Merge -r 628523:628524 from trunk to branch 0.16 to fix HADOOP-2843.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.16@628525 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -53,6 +53,9 @@ Release 0.16.1 - Unrelease
     HADOOP-2735. Enables setting TMPDIR for tasks. 
     (Amareshwari Sri Ramadasu via ddas)
 
+    HADOOP-2843. Fix protections on map-side join classes to enable derivation.
+    (cdouglas via omalley)
+
 Release 0.16.0 - 2008-02-07
 
   INCOMPATIBLE CHANGES

src/java/org/apache/hadoop/mapred/join/ComposableRecordReader.java

@@ -27,7 +27,7 @@ import org.apache.hadoop.mapred.RecordReader;
 /**
  * Additional operations required of a RecordReader to participate in a join.
  */
-interface ComposableRecordReader<K extends WritableComparable,
+public interface ComposableRecordReader<K extends WritableComparable,
                                  V extends Writable>
     extends RecordReader<K,V>, Comparable<ComposableRecordReader<K,?>> {
 

src/java/org/apache/hadoop/mapred/join/WrappedRecordReader.java

@@ -32,7 +32,7 @@ import org.apache.hadoop.mapred.RecordReader;
  * provided RecordReader and keeps a store of values matching a key when
  * this source is participating in a join.
  */
-class WrappedRecordReader<K extends WritableComparable,
+public class WrappedRecordReader<K extends WritableComparable,
                           U extends Writable>
     implements ComposableRecordReader<K,U> {