase.next(ResultBase.java:114)
at
org.apache.gora.mapreduce.GoraRecordReader.nextKeyValue(GoraRecordReader.java:119)
at
org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:531)
at org.apache.hadoop.mapreduce.MapContext.nextKeyValue(MapContext.java:67)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:223)
at java.util.concurrent.Executors$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:744)

This pattern is extensively used by Apache Nutch :

• FetcherJob
• ParserJob
• DbUpdaterJob

Issue Links

• blocks: NUTCH-1843 Upgrade to Gora 0.5