Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/6071#discussion_r191379687
--- Diff:
flink-tests/src/test/java/org/apache/flink/test/runtime/NettyEpollITCase.java
---
@@ -0,0 +1,103 @@
+/*
+ * 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.test.runtime;
+
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.test.util.MiniClusterResource;
+import
org.apache.flink.test.util.MiniClusterResource.MiniClusterResourceConfiguration;
+import org.apache.flink.util.TestLogger;
+
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Optional;
+
+import static
org.apache.flink.runtime.io.network.netty.NettyConfig.TRANSPORT_TYPE;
+import static
org.apache.flink.util.ExceptionUtils.findThrowableWithMessage;
+
+/**
+ * Test network stack with taskmanager.network.netty.transport set to
epoll. This test car only run
+ * on linux. On other platforms it's basically a NO-OP. See
+ * https://github.com/apache/flink-shaded/issues/30
+ */
+public class NettyEpollITCase extends TestLogger {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(NettyEpollITCase.class);
+
+ private static final int TASK_MANAGERES = 2;
--- End diff --
`NUM_TASK_MANAGERS`, also a type
---
