HADOOP-19043. Code review; print stream which doesn't make closed/ope…

…n assert.

Change-Id: I35ba5f0b6cba67967dc945326944cb2cf942c2e8

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/performance/ITestS3AOpenCost.java

@@ -477,21 +477,21 @@ private static void assertS3StreamClosed(final FSDataInputStream in) {
     if (wrapped instanceof S3AInputStream) {
       S3AInputStream s3ain = (S3AInputStream) wrapped;
       Assertions.assertThat(s3ain.isObjectStreamOpen())
-          .describedAs("stream is open")
+          .describedAs("stream is open: %s", s3ain)
           .isFalse();
     }
   }
 
   /**
-   * Assert that the inner S3 Stream is open.
+   * Assert that the inner S3 Stream is closed.
    * @param in input stream
    */
   private static void assertS3StreamOpen(final FSDataInputStream in) {
     final InputStream wrapped = in.getWrappedStream();
     if (wrapped instanceof S3AInputStream) {
       S3AInputStream s3ain = (S3AInputStream) wrapped;
       Assertions.assertThat(s3ain.isObjectStreamOpen())
-          .describedAs("stream is closed")
+          .describedAs("stream is closed: %s", s3ain)
           .isTrue();
     }
   }