Github user chtyim commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r82899928
--- Diff:
twill-yarn/src/test/java/org/apache/twill/yarn/LogLevelChangeTestRun.java ---
@@ -0,0 +1,237 @@
+/*
+ * 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.twill.yarn;
+
+import com.google.common.base.Stopwatch;
+import com.google.common.collect.ImmutableMap;
+import org.apache.twill.api.AbstractTwillRunnable;
+import org.apache.twill.api.ResourceReport;
+import org.apache.twill.api.TwillApplication;
+import org.apache.twill.api.TwillController;
+import org.apache.twill.api.TwillRunResources;
+import org.apache.twill.api.TwillSpecification;
+import org.apache.twill.api.logging.LogEntry;
+import org.apache.twill.api.logging.PrinterLogHandler;
+import org.apache.twill.common.Threads;
+import org.junit.Assert;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.PrintWriter;
+import java.util.Map;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Test changing log level for a twill runnable.
+ */
+public class LogLevelChangeTestRun extends BaseYarnTest {
+ public static final Logger LOG =
LoggerFactory.getLogger(LogLevelChangeTestRun.class);
+
+ /**
+ * Twill runnable.
+ */
+ public static final class LogLevelTestRunnable extends
AbstractTwillRunnable {
+ public static final Logger LOG =
LoggerFactory.getLogger(LogLevelChangeTestRun.LogLevelTestRunnable.class);
+
+ private volatile Thread runThread;
+
+ @Override
+ public void run() {
+ this.runThread = Thread.currentThread();
+
+ // check if the initial log level is DEBUG
+ Assert.assertTrue(LOG.isDebugEnabled() && !LOG.isTraceEnabled());
+
+ int i = 0;
+ while (!Thread.interrupted()) {
--- End diff --
Without sleeping/pausing, the thread can take up all CPU resources, causing
starvation for other threads. On machine with single core, unit-test could fail
due to this.
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