HADOOP-11354. ThrottledInputStream doesn't perform effective throttling. Contributed by Ted Yu.

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

@@ -153,6 +153,9 @@ Release 2.7.0 - UNRELEASED
     HADOOP-11343. Overflow is not properly handled in caclulating final iv for
     AES CTR. (Jerry Chen via wang)
 
+    HADOOP-11354. ThrottledInputStream doesn't perform effective throttling.
+    (Ted Yu via jing9)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/util/ThrottledInputStream.java

@@ -115,7 +115,7 @@ public class ThrottledInputStream extends InputStream {
   }
 
   private void throttle() throws IOException {
-    if (getBytesPerSec() > maxBytesPerSec) {
+    while (getBytesPerSec() > maxBytesPerSec) {
       try {
         Thread.sleep(SLEEP_DURATION_MS);
         totalSleepTime += SLEEP_DURATION_MS;