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https://issues.apache.org/jira/browse/APEXCORE-10?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212719#comment-15212719
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ASF GitHub Bot commented on APEXCORE-10:
----------------------------------------
Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/250#discussion_r57507141
--- Diff: api/src/main/java/com/datatorrent/api/AffinityRule.java ---
@@ -0,0 +1,211 @@
+/**
+ * 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 com.datatorrent.api;
+
+import java.io.Serializable;
+import java.util.List;
+
+import com.datatorrent.api.DAG.Locality;
+
+/**
+ * Affinity rule specifies constraints for physical deployment of operator
+ * containers. There are two types of rules that can be specified:
Affinity and
+ * Anti-affinity. Each rule contains list of operators or pair of 2
operators or
+ * a regex that should match at least 2 operators. Based on the type of
rule,
+ * affinity or anti-affinity, the operators will be deployed together or
away
+ * from each other. The locality indicates the level at which the rule
should be
+ * applied. E.g. CONTAINER_LOCAL affinity would indicate operators Should
be
+ * allocated within same container NODE_LOCAL anti-affinity indicates that
the
+ * operators should not be allocated on the same node. The rule can be
either
+ * strict or relaxed.
+ *
+ */
+public class AffinityRule implements Serializable
+{
+ @Override
+ public String toString()
+ {
+ return "AffinityRule {operatorsList=" + operatorsList + ",
operatorRegex=" + operatorRegex + ", operators="
+ + operators + ", locality=" + locality + ", type=" + type + ",
relaxLocality=" + relaxLocality + "}";
+ }
+
+ private static final long serialVersionUID = 107131504929875386L;
+
+ /**
+ * Pair of operator names to specify affinity rule
+ * The order of operators is not considered in this class
+ * i.e. OperatorPair("O1", "O2") is equal to OperatorPair("O2", "O1")
+ */
+ public static class OperatorPair implements Serializable
--- End diff --
It's fine to use pair internally, but maybe it is not needed in the API?
varargs looks more appropriate.
> Enable non-affinity of operators per node (not containers)
> ----------------------------------------------------------
>
> Key: APEXCORE-10
> URL: https://issues.apache.org/jira/browse/APEXCORE-10
> Project: Apache Apex Core
> Issue Type: Task
> Reporter: Amol Kekre
> Assignee: Isha Arkatkar
> Labels: roadmap
>
> The issue happens on cloud which provides virtual cores with software like
> Xen underneath. In effect if CPU intensive operators land up on same node we
> have a resource bottleneck,
> Need to create an attribute that does the following
> - Operators A & B should not be on same node
> - Stram should use this attribute to try to get containers on different node
> It is understood that the user is making an explicit choice to use NIC
> instead of stream local optimization
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