HADOOP-13861. Spelling errors in logging and exceptions for code. Contributed by Grant Sohn.

(cherry picked from commit 7b988e88992528a0cac2ca8893652c5d4a90c6b9)

 Conflicts:
	hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/rawcoder/util/GF256.java
	hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/KDiag.java

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/ZKSignerSecretProvider.java

@@ -258,7 +258,7 @@ public class ZKSignerSecretProvider extends RolloverSignerSecretProvider {
     } catch (KeeperException.BadVersionException bve) {
       LOG.debug("Unable to push to znode; another server already did it");
     } catch (Exception ex) {
-      LOG.error("An unexpected exception occured pushing data to ZooKeeper",
+      LOG.error("An unexpected exception occurred pushing data to ZooKeeper",
               ex);
     }
   }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/LocalDirAllocator.java

@@ -525,7 +525,7 @@ public class LocalDirAllocator {
         try {
           advance();
         } catch (IOException ie) {
-          throw new RuntimeException("Can't check existance of " + next, ie);
+          throw new RuntimeException("Can't check existence of " + next, ie);
         }
         if (result == null) {
           throw new NoSuchElementException();

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/CommandFormat.java

@@ -248,7 +248,7 @@ public class CommandFormat {
     private static final long serialVersionUID = 0L;
 
     public DuplicatedOptionException(String duplicatedOption) {
-      super("option " + duplicatedOption + " already exsits!");
+      super("option " + duplicatedOption + " already exists!");
     }
   }
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/TFile.java

@@ -1789,7 +1789,7 @@ public class TFile {
         public int getKey(byte[] buf, int offset) throws IOException {
           if ((offset | (buf.length - offset - klen)) < 0) {
             throw new IndexOutOfBoundsException(
-                "Bufer not enough to store the key");
+                "Buffer not enough to store the key");
           }
           System.arraycopy(keyBuffer, 0, buf, offset, klen);
           return klen;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/Utils.java

@@ -153,7 +153,7 @@ public final class Utils {
         out.writeLong(n);
         return;
       default:
-        throw new RuntimeException("Internel error");
+        throw new RuntimeException("Internal error");
     }
   }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java

@@ -169,7 +169,7 @@ public class NetworkTopology {
       if (!isAncestor(n)) {
         throw new IllegalArgumentException(n.getName()
             + ", which is located at " + n.getNetworkLocation()
-            + ", is not a descendent of " + getPath(this));
+            + ", is not a descendant of " + getPath(this));
       }
       if (isParent(n)) {
         // this node is the parent of n; add n directly
@@ -231,7 +231,7 @@ public class NetworkTopology {
       if (!isAncestor(n)) {
         throw new IllegalArgumentException(n.getName()
             + ", which is located at " + n.getNetworkLocation()
-            + ", is not a descendent of " + getPath(this));
+            + ", is not a descendant of " + getPath(this));
       }
       if (isParent(n)) {
         // this node is the parent of n; remove n directly

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/LocalJavaKeyStoreProvider.java

@@ -151,7 +151,7 @@ public final class LocalJavaKeyStoreProvider extends
   public void flush() throws IOException {
     super.flush();
     if (LOG.isDebugEnabled()) {
-      LOG.debug("Reseting permissions to '" + permissions + "'");
+      LOG.debug("Resetting permissions to '" + permissions + "'");
     }
     if (!Shell.WINDOWS) {
       Files.setPosixFilePermissions(Paths.get(file.getCanonicalPath()),