Author: cutting
Date: Fri Mar 30 10:11:24 2007
New Revision: 524181
URL: http://svn.apache.org/viewvc?view=rev&rev=524181
Log:
HADOOP-1166. Add a NullOutputFormat and use it in the RandomWriter example.
Contributed by Owen.
Added:
lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/lib/NullOutputFormat.java
Modified:
lucene/hadoop/trunk/CHANGES.txt
lucene/hadoop/trunk/src/examples/org/apache/hadoop/examples/RandomWriter.java
Modified: lucene/hadoop/trunk/CHANGES.txt
URL:
http://svn.apache.org/viewvc/lucene/hadoop/trunk/CHANGES.txt?view=diff&rev=524181&r1=524180&r2=524181
==============================================================================
--- lucene/hadoop/trunk/CHANGES.txt (original)
+++ lucene/hadoop/trunk/CHANGES.txt Fri Mar 30 10:11:24 2007
@@ -58,6 +58,9 @@
17. HADOOP-1164. Fix TestReplicationPolicy to specify port zero, so
that a free port is automatically selected. (omalley via cutting)
+18. HADOOP-1166. Add a NullOutputFormat and use it in the
+ RandomWriter example. (omalley via cutting)
+
Release 0.12.3 (not yet released)
Modified:
lucene/hadoop/trunk/src/examples/org/apache/hadoop/examples/RandomWriter.java
URL:
http://svn.apache.org/viewvc/lucene/hadoop/trunk/src/examples/org/apache/hadoop/examples/RandomWriter.java?view=diff&rev=524181&r1=524180&r2=524181
==============================================================================
---
lucene/hadoop/trunk/src/examples/org/apache/hadoop/examples/RandomWriter.java
(original)
+++
lucene/hadoop/trunk/src/examples/org/apache/hadoop/examples/RandomWriter.java
Fri Mar 30 10:11:24 2007
@@ -28,7 +28,7 @@
import org.apache.hadoop.io.SequenceFile.CompressionType;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.mapred.lib.IdentityReducer;
-import org.apache.hadoop.util.Progressable;
+import org.apache.hadoop.mapred.lib.NullOutputFormat;
/**
* This program uses map/reduce to just run a distributed job where there is
@@ -107,20 +107,6 @@
}
}
- /**
- * Consume all outputs and put them in /dev/null.
- */
- static class DataSink implements OutputFormat {
- public RecordWriter getRecordWriter(FileSystem ignored, JobConf job,
- String name, Progressable progress) {
- return new RecordWriter(){
- public void write(WritableComparable key, Writable value) { }
- public void close(Reporter reporter) { }
- };
- }
- public void checkOutputSpecs(FileSystem ignored, JobConf job) { }
- }
-
static class Map extends MapReduceBase implements Mapper {
private FileSystem fileSys = null;
private JobConf jobConf = null;
@@ -202,14 +188,6 @@
* It runs 10 maps/node and each node writes 1 gig of data to a DFS file.
* The reduce doesn't do anything.
*
- * This program uses a useful pattern for dealing with Hadoop's constraints
- * on InputSplits. Since each input split can only consist of a file and
- * byte range and we want to control how many maps there are (and we don't
- * really have any inputs), we create a directory with a set of artificial
- * files that each contain the filename that we want a given map to write
- * to. Then, using the text line reader and this "fake" input directory, we
- * generate exactly the right number of maps. Each map gets a single record
- * that is the filename it is supposed to write its output to.
* @throws IOException
*/
public static void main(String[] args) throws IOException {
@@ -237,7 +215,7 @@
job.setInputFormat(RandomInputFormat.class);
job.setMapperClass(Map.class);
job.setReducerClass(IdentityReducer.class);
- job.setOutputFormat(DataSink.class);
+ job.setOutputFormat(NullOutputFormat.class);
JobClient client = new JobClient(job);
ClusterStatus cluster = client.getClusterStatus();
Added:
lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/lib/NullOutputFormat.java
URL:
http://svn.apache.org/viewvc/lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/lib/NullOutputFormat.java?view=auto&rev=524181
==============================================================================
---
lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/lib/NullOutputFormat.java
(added)
+++
lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/lib/NullOutputFormat.java
Fri Mar 30 10:11:24 2007
@@ -0,0 +1,43 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.mapred.lib;
+
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.io.Writable;
+import org.apache.hadoop.io.WritableComparable;
+import org.apache.hadoop.mapred.JobConf;
+import org.apache.hadoop.mapred.OutputFormat;
+import org.apache.hadoop.mapred.RecordWriter;
+import org.apache.hadoop.mapred.Reporter;
+import org.apache.hadoop.util.Progressable;
+
+/**
+ * Consume all outputs and put them in /dev/null.
+ */
+public class NullOutputFormat implements OutputFormat {
+ public RecordWriter getRecordWriter(FileSystem ignored, JobConf job,
+ String name, Progressable progress) {
+ return new RecordWriter(){
+ public void write(WritableComparable key, Writable value) { }
+ public void close(Reporter reporter) { }
+ };
+ }
+
+ public void checkOutputSpecs(FileSystem ignored, JobConf job) { }
+}
