MAPREDUCE-3458. Fix findbugs warnings in hadoop-examples. (Devaraj K via mahadev)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1210190 13f79535-47bb-0310-9956-ffa450edef68
2011-12-04 19:58:32 +00:00 · 2011-12-04 19:58:32 +00:00 · 1972a76e5a
commit 1972a76e5a
parent bb2b8f565c
8 changed files with 128 additions and 12 deletions
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@ -233,6 +233,9 @@ Release 0.23.1 - Unreleased
    MAPREDUCE-3456. $HADOOP_PREFIX/bin/yarn should set defaults for 
    $HADOOP_*_HOME (Eric Payne via mahadev)

+    MAPREDUCE-3458. Fix findbugs warnings in hadoop-examples. (Devaraj K
+    via mahadev)
+
 Release 0.23.0 - 2011-11-01 

  INCOMPATIBLE CHANGES
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/dev-support/findbugs-exclude.xml
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/dev-support/findbugs-exclude.xml
@ -0,0 +1,63 @@
+<!--
+   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.
+-->
+
+<FindBugsFilter>
+
+ <!-- Ignore some irrelevant serialization warnings -->
+  <Match>
+    <Class name="org.apache.hadoop.examples.SecondarySort$FirstGroupingComparator" />
+    <Bug pattern="SE_COMPARATOR_SHOULD_BE_SERIALIZABLE" />
+  </Match>
+
+  <Match>
+    <Class name="org.apache.hadoop.examples.SecondarySort$IntPair$Comparator" />
+    <Bug pattern="SE_COMPARATOR_SHOULD_BE_SERIALIZABLE" />
+  </Match>
+
+
+ <!-- Ignore the irrelevant resource cleanup warnings-->
+  <Match>
+    <Class name="org.apache.hadoop.examples.DBCountPageView" />
+    <Method name="verify" />
+    <Bug pattern="OBL_UNSATISFIED_OBLIGATION" />
+  </Match>
+
+ <!-- Ignore the irrelevant closure warnings-->
+  <Match>
+    <Class name="org.apache.hadoop.examples.dancing.Pentomino$Piece" />
+    <Bug pattern="EI_EXPOSE_REP2" />
+  </Match>
+
+  <!-- Ignore the irrelevant package protection warnings-->
+  <Match>
+    <Class name="org.apache.hadoop.examples.dancing.Pentomino" />
+     <Or>
+      <Field name="fourRotations" />
+      <Field name="oneRotation" />
+      <Field name="twoRotations" />
+     </Or>
+    <Bug pattern="MS_PKGPROTECT" />
+  </Match>
+
+   <!-- Ignore the irrelevant right shift warnings, as only positive integers are given as input-->
+  <Match>
+    <Class name="org.apache.hadoop.examples.terasort.Unsigned16" />
+    <Method name="getHexDigit" />
+    <Bug pattern="ICAST_QUESTIONABLE_UNSIGNED_RIGHT_SHIFT" />
+  </Match>
+
+</FindBugsFilter>
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/pom.xml
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/pom.xml
@ -27,6 +27,10 @@
  <name>Apache Hadoop MapReduce Examples</name>
  <packaging>jar</packaging>

+  <properties>
+    <mr.examples.basedir>${basedir}</mr.examples.basedir>
+  </properties>
+
  <dependencies>
    <dependency>
      <groupId>org.apache.hadoop</groupId>
@ -58,6 +62,18 @@
       </archive>
     </configuration>
    </plugin>
+
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>findbugs-maven-plugin</artifactId>
+         <configuration>
+          <findbugsXmlOutput>true</findbugsXmlOutput>
+          <xmlOutput>true</xmlOutput>
+          <excludeFilterFile>${mr.examples.basedir}/dev-support/findbugs-exclude.xml</excludeFilterFile>
+          <effort>Max</effort>
+        </configuration>
+      </plugin>
+
   </plugins>
   </build>
 </project>
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/Join.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/Join.java
@ -19,7 +19,9 @@
 package org.apache.hadoop.examples;

 import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;

 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
@ -29,9 +31,14 @@
 import org.apache.hadoop.io.WritableComparable;
 import org.apache.hadoop.mapred.ClusterStatus;
 import org.apache.hadoop.mapred.JobClient;
-import org.apache.hadoop.mapreduce.*;
+import org.apache.hadoop.mapreduce.InputFormat;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.Mapper;
+import org.apache.hadoop.mapreduce.OutputFormat;
+import org.apache.hadoop.mapreduce.Reducer;
 import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
-import org.apache.hadoop.mapreduce.lib.join.*;
+import org.apache.hadoop.mapreduce.lib.join.CompositeInputFormat;
+import org.apache.hadoop.mapreduce.lib.join.TupleWritable;
 import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
 import org.apache.hadoop.util.Tool;
@ -52,7 +59,7 @@
 *            [<i>in-dir</i>]* <i>in-dir</i> <i>out-dir</i> 
 */
 public class Join extends Configured implements Tool {
-  public static String REDUCES_PER_HOST = "mapreduce.join.reduces_per_host";
+  public static final String REDUCES_PER_HOST = "mapreduce.join.reduces_per_host";
  static int printUsage() {
    System.out.println("join [-r <reduces>] " +
                       "[-inFormat <input format class>] " +
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/dancing/Pentomino.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/dancing/Pentomino.java
@ -69,7 +69,7 @@ public String getName() {
    }
    
