HDFS-7401. Add block info to DFSInputStream' WARN message when it adds node to deadNodes (Contributed by Arshad Mohammad)

(cherry picked from commit b75df697e0)

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

@@ -482,6 +482,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8407. hdfsListDirectory must set errno to 0 on success (Masatake
     Iwasaki via Colin P. McCabe)
 
+    HDFS-7401. Add block info to DFSInputStream' WARN message when it adds
+    node to deadNodes (Arshad Mohammad via vinayakumarb)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -632,7 +632,7 @@ private synchronized DatanodeInfo blockSeekTo(long target) throws IOException {
         } else {
           connectFailedOnce = true;
           DFSClient.LOG.warn("Failed to connect to " + targetAddr + " for block "
-            + ", add to deadNodes and continue. " + ex, ex);
+            +targetBlock.getBlock()+ ", add to deadNodes and continue. " + ex, ex);
           // Put chosen node into dead list, continue
           addToDeadNodes(chosenNode);
         }