HDFS-2334. Merging change r1195620 from trunk to 0.23

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1297858 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -100,6 +100,8 @@ Release 0.23.3 - UNRELEASED
 
     HDFS-2158. Add JournalSet to manage the set of journals. (jitendra)
 
+    HDFS-2334. Add Closeable to JournalManager. (Ivan Kelly via jitendra)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java

@@ -76,6 +76,9 @@ class BackupJournalManager implements JournalManager {
   public void recoverUnfinalizedSegments() throws IOException {
   }
 
+  @Override 
+  public void close() throws IOException {}
+
   public boolean matchesRegistration(NamenodeRegistration bnReg) {
     return bnReg.getAddress().equals(this.bnReg.getAddress());
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLog.java

@@ -215,6 +215,12 @@ public class FSEditLog  {
       waitForSyncToFinish();
       endCurrentLogSegment(true);
     }
+    
+    try {
+      journalSet.close();
+    } catch (IOException ioe) {
+      LOG.warn("Error closing journalSet", ioe);
+    }
 
     state = State.CLOSED;
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FileJournalManager.java

@@ -70,6 +70,9 @@ class FileJournalManager implements JournalManager {
     this.sd = sd;
   }
 
+  @Override 
+  public void close() throws IOException {}
+
   @Override
   synchronized public EditLogOutputStream startLogSegment(long txid) 
       throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/JournalManager.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.hdfs.server.namenode;
 
+import java.io.Closeable;
 import java.io.IOException;
 
 
@@ -27,7 +28,7 @@ import java.io.IOException;
  * each conceptual place of storage corresponds to exactly one instance of
  * this class, which is created when the EditLog is first opened.
  */
-interface JournalManager {
+interface JournalManager extends Closeable {
   /**
    * Begin writing to a new segment of the log stream, which starts at
    * the given transaction ID.
@@ -81,6 +82,11 @@ interface JournalManager {
    */
   void recoverUnfinalizedSegments() throws IOException;
 
+  /**
+   * Close the journal manager, freeing any resources it may hold.
+   */
+  void close() throws IOException;
+
   /** 
    * Indicate that a journal is cannot be used to load a certain range of 
    * edits.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/JournalSet.java

@@ -72,11 +72,20 @@ public class JournalSet implements JournalManager {
     /**
      * Closes the stream, also sets it to null.
      */
-    public void close() throws IOException {
+    public void closeStream() throws IOException {
       if (stream == null) return;
       stream.close();
       stream = null;
     }
+
+    /**
+     * Close the Journal and Stream
+     */
+    public void close() throws IOException {
+      closeStream();
+
+      journal.close();
+    }
     
     /**
      * Aborts the stream, also sets it to null.
@@ -145,13 +154,23 @@ public class JournalSet implements JournalManager {
       @Override
       public void apply(JournalAndStream jas) throws IOException {
         if (jas.isActive()) {
-          jas.close();
+          jas.closeStream();
           jas.getManager().finalizeLogSegment(firstTxId, lastTxId);
         }
       }
     }, "finalize log segment " + firstTxId + ", " + lastTxId);
   }
-  
+   
+  @Override
+  public void close() throws IOException {
+    mapJournalsAndReportErrors(new JournalClosure() {
+      @Override
+      public void apply(JournalAndStream jas) throws IOException {
+        jas.close();
+      }
+    }, "close journal");
+  }
+
   
   /**
    * Find the best editlog input stream to read from txid.
@@ -332,7 +351,7 @@ public class JournalSet implements JournalManager {
       mapJournalsAndReportErrors(new JournalClosure() {
         @Override
         public void apply(JournalAndStream jas) throws IOException {
-          jas.close();
+          jas.closeStream();
         }
       }, "close");
     }