    public int[] getRotations() {
-      return rotations;
+      return rotations.clone();
    }
    
    public boolean getFlippable() {
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraGen.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraGen.java
@ -70,7 +70,7 @@ public class TeraGen extends Configured implements Tool {

  public static enum Counters {CHECKSUM}

-  public static String NUM_ROWS = "mapreduce.terasort.num-rows";
+  public static final String NUM_ROWS = "mapreduce.terasort.num-rows";
  /**
   * An input format that assigns ranges of longs to each mapper.
   */
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraInputFormat.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraInputFormat.java
@ -156,10 +156,10 @@ Text[] createPartitions(int numPartitions) {
   * them and picks N-1 keys to generate N equally sized partitions.
   * @param job the job to sample
   * @param partFile where to write the output file to
-   * @throws IOException if something goes wrong
+   * @throws Throwable if something goes wrong
   */
  public static void writePartitionFile(final JobContext job, 
-      Path partFile) throws IOException, InterruptedException  {
+      Path partFile) throws Throwable  {
    long t1 = System.currentTimeMillis();
    Configuration conf = job.getConfiguration();
    final TeraInputFormat inFormat = new TeraInputFormat();
@ -174,11 +174,12 @@ public static void writePartitionFile(final JobContext job,
    final long recordsPerSample = sampleSize / samples;
    final int sampleStep = splits.size() / samples;
    Thread[] samplerReader = new Thread[samples];
+    SamplerThreadGroup threadGroup = new SamplerThreadGroup("Sampler Reader Thread Group");
    // take N samples from different parts of the input
    for(int i=0; i < samples; ++i) {
      final int idx = i;
      samplerReader[i] = 
-        new Thread ("Sampler Reader " + idx) {
+        new Thread (threadGroup,"Sampler Reader " + idx) {
        {
          setDaemon(true);
        }
@ -201,7 +202,7 @@ public void run() {
          } catch (IOException ie){
            System.err.println("Got an exception while reading splits " +
                StringUtils.stringifyException(ie));
-            System.exit(-1);
+            throw new RuntimeException(ie);
          } catch (InterruptedException e) {
        	  
          }
@ -215,6 +216,9 @@ public void run() {
    for (int i = 0; i < samples; i++) {
      try {
        samplerReader[i].join();
+        if(threadGroup.getThrowable() != null){
+          throw threadGroup.getThrowable();
+        }
      } catch (InterruptedException e) {
      }
    }
@ -226,6 +230,25 @@ public void run() {
    System.out.println("Computing parititions took " + (t3 - t2) + "ms");
  }
  
+  static class SamplerThreadGroup extends ThreadGroup{
+
+    private Throwable throwable;
+
+    public SamplerThreadGroup(String s) {
+      super(s);
+    }
+    
+    @Override
+    public void uncaughtException(Thread thread, Throwable throwable) {
+      this.throwable = throwable;
+    }
+    
+    public Throwable getThrowable() {
+      return this.throwable;
+    }
+    
+  }
+
  static class TeraRecordReader extends RecordReader<Text,Text> {
    private FSDataInputStream in;
    private long offset;
--- a/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraSort.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraSort.java
@ -31,7 +31,6 @@
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.Text;
-import org.apache.hadoop.mapreduce.Cluster;
 import org.apache.hadoop.mapreduce.Job;
 import org.apache.hadoop.mapreduce.JobContext;
 import org.apache.hadoop.mapreduce.MRJobConfig;
@ -300,7 +299,12 @@ public int run(String[] args) throws Exception {
                                    TeraInputFormat.PARTITION_FILENAME);
      URI partitionUri = new URI(partitionFile.toString() +
                                 "#" + TeraInputFormat.PARTITION_FILENAME);
-      TeraInputFormat.writePartitionFile(job, partitionFile);
+      try {
+        TeraInputFormat.writePartitionFile(job, partitionFile);
+      } catch (Throwable e) {
+        LOG.error(e.getMessage());
+        return -1;
+      }
      job.addCacheFile(partitionUri);
      job.createSymlink();    
      long end = System.currentTimeMillis();