HDFS-11932. BPServiceActor thread name is not correctly set. Contributed by Chen Liang.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java

@@ -189,8 +189,8 @@ class BPOfferService {
       if (bpNSInfo != null) {
         return bpNSInfo.getBlockPoolID();
       } else {
-        LOG.warn("Block pool ID needed, but service not yet registered with NN",
-            new Exception("trace"));
+        LOG.warn("Block pool ID needed, but service not yet registered with " +
+                "NN, trace:", new Exception());
         return null;
       }
     } finally {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java

@@ -541,7 +541,7 @@ class BPServiceActor implements Runnable {
       //Thread is started already
       return;
     }
-    bpThread = new Thread(this, formatThreadName("heartbeating", nnAddr));
+    bpThread = new Thread(this);
     bpThread.setDaemon(true); // needed for JUnit testing
     bpThread.start();