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From "Vyacheslav Zholudev (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AVRO-969) Make possible usage of SpecificDatumWriter in avro-mapred
Date Fri, 02 Dec 2011 11:55:39 GMT
Make possible usage of SpecificDatumWriter in avro-mapred
---------------------------------------------------------

                 Key: AVRO-969
                 URL: https://issues.apache.org/jira/browse/AVRO-969
             Project: Avro
          Issue Type: Improvement
          Components: java
    Affects Versions: 1.6.1
            Reporter: Vyacheslav Zholudev


I realized that ReflectDatumWriter is always used when running mapred job (in AvroOutputFormat.java).
Sometimes it leads to bugs like in AVRO-966.
Why not just provide a property like {{WRITER_IS_REFLECT = "avro.map.writer.is.reflect";}}
to make a decision which DatumWriter should be used. 
I created a small patch to solve this:

{code:title=avro-mapred.patch|borderStyle=solid}
Index: lang/java/mapred/src/main/java/org/apache/avro/mapred/AvroJob.java
===================================================================
--- lang/java/mapred/src/main/java/org/apache/avro/mapred/AvroJob.java  (revision 1209417)
+++ lang/java/mapred/src/main/java/org/apache/avro/mapred/AvroJob.java  (revision )
@@ -53,6 +53,8 @@
   /** The configuration key for reflection-based map output representation. */
   public static final String MAP_OUTPUT_IS_REFLECT = "avro.map.output.is.reflect";
 
+  public static final String WRITER_IS_REFLECT = "avro.map.writer.is.reflect";
+
   /** Configure a job's map input schema. */
   public static void setInputSchema(JobConf job, Schema s) {
     job.set(INPUT_SCHEMA, s.toString());
Index: lang/java/mapred/src/main/java/org/apache/avro/mapred/AvroOutputFormat.java
===================================================================
--- lang/java/mapred/src/main/java/org/apache/avro/mapred/AvroOutputFormat.java (revision
1209417)
+++ lang/java/mapred/src/main/java/org/apache/avro/mapred/AvroOutputFormat.java (revision
)
@@ -23,6 +23,7 @@
 import java.util.Map;
 import java.net.URLDecoder;
 
+import org.apache.avro.specific.SpecificDatumWriter;
 import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
@@ -102,8 +103,9 @@
       ? AvroJob.getMapOutputSchema(job)
       : AvroJob.getOutputSchema(job);
 
-    final DataFileWriter<T> writer =
-      new DataFileWriter<T>(new ReflectDatumWriter<T>());
+    final DataFileWriter<T> writer = job.getBoolean(AvroJob.WRITER_IS_REFLECT, false)
?
+      new DataFileWriter<T>(new ReflectDatumWriter<T>()) :
+      new DataFileWriter<T>(new SpecificDatumWriter<T>());
     
     configureDataFileWriter(writer, job);
{code}

Does it make sense? 

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