Index: oak-segment/src/main/java/org/apache/jackrabbit/oak/plugins/segment/file/FileAccess.java
===================================================================
--- oak-segment/src/main/java/org/apache/jackrabbit/oak/plugins/segment/file/FileAccess.java	(revision 1740460)
+++ oak-segment/src/main/java/org/apache/jackrabbit/oak/plugins/segment/file/FileAccess.java	(working copy)
@@ -18,12 +18,16 @@
 
 import static com.google.common.base.Preconditions.checkState;
 import static java.nio.channels.FileChannel.MapMode.READ_ONLY;
+import static org.apache.jackrabbit.oak.commons.IOUtils.closeQuietly;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.nio.ByteBuffer;
 import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
 
+import org.apache.jackrabbit.oak.commons.IOUtils;
+
 /**
  * A wrapper around either memory mapped files or random access files, to allow
  * reading from a file.
@@ -45,10 +49,16 @@
      */
     static class Mapped extends FileAccess {
 
-        private final MappedByteBuffer buffer;
+        private final RandomAccessFile file;
 
+        private final FileChannel channel;
+
+        private MappedByteBuffer buffer;
+
         Mapped(RandomAccessFile file) throws IOException {
-            this.buffer = file.getChannel().map(READ_ONLY, 0, file.length());
+            this.file = file;
+            this.channel = file.getChannel();
+            this.buffer = channel.map(READ_ONLY, 0, file.length());
         }
 
         @Override
@@ -71,6 +81,9 @@
 
         @Override
         public void close() {
+            closeQuietly(channel);
+            closeQuietly(file);
+            buffer = null;
         }
 
     }