hbase-server/src/test/java/org/apache/hadoop/hbase/TestNodeHealthCheckChore.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 package org.apache.hadoop.hbase;
  19
  20 import static org.junit.Assert.assertEquals;
  21 import static org.junit.Assert.assertFalse;
  22 import static org.junit.Assert.assertTrue;
  23
  24 import java.io.File;
  25 import java.io.FileOutputStream;
  26 import java.io.IOException;
  27 import java.io.PrintWriter;
  28 import org.apache.hadoop.conf.Configuration;
  29 import org.apache.hadoop.fs.FileSystem;
  30 import org.apache.hadoop.fs.Path;
  31 import org.apache.hadoop.hbase.HealthChecker.HealthCheckerExitStatus;
  32 import org.apache.hadoop.hbase.testclassification.MiscTests;
  33 import org.apache.hadoop.hbase.testclassification.SmallTests;
  34 import org.apache.hadoop.util.Shell;
  35 import org.junit.After;
  36 import org.junit.ClassRule;
  37 import org.junit.Test;
  38 import org.junit.experimental.categories.Category;
  39 import org.slf4j.Logger;
  40 import org.slf4j.LoggerFactory;
  41
  42 @Category({MiscTests.class, SmallTests.class})
  43 public class TestNodeHealthCheckChore {
  44
  45   @ClassRule
  46   public static final HBaseClassTestRule CLASS_RULE =
  47       HBaseClassTestRule.forClass(TestNodeHealthCheckChore.class);
  48
  49   private static final Logger LOG = LoggerFactory.getLogger(TestNodeHealthCheckChore.class);
  50   private static final HBaseTestingUtil UTIL = new HBaseTestingUtil();
  51   private static final int SCRIPT_TIMEOUT = 5000;
  52   private File healthScriptFile;
  53   private String eol = System.getProperty("line.separator");
  54
  55   @After
  56   public void cleanUp() throws IOException {
  57     // delete and recreate the test directory, ensuring a clean test dir between tests
  58     Path testDir = UTIL.getDataTestDir();
  59     FileSystem fs = UTIL.getTestFileSystem();
  60     fs.delete(testDir, true);
  61     if (!fs.mkdirs(testDir)) throw new IOException("Failed mkdir " + testDir);
  62   }
  63
  64   @Test
  65   public void testHealthCheckerSuccess() throws Exception {
  66     String normalScript = "echo \"I am all fine\"";
  67     healthCheckerTest(normalScript, HealthCheckerExitStatus.SUCCESS);
  68   }
  69
  70   @Test
  71   public void testHealthCheckerFail() throws Exception {
  72     String errorScript = "echo ERROR" + eol + "echo \"Node not healthy\"";
  73     healthCheckerTest(errorScript, HealthCheckerExitStatus.FAILED);
  74   }
  75
  76   @Test
  77   public void testHealthCheckerTimeout() throws Exception {
  78     String timeOutScript = "sleep 10" + eol + "echo \"I am fine\"";
  79     healthCheckerTest(timeOutScript, HealthCheckerExitStatus.TIMED_OUT);
  80   }
  81
  82   public void healthCheckerTest(String script, HealthCheckerExitStatus expectedStatus)
  83       throws Exception {
  84     Configuration config = getConfForNodeHealthScript();
  85     config.addResource(healthScriptFile.getName());
  86     String location = healthScriptFile.getAbsolutePath();
  87     long timeout = config.getLong(HConstants.HEALTH_SCRIPT_TIMEOUT, SCRIPT_TIMEOUT);
  88
  89     HealthChecker checker = new HealthChecker();
  90     checker.init(location, timeout);
  91
  92     createScript(script, true);
  93     HealthReport report = checker.checkHealth();
  94     assertEquals(expectedStatus, report.getStatus());
  95
  96     LOG.info("Health Status:" + report.getHealthReport());
  97
  98     this.healthScriptFile.delete();
  99   }
 100
 101   @Test
 102   public void testRSHealthChore() throws Exception{
 103     Stoppable stop = new StoppableImplementation();
 104     Configuration conf = getConfForNodeHealthScript();
 105     String errorScript = "echo ERROR" + eol + " echo \"Server not healthy\"";
 106     createScript(errorScript, true);
 107     HealthCheckChore rsChore = new HealthCheckChore(100, stop, conf);
 108     try {
 109       //Default threshold is three.
 110       rsChore.chore();
 111       rsChore.chore();
 112       assertFalse("Stoppable must not be stopped.", stop.isStopped());
 113       rsChore.chore();
 114       assertTrue("Stoppable must have been stopped.", stop.isStopped());
 115     } finally {
 116       stop.stop("Finished w/ test");
 117     }
 118   }
 119
 120   private void createScript(String scriptStr, boolean setExecutable)
 121       throws Exception {
 122     if (!this.healthScriptFile.exists()) {
 123       if (!healthScriptFile.createNewFile()) {
 124         throw new IOException("Failed create of " + this.healthScriptFile);
 125       }
 126     }
 127     PrintWriter pw = new PrintWriter(new FileOutputStream(healthScriptFile));
 128     try {
 129       pw.println(scriptStr);
 130       pw.flush();
 131     } finally {
 132       pw.close();
 133     }
 134     healthScriptFile.setExecutable(setExecutable);
 135     LOG.info("Created " + this.healthScriptFile + ", executable=" + setExecutable);
 136   }
 137
 138   private Configuration getConfForNodeHealthScript() throws IOException {
 139     Configuration conf = UTIL.getConfiguration();
 140     File tempDir = new File(UTIL.getDataTestDir().toString());
 141     if (!tempDir.exists()) {
 142       if (!tempDir.mkdirs()) {
 143         throw new IOException("Failed mkdirs " + tempDir);
 144       }
 145     }
 146     String scriptName = "HealthScript" + UTIL.getRandomUUID().toString()
 147         + (Shell.WINDOWS ? ".cmd" : ".sh");
 148     healthScriptFile = new File(tempDir.getAbsolutePath(), scriptName);
 149     conf.set(HConstants.HEALTH_SCRIPT_LOC, healthScriptFile.getAbsolutePath());
 150     conf.setLong(HConstants.HEALTH_FAILURE_THRESHOLD, 3);
 151     conf.setLong(HConstants.HEALTH_SCRIPT_TIMEOUT, SCRIPT_TIMEOUT);
 152     return conf;
 153   }
 154
 155   /**
 156    * Simple helper class that just keeps track of whether or not its stopped.
 157    */
 158   private static class StoppableImplementation implements Stoppable {
 159     private volatile boolean stop = false;
 160
 161     @Override
 162     public void stop(String why) {
 163       this.stop = true;
 164     }
 165
 166     @Override
 167     public boolean isStopped() {
 168       return this.stop;
 169     }
 170
 171   }
 172 }