Removed Error Log to Avoid Spam Logging (#2201)

Removed an unnecessary and misleading error log in ZkClient. This cleans up the logging and avoids clutter.
diff --git a/helix-core/src/test/java/org/apache/helix/manager/zk/TestZkBaseDataAccessor.java b/helix-core/src/test/java/org/apache/helix/manager/zk/TestZkBaseDataAccessor.java
index 0ce99d5..40abb2a 100644
--- a/helix-core/src/test/java/org/apache/helix/manager/zk/TestZkBaseDataAccessor.java
+++ b/helix-core/src/test/java/org/apache/helix/manager/zk/TestZkBaseDataAccessor.java
@@ -434,6 +434,36 @@
   }
 
   @Test
+  public void testDeleteNodeWithChildren() {
+    String root = _rootPath;
+
+    ZkBaseDataAccessor<ZNRecord> accessor = new ZkBaseDataAccessor<>(_gZkClient);
+
+    // CreateChildren
+    List<ZNRecord> records = new ArrayList<>();
+    List<String> paths = new ArrayList<>();
+    for (int i = 0; i < 10; i++) {
+      String msgId = "msg_" + i;
+      paths.add(PropertyPathBuilder.instanceMessage(root, "host_1", msgId));
+      records.add(new ZNRecord(msgId));
+    }
+    boolean[] success = accessor.createChildren(paths, records, AccessOption.PERSISTENT);
+
+    // Attempt to remove parent. Shouldn't throw an error or warning log.
+    // Should return True if recursive deletion succeeds.
+    Assert.assertTrue(accessor.remove(PropertyPathBuilder.instanceMessage(root, "host_1"), 0),
+            "Should return True despite log errors.");
+
+    // Assert child message nodes were removed when calling remove on parent
+    for (int i = 0; i < 10; i++) {
+      String msgId = "msg_" + i;
+      String path = PropertyPathBuilder.instanceMessage(root, "host_1", msgId);
+      boolean pathExists = _gZkClient.exists(path);
+      Assert.assertFalse(pathExists, "Message znode should have been removed by accessor msgId=" + msgId);
+    }
+  }
+
+  @Test
   public void testSyncGet() {
     String className = TestHelper.getTestClassName();
     String methodName = TestHelper.getTestMethodName();
diff --git a/zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java b/zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
index e483265..a24a098 100644
--- a/zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
+++ b/zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
@@ -2066,14 +2066,11 @@
         success = true;
       } catch (ZkNoNodeException e) {
         success = false;
-        if (LOG.isDebugEnabled()) {
-          LOG.debug("zkclient {}, Failed to delete path {}, znode does not exist!", _uid, path);
-        }
+        LOG.debug("zkclient {}, Failed to delete path {}, znode does not exist!", _uid, path);
       }
       record(path, null, startT, ZkClientMonitor.AccessType.WRITE);
     } catch (Exception e) {
       recordFailure(path, ZkClientMonitor.AccessType.WRITE);
-      LOG.warn("zkclient {}, Failed to delete path {}! ", _uid, path, e);
       throw e;
     } finally {
       long endT = System.currentTimeMillis();