Exponential back off in retry logic in case of http status code 0 (no response) (#2300)

* Exponential backoff during retry in case of http status code 0 (no response).

Author: ankedia

operator/src/main/java/oracle/kubernetes/operator/calls/AsyncRequestStep.java

@@ -430,8 +430,6 @@ public NextAction doPotentialRetry(Step conflictStep, Packet packet, int statusC
         NextAction na = new NextAction();
         if (!retriesLeft()) {
           return null;
-        } else if (statusCode == 0) {
-          na.invoke(retryStep, packet);
         } else {
           LOGGER.finer(MessageKeys.ASYNC_RETRY, identityHash(), String.valueOf(waitTime),
               requestParams.call, requestParams.namespace, requestParams.name);

operator/src/test/java/oracle/kubernetes/operator/calls/AsyncRequestStepTest.java

@@ -104,7 +104,7 @@ public void afterFiberStarted_timeoutStepScheduled() {
   public void afterTimeout_newRequestSent() {
     callFactory.clearRequest();
 
-    testSupport.setTime(TIMEOUT_SECONDS, TimeUnit.SECONDS);
+    testSupport.setTime(TIMEOUT_SECONDS + 1, TimeUnit.SECONDS);
 
     assertTrue(callFactory.invokedWith(requestParams));
   }
@@ -158,22 +158,14 @@ public void afterFailedCallback_retrySentAfterDelay() {
 
   @Test
   public void afterMultipleRetriesAndSuccessfulCallback_nextStepAppliedWithValue() {
-    sendMultipleFailedCallback(0, 2);
+    sendMultipleFailedCallbackWithSetTime(0, 2);
     testSupport.schedule(() -> callFactory.sendSuccessfulCallback(smallList));
     assertThat(nextStep.result, equalTo(smallList));
   }
 
-  @SuppressWarnings("SameParameterValue")
-  private void sendMultipleFailedCallback(int statusCode, int maxRetries) {
-    for (int retryCount = 0; retryCount < maxRetries; retryCount++) {
-      testSupport.schedule(
-          () -> callFactory.sendFailedCallback(new ApiException("test failure"), statusCode));
-    }
-  }
-
   @Test
   public void afterRetriesExhausted_fiberTerminatesWithException() {
-    sendMultipleFailedCallback(0, 3);
+    sendMultipleFailedCallbackWithSetTime(0, 3);
 
     testSupport.verifyCompletionThrowable(FailureStatusSourceException.class);
   }