Github user laurentgo commented on a diff in the pull request:
https://github.com/apache/drill/pull/403#discussion_r54829083
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/fragment/DistributionAffinity.java
---
@@ -0,0 +1,61 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.drill.exec.planner.fragment;
+
+/**
+ * Describes an operator's endpoint assignment requirements.
+ */
+public enum DistributionAffinity {
+ /**
+ * No affinity to any endpoints. Operator can run on any endpoint.
+ */
+ NONE(0, SoftAffinityFragmentParallelizer.INSTANCE),
+
+ /**
+ * Operator has soft distribution affinity to one or more endpoints.
Operator performs better when fragments are
+ * assigned to the endpoints with affinity, but not a mandatory
requirement.
+ */
+ SOFT(1, SoftAffinityFragmentParallelizer.INSTANCE),
+
+ /**
+ * Hard distribution affinity to one or more endpoints. Fragments having
the operator must be scheduled on the nodes
+ * with affinity.
+ */
+ HARD(2, HardAffinityFragmentParallelizer.INSTANCE);
+
+ private int level;
--- End diff --
should be final
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