Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/6208#discussion_r198421680
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/PreviousAllocationSchedulingStrategy.java
---
@@ -0,0 +1,85 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.jobmaster.slotpool;
+
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.SlotProfile;
+import org.apache.flink.runtime.jobmanager.scheduler.Locality;
+import org.apache.flink.runtime.jobmaster.SlotContext;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import java.util.Collection;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+/**
+ * {@link SchedulingStrategy} which tries to match a slot with its
previous {@link AllocationID}.
+ * If the previous allocation cannot be found, then it returns {@code
null}. If the slot has not
+ * been scheduled before (no assigned allocation id), it will fall back to
+ * {@link LocationPreferenceSchedulingStrategy}.
+ */
+public class PreviousAllocationSchedulingStrategy extends
LocationPreferenceSchedulingStrategy {
+
+ private static final PreviousAllocationSchedulingStrategy INSTANCE =
new PreviousAllocationSchedulingStrategy();
+
+ PreviousAllocationSchedulingStrategy() {}
--- End diff --
Yes, will add it.
---
