MAPREDUCE-6947. Moving logging APIs over to slf4j in hadoop-mapreduce-examples. Contributed by Gergely Novák.

(cherry picked from commit 53be075241f1ba92bfe47e89c2dfc3f0664e2578)

Conflicts:
	hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraOutputFormat.java

hadoop-mapreduce-project/hadoop-mapreduce-examples/pom.xml

@@ -114,6 +114,10 @@
       <artifactId>guava</artifactId>
       <scope>provided</scope>
      </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+    </dependency>
   </dependencies>
   
   <build>

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/BaileyBorweinPlouffe.java

@@ -29,8 +29,6 @@ import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.fs.FileSystem;
@@ -52,6 +50,8 @@ import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 import org.apache.hadoop.util.Time;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import com.google.common.base.Charsets;
 
@@ -84,7 +84,8 @@ public class BaileyBorweinPlouffe extends Configured implements Tool {
   private static final String DIGIT_SIZE_PROPERTY = NAME + ".digit.size";
   private static final String DIGIT_PARTS_PROPERTY = NAME + ".digit.parts";
 
-  private static final Log LOG = LogFactory.getLog(BaileyBorweinPlouffe.class);
+  private static final Logger LOG =
+      LoggerFactory.getLogger(BaileyBorweinPlouffe.class);
 
   /** Mapper class computing digits of Pi. */
   public static class BbpMapper extends

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/DBCountPageView.java

@@ -30,8 +30,6 @@ import java.sql.Statement;
 import java.util.Iterator;
 import java.util.Random;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.io.LongWritable;
@@ -50,6 +48,8 @@ import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
 import org.hsqldb.server.Server;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * This is a demonstrative program, which uses DBInputFormat for reading
@@ -78,7 +78,8 @@ import org.hsqldb.server.Server;
  */
 public class DBCountPageView extends Configured implements Tool {
 
-  private static final Log LOG = LogFactory.getLog(DBCountPageView.class);
+  private static final Logger LOG =
+      LoggerFactory.getLogger(DBCountPageView.class);
   
   private Connection connection;
   private boolean initialized = false;

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/dancing/DancingLinks.java

@@ -19,8 +19,8 @@ package org.apache.hadoop.examples.dancing;
 
 import java.util.*;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * A generic solver for tile laying problems using Knuth's dancing link
@@ -35,8 +35,7 @@ import org.apache.commons.logging.LogFactory;
  * The type parameter ColumnName is the class of application's column names.
  */
 public class DancingLinks<ColumnName> {
-  private static final Log LOG = 
-    LogFactory.getLog(DancingLinks.class.getName());
+  private static final Logger LOG = LoggerFactory.getLogger(DancingLinks.class);
   
   /**
    * A cell in the table with up/down and left/right links that form doubly

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/pi/DistSum.java

@@ -28,8 +28,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Callable;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.examples.pi.math.Summation;
@@ -55,6 +53,8 @@ import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * The main class for computing sums using map/reduce jobs.
@@ -66,7 +66,7 @@ import org.apache.hadoop.util.ToolRunner;
  * a mix-type job may be executed on either side.
  */
 public final class DistSum extends Configured implements Tool {
-  private static final Log LOG = LogFactory.getLog(DistSum.class);
+  private static final Logger LOG = LoggerFactory.getLogger(DistSum.class);
 
   private static final String NAME = DistSum.class.getSimpleName();
   private static final String N_PARTS = "mapreduce.pi." + NAME + ".nParts";

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraGen.java

@@ -25,8 +25,6 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.zip.Checksum;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.fs.Path;
@@ -49,6 +47,8 @@ import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 import org.apache.hadoop.util.PureJavaCrc32;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Generate the official GraySort input data set.
@@ -66,7 +66,7 @@ import org.apache.hadoop.util.ToolRunner;
  * <b>bin/hadoop jar hadoop-*-examples.jar teragen 10000000000 in-dir</b>
  */
 public class TeraGen extends Configured implements Tool {
-  private static final Log LOG = LogFactory.getLog(TeraGen.class);
+  private static final Logger LOG = LoggerFactory.getLogger(TeraGen.class);
 
   public static enum Counters {CHECKSUM}
 

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraScheduler.java

@@ -21,17 +21,18 @@ package org.apache.hadoop.examples.terasort;
 import java.io.*;
 import java.util.*;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.lib.input.FileSplit;
 import org.apache.hadoop.mapreduce.server.tasktracker.TTConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import com.google.common.base.Charsets;
 
 class TeraScheduler {
-  private static final Log LOG = LogFactory.getLog(TeraScheduler.class);
+  private static final Logger LOG =
+      LoggerFactory.getLogger(TeraScheduler.class);
   private Split[] splits;
   private List<Host> hosts = new ArrayList<Host>();
   private int slotsPerHost;

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraSort.java

@@ -23,8 +23,6 @@ import java.io.IOException;
 import java.io.PrintStream;
 import java.net.URI;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configurable;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
@@ -38,6 +36,8 @@ import org.apache.hadoop.mapreduce.Partitioner;
 import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Generates the sampled split points, launches the job, and waits for it to
@@ -47,7 +47,7 @@ import org.apache.hadoop.util.ToolRunner;
  * <b>bin/hadoop jar hadoop-*-examples.jar terasort in-dir out-dir</b>
  */
 public class TeraSort extends Configured implements Tool {
-  private static final Log LOG = LogFactory.getLog(TeraSort.class);
+  private static final Logger LOG = LoggerFactory.getLogger(TeraSort.class);
 
   /**
    * A partitioner that splits text keys into roughly equal partitions

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/test/java/org/apache/hadoop/examples/terasort/TestTeraSort.java

@@ -20,8 +20,6 @@ package org.apache.hadoop.examples.terasort;
 import java.io.File;
 import java.io.IOException;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.mapred.FileAlreadyExistsException;
@@ -29,12 +27,14 @@ import org.apache.hadoop.mapred.HadoopTestCase;
 import org.apache.hadoop.util.ToolRunner;
 import org.junit.After;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
 public class TestTeraSort extends HadoopTestCase {
-  private static Log LOG = LogFactory.getLog(TestTeraSort.class);
+  private static final Logger LOG = LoggerFactory.getLogger(TestTeraSort.class);
   
   public TestTeraSort()
       throws IOException {