Reverted MAPREDUCE-4253 from branch-2.0.2-alpha.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.0.2-alpha@1390662 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -43,9 +43,6 @@ Release 2.0.2-alpha - 2012-09-07
     MAPREDUCE-3921. MR AM should act on node health status changes. 
     (Bikas Saha via sseth)
 
-    MAPREDUCE-4253. Tests for mapreduce-client-core are lying under
-    mapreduce-client-jobclient (Tsuyoshi Ozawa via harsh)
-
     MAPREDUCE-4355. Add RunningJob.getJobStatus() (kkambatl via tucu)
 
     MAPREDUCE-4427. Added an 'unmanaged' mode for AMs so as to ease

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestIndexCache.java

@@ -0,0 +1,324 @@
+/**
+ * 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.hadoop.mapred;
+
+import java.io.DataOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Random;
+import java.util.zip.CRC32;
+import java.util.zip.CheckedOutputStream;
+
+import org.apache.hadoop.fs.ChecksumException;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.mapreduce.server.tasktracker.TTConfig;
+
+import junit.framework.TestCase;
+
+public class TestIndexCache extends TestCase {
+  private JobConf conf;
+  private FileSystem fs;
+  private Path p;
+
+  @Override
+  public void setUp() throws IOException {
+    conf = new JobConf();
+    fs = FileSystem.getLocal(conf).getRaw();
+    p =  new Path(System.getProperty("test.build.data", "/tmp"),
+        "cache").makeQualified(fs.getUri(), fs.getWorkingDirectory());
+  }
+
+  public void testLRCPolicy() throws Exception {
+    Random r = new Random();
+    long seed = r.nextLong();
+    r.setSeed(seed);
+    System.out.println("seed: " + seed);
+    fs.delete(p, true);
+    conf.setInt(TTConfig.TT_INDEX_CACHE, 1);
+    final int partsPerMap = 1000;
+    final int bytesPerFile = partsPerMap * 24;
+    IndexCache cache = new IndexCache(conf);
+
+    // fill cache
+    int totalsize = bytesPerFile;
+    for (; totalsize < 1024 * 1024; totalsize += bytesPerFile) {
+      Path f = new Path(p, Integer.toString(totalsize, 36));
+      writeFile(fs, f, totalsize, partsPerMap);
+      IndexRecord rec = cache.getIndexInformation(
+        Integer.toString(totalsize, 36), r.nextInt(partsPerMap), f,
+        UserGroupInformation.getCurrentUser().getShortUserName());
+      checkRecord(rec, totalsize);
+    }
+
+    // delete files, ensure cache retains all elem
+    for (FileStatus stat : fs.listStatus(p)) {
+      fs.delete(stat.getPath(),true);
+    }
+    for (int i = bytesPerFile; i < 1024 * 1024; i += bytesPerFile) {
+      Path f = new Path(p, Integer.toString(i, 36));
+      IndexRecord rec = cache.getIndexInformation(Integer.toString(i, 36),
+        r.nextInt(partsPerMap), f,
+        UserGroupInformation.getCurrentUser().getShortUserName());
+      checkRecord(rec, i);
+    }
+
+    // push oldest (bytesPerFile) out of cache
+    Path f = new Path(p, Integer.toString(totalsize, 36));
+    writeFile(fs, f, totalsize, partsPerMap);
+    cache.getIndexInformation(Integer.toString(totalsize, 36),
+        r.nextInt(partsPerMap), f,
+        UserGroupInformation.getCurrentUser().getShortUserName());
+    fs.delete(f, false);
+
+    // oldest fails to read, or error
+    boolean fnf = false;
+    try {
+      cache.getIndexInformation(Integer.toString(bytesPerFile, 36),
+        r.nextInt(partsPerMap), new Path(p, Integer.toString(bytesPerFile)),
+        UserGroupInformation.getCurrentUser().getShortUserName());
+    } catch (IOException e) {
+      if (e.getCause() == null ||
+          !(e.getCause()  instanceof FileNotFoundException)) {
+        throw e;
+      }
+      else {
+        fnf = true;
+      }
+    }
+    if (!fnf)
+      fail("Failed to push out last entry");
+    // should find all the other entries
+    for (int i = bytesPerFile << 1; i < 1024 * 1024; i += bytesPerFile) {
+      IndexRecord rec = cache.getIndexInformation(Integer.toString(i, 36),
+          r.nextInt(partsPerMap), new Path(p, Integer.toString(i, 36)),
+          UserGroupInformation.getCurrentUser().getShortUserName());
+      checkRecord(rec, i);
+    }
