HDFS-7199. DFSOutputStream should not silently drop data if DataStreamer crashes with an unchecked exception (rushabhs via cmccabe)

(cherry picked from commit 56257fab1d5a7f66bebd9149c7df0436c0a57adb)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -145,6 +145,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7324. haadmin command usage prints incorrect command name.
     (Brahma Reddy Battula via suresh)
 
+    HDFS-7199.  DFSOutputStream should not silently drop data if DataStreamer
+    crashes with an unchecked exception (rushabhs via cmccabe)
+
 Release 2.6.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java

@@ -692,6 +692,8 @@ public class DFSOutputStream extends FSOutputSummer
           }
           if (e instanceof IOException) {
             setLastException((IOException)e);
+          } else {
+            setLastException(new IOException("DataStreamer Exception: ",e));
           }
           hasError = true;
           if (errorIndex == -1 && restartingNodeIndex == -1) {