Add Model for FailoutProperties (#789)

* Added D2FailoutProperties model. This weakly typed model will be converted to a strongly typed model elsewhere.

d2-schemas/src/main/pegasus/com/linkedin/d2/D2FailoutProperties.pdl

@@ -0,0 +1,16 @@
+namespace com.linkedin.d2
+
+/**
+ * Loosely typed model containing data that controls the failout state an application.
+ */
+record D2FailoutProperties {
+  /**
+   * Routing data for offline partitions.
+   */
+  failoutRedirectConfigs: array[ map[string, D2FailoutPropertiesConfigValue]]
+
+  /**
+   * Batch of buckets to failout.
+   */
+  failoutBucketConfigs: array[ map[string, D2FailoutPropertiesConfigValue]]
+}

d2-schemas/src/main/pegasus/com/linkedin/d2/D2FailoutPropertiesConfigValue.pdl

@@ -0,0 +1,7 @@
+namespace com.linkedin.d2
+
+
+/**
+ * Weakly typed configValue containing failout data (Later to be converted in to a strongly typed object).
+ */
+typeref D2FailoutPropertiesConfigValue = union[longValue: long, intValue: int, stringValue: string, mapValue: map[string, int]]

d2/src/test/java/com/linkedin/d2/balancer/clients/TestBackupRequestsClient.java

@@ -62,6 +62,7 @@
 import com.linkedin.r2.transport.common.bridge.common.TransportCallback;
 import com.linkedin.r2.transport.common.bridge.common.TransportResponseImpl;
 import com.linkedin.test.util.retry.SingleRetry;
+import com.linkedin.test.util.retry.ThreeRetries;
 import com.linkedin.util.clock.SystemClock;
 import java.io.IOException;
 import java.net.URI;
@@ -233,7 +234,7 @@ public void onSuccess(StreamResponse result) {
   /**
    * Backup Request should still work when a hint is given together with the flag indicating that the hint is only a preference, not requirement.
    */
-  @Test(invocationCount = 3, dataProvider = "isD2Async", retryAnalyzer = SingleRetry.class) // Appears to be flaky in CI
+  @Test(invocationCount = 3, dataProvider = "isD2Async", retryAnalyzer = ThreeRetries.class) // Appears to be flaky in CI
   public void testRequestWithHint(boolean isD2Async) throws Exception
   {
     int responseDelayNano = 100000000; //1s till response comes back
@@ -425,7 +426,7 @@ private static long busyWaitUntil(long nextNano)
     }
   }
 
-  @Test(dataProvider = "isD2Async")
+  @Test(dataProvider = "isD2Async", retryAnalyzer = ThreeRetries.class)
   public void testStatsConsumerAddRemove(boolean isD2Async) throws Exception
   {
     AtomicReference<ServiceProperties> serviceProperties = new AtomicReference<>();