HADOOP-14849. some wrong spelling words update. Contributed by Chen Hongfei.

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Task.java

@@ -887,7 +887,7 @@ abstract public class Task implements Writable, Configurable {
     }
     public void stopCommunicationThread() throws InterruptedException {
       if (pingThread != null) {
-        // Intent of the lock is to not send an interupt in the middle of an
+        // Intent of the lock is to not send an interrupt in the middle of an
         // umbilical.ping or umbilical.statusUpdate
         synchronized(lock) {
         //Interrupt if sleeping. Otherwise wait for the RPC call to return.

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/lib/MultipleOutputs.java

@@ -27,7 +27,7 @@ import java.io.IOException;
 import java.util.*;
 
 /**
- * The MultipleOutputs class simplifies writting to additional outputs other
+ * The MultipleOutputs class simplifies writing to additional outputs other
  * than the job default output via the <code>OutputCollector</code> passed to
  * the <code>map()</code> and <code>reduce()</code> methods of the
  * <code>Mapper</code> and <code>Reducer</code> implementations.
@@ -36,7 +36,7 @@ import java.util.*;
  * <code>OutputFormat</code>, with its own key class and with its own value
  * class.
  * <p>
- * A named output can be a single file or a multi file. The later is refered as
+ * A named output can be a single file or a multi file. The later is referred as
  * a multi named output.
  * <p>
  * A multi named output is an unbound set of files all sharing the same

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/java/org/apache/hadoop/mapred/nativetask/NativeRuntime.java

@@ -103,7 +103,7 @@ public class NativeRuntime {
   }
 
   /**
-   * destroy native object We use to destory native handlers
+   * destroy native object We use to destroy native handlers
    */
   public synchronized static void releaseNativeObject(long addr) {
     assertNativeLibraryLoaded();

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

@@ -155,7 +155,7 @@ public class QuasiMonteCarlo extends Configured implements Tool {
     /** Map method.
      * @param offset samples starting from the (offset+1)th sample.
      * @param size the number of samples for this map
-     * @param context output {ture->numInside, false->numOutside}
+     * @param context output {true->numInside, false->numOutside}
      */
     public void map(LongWritable offset,
                     LongWritable size,