+    IndexRecord rec = cache.getIndexInformation(Integer.toString(totalsize, 36),
+      r.nextInt(partsPerMap), f,
+      UserGroupInformation.getCurrentUser().getShortUserName());
+
+    checkRecord(rec, totalsize);
+  }
+
+  public void testBadIndex() throws Exception {
+    final int parts = 30;
+    fs.delete(p, true);
+    conf.setInt(TTConfig.TT_INDEX_CACHE, 1);
+    IndexCache cache = new IndexCache(conf);
+
+    Path f = new Path(p, "badindex");
+    FSDataOutputStream out = fs.create(f, false);
+    CheckedOutputStream iout = new CheckedOutputStream(out, new CRC32());
+    DataOutputStream dout = new DataOutputStream(iout);
+    for (int i = 0; i < parts; ++i) {
+      for (int j = 0; j < MapTask.MAP_OUTPUT_INDEX_RECORD_LENGTH / 8; ++j) {
+        if (0 == (i % 3)) {
+          dout.writeLong(i);
+        } else {
+          out.writeLong(i);
+        }
+      }
+    }
+    out.writeLong(iout.getChecksum().getValue());
+    dout.close();
+    try {
+      cache.getIndexInformation("badindex", 7, f,
+        UserGroupInformation.getCurrentUser().getShortUserName());
+      fail("Did not detect bad checksum");
+    } catch (IOException e) {
+      if (!(e.getCause() instanceof ChecksumException)) {
+        throw e;
+      }
+    }
+  }
+
+  public void testInvalidReduceNumberOrLength() throws Exception {
+    fs.delete(p, true);
+    conf.setInt(TTConfig.TT_INDEX_CACHE, 1);
+    final int partsPerMap = 1000;
+    final int bytesPerFile = partsPerMap * 24;
+    IndexCache cache = new IndexCache(conf);
+
+    // fill cache
+    Path feq = new Path(p, "invalidReduceOrPartsPerMap");
+    writeFile(fs, feq, bytesPerFile, partsPerMap);
+
+    // Number of reducers should always be less than partsPerMap as reducer
+    // numbers start from 0 and there cannot be more reducer than parts
+
+    try {
+      // Number of reducers equal to partsPerMap
+      cache.getIndexInformation("reduceEqualPartsPerMap", 
+               partsPerMap, // reduce number == partsPerMap
+               feq, UserGroupInformation.getCurrentUser().getShortUserName());
+      fail("Number of reducers equal to partsPerMap did not fail");
+    } catch (Exception e) {
+      if (!(e instanceof IOException)) {
+        throw e;
+      }
+    }
+
+    try {
+      // Number of reducers more than partsPerMap
+      cache.getIndexInformation(
+      "reduceMorePartsPerMap", 
+      partsPerMap + 1, // reduce number > partsPerMap
+      feq, UserGroupInformation.getCurrentUser().getShortUserName());
+      fail("Number of reducers more than partsPerMap did not fail");
+    } catch (Exception e) {
+      if (!(e instanceof IOException)) {
+        throw e;
+      }
+    }
+  }
+
+  public void testRemoveMap() throws Exception {
+    // This test case use two thread to call getIndexInformation and 
+    // removeMap concurrently, in order to construct race condition.
+    // This test case may not repeatable. But on my macbook this test 
+    // fails with probability of 100% on code before MAPREDUCE-2541,
+    // so it is repeatable in practice.
+    fs.delete(p, true);
+    conf.setInt(TTConfig.TT_INDEX_CACHE, 10);
+    // Make a big file so removeMapThread almost surely runs faster than 
+    // getInfoThread 
+    final int partsPerMap = 100000;
+    final int bytesPerFile = partsPerMap * 24;
+    final IndexCache cache = new IndexCache(conf);
+
+    final Path big = new Path(p, "bigIndex");
+    final String user = 
+      UserGroupInformation.getCurrentUser().getShortUserName();
+    writeFile(fs, big, bytesPerFile, partsPerMap);
+    
+    // run multiple times
+    for (int i = 0; i < 20; ++i) {
+      Thread getInfoThread = new Thread() {
+        @Override
+        public void run() {
+          try {
+            cache.getIndexInformation("bigIndex", partsPerMap, big, user);
+          } catch (Exception e) {
+            // should not be here
+          }
+        }
+      };
+      Thread removeMapThread = new Thread() {
+        @Override
+        public void run() {
+          cache.removeMap("bigIndex");
+        }
+      };
+      if (i%2==0) {
+        getInfoThread