HADOOP-7997. svn merge -c 1236456 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1236461 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -164,6 +164,9 @@ Release 0.23.1 - Unreleased
    HADOOP-7981. Improve documentation for org.apache.hadoop.io.compress.
    Decompressor.getRemaining (Jonathan Eagles via mahadev)
 
+   HADOOP-7997. SequenceFile.createWriter(...createParent...) no
+   longer works on existing file. (Gregory Chanan via eli)
+
 Release 0.23.0 - 2011-11-01 
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/SequenceFile.java

@@ -467,7 +467,7 @@ public class SequenceFile {
                Metadata metadata) throws IOException {
     return createWriter(FileContext.getFileContext(fs.getUri(), conf),
         conf, name, keyClass, valClass, compressionType, codec,
-        metadata, EnumSet.of(CreateFlag.CREATE),
+        metadata, EnumSet.of(CreateFlag.CREATE,CreateFlag.OVERWRITE),
         CreateOpts.bufferSize(bufferSize),
         createParent ? CreateOpts.createParent()
                      : CreateOpts.donotCreateParent(),

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/TestSequenceFile.java

@@ -517,6 +517,23 @@ public class TestSequenceFile extends TestCase {
     assertTrue("InputStream for " + path + " should have been closed.", openedFile[0].isClosed());
   }
 
+   /**
+   * Test that makes sure createWriter succeeds on a file that was 
+   * already created
+   * @throws IOException
+   */
+  public void testCreateWriterOnExistingFile() throws IOException {
+    Configuration conf = new Configuration();
+    FileSystem fs = FileSystem.getLocal(conf);
+    Path name = new Path(new Path(System.getProperty("test.build.data","."),
+        "createWriterOnExistingFile") , "file");
+
+    fs.create(name);
+    SequenceFile.createWriter(fs, conf, name, RandomDatum.class,
+        RandomDatum.class, 512, (short) 1, 4096, false,
+        CompressionType.NONE, null, new Metadata());
+  }
+
   public void testRecursiveSeqFileCreate() throws IOException {
     Configuration conf = new Configuration();
     FileSystem fs = FileSystem.getLocal(conf);