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Avro, mail # dev - [jira] [Created] (AVRO-1452) Problem when using AvroMultipleOutputs with multiple schemas

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[jira] [Created] (AVRO-1452) Problem when using AvroMultipleOutputs with multiple schemas
"Vladislav Spivak 2014-02-03, 18:52
Vladislav Spivak created AVRO-1452:

             Summary: Problem when using AvroMultipleOutputs with multiple schemas
                 Key: AVRO-1452
                 URL: https://issues.apache.org/jira/browse/AVRO-1452
             Project: Avro
          Issue Type: Bug
    Affects Versions: 1.7.6
         Environment: Any Platform
            Reporter: Vladislav Spivak
When using multiple named outputs with different Key/Value Schemas, the last provided schema overrides any previous schema definitions after first write attempt. This happens due to issue with the following  code in AvroMultipleOutputs.java:509
    Job job = new Job(context.getConfiguration());
    setSchema(job, keySchema, valSchema);
    taskContext = createTaskAttemptContext(
      job.getConfiguration(), context.getTaskAttemptID());
Every time this code runs, actual configuration instance passed to createTaskAttemptContext remains the same, because Job constructor creates new configuration copy only if it is not instanceof JobConf. This way we have properties  "avro.schema.output.XXX" overwrote each time new TaskAttemptContext is initialised and also mistakenly shared Configuration instance for all TaskAttemptContextes

Proposed fix:
a) use "Job getInstance(Configuration conf)" or
b) call "new Job(new Configuration(context.getConfiguration))"

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