fix fabric8io#4365 correcting backoff interval

also adding stacktraces for blocking request exceptions

Author: shawkins

kubernetes-client/src/main/java/io/fabric8/kubernetes/client/dsl/internal/OperationSupport.java

@@ -83,6 +83,7 @@ public class OperationSupport {
   protected String apiGroupVersion;
   protected boolean dryRun;
   private final int requestRetryBackoffLimit;
+  private final int requestRetryBackoffInterval;
 
   public OperationSupport(Client client) {
     this(new OperationContext().withClient(client));
@@ -106,8 +107,10 @@ public OperationSupport(OperationContext ctx) {
     }
 
     if (ctx.getConfig() != null) {
+      requestRetryBackoffInterval = ctx.getConfig().getRequestRetryBackoffInterval();
       this.requestRetryBackoffLimit = ctx.getConfig().getRequestRetryBackoffLimit();
     } else {
+      requestRetryBackoffInterval = Config.DEFAULT_REQUEST_RETRY_BACKOFFINTERVAL;
       this.requestRetryBackoffLimit = Config.DEFAULT_REQUEST_RETRY_BACKOFFLIMIT;
     }
   }
@@ -508,15 +511,11 @@ protected <T> T waitForResult(CompletableFuture<T> future) throws IOException {
       if (e.getCause() != null) {
         t = e.getCause();
       }
+      // throw a new exception to preserve the calling stack trace
       if (t instanceof IOException) {
-        throw (IOException) t;
+        throw new IOException(t.getMessage(), t);
       }
-      if (t instanceof RuntimeException) {
-        throw (RuntimeException) t;
-      }
-      InterruptedIOException ie = new InterruptedIOException();
-      ie.initCause(e);
-      throw ie;
+      throw new KubernetesClientException(t.getMessage(), t);
     }
   }
 
@@ -568,7 +567,7 @@ protected <T> CompletableFuture<T> handleResponse(HttpClient client, HttpRequest
     HttpRequest request = requestBuilder.build();
     CompletableFuture<HttpResponse<byte[]>> futureResponse = new CompletableFuture<>();
     retryWithExponentialBackoff(futureResponse,
-        new ExponentialBackoffIntervalCalculator(requestRetryBackoffLimit, MAX_RETRY_INTERVAL_EXPONENT),
+        new ExponentialBackoffIntervalCalculator(requestRetryBackoffInterval, MAX_RETRY_INTERVAL_EXPONENT),
         Utils.getNonNullOrElse(client, httpClient), request);
 
     return futureResponse.thenApply(response -> {

kubernetes-client/src/test/java/io/fabric8/kubernetes/client/dsl/internal/BaseOperationTest.java

@@ -296,6 +296,7 @@ void testNoHttpRetryWithDefaultConfig() {
   void testHttpRetryWithMoreFailuresThanRetries() {
     final AtomicInteger httpExecutionCounter = new AtomicInteger(0);
     HttpClient mockClient = newHttpClientWithSomeFailures(httpExecutionCounter, 1000);
+    long start = System.currentTimeMillis();
     BaseOperation<Pod, PodList, Resource<Pod>> baseOp = new BaseOperation(new OperationContext()
         .withClient(mockClient(mockClient,
             new ConfigBuilder().withMasterUrl("https://172.17.0.2:8443").withNamespace("default")
@@ -309,7 +310,10 @@ void testHttpRetryWithMoreFailuresThanRetries() {
       Pod result = baseOp.get();
     });
 
+    long stop = System.currentTimeMillis();
+
     // Then
+    assertTrue(stop - start >= 700); //100+200+400
     assertTrue(exception.getMessage().contains("Internal Server Error"),
         "As the last failure, the 3rd one, is not an IOException the message expected to contain: 'Internal Server Error'!");
     assertEquals(4, httpExecutionCounter.get(), "Expected 4 calls: one normal try and 3 backoff retries!");