agent: reconnect after waiting 5 seconds (#9258)

* agent: reconnect after waiting 5 seconds

* Update agent/src/main/java/com/cloud/agent/Agent.java

* Update agent/src/main/java/com/cloud/agent/Agent.java

Co-authored-by: Suresh Kumar Anaparti <sureshkumar.anaparti@gmail.com>

Author: weizhouapache

agent/src/main/java/com/cloud/agent/Agent.java

@@ -1141,6 +1141,12 @@ public void doTask(final Task task) throws TaskExecutionException {
                     s_logger.error("Error parsing task", e);
                 }
             } else if (task.getType() == Task.Type.DISCONNECT) {
+                try {
+                    // an issue has been found if reconnect immediately after disconnecting. please refer to https://github.com/apache/cloudstack/issues/8517
+                    // wait 5 seconds before reconnecting
+                    Thread.sleep(5000);
+                } catch (InterruptedException e) {
+                }
                 reconnect(task.getLink());
                 return;
             } else if (task.getType() == Task.Type.OTHER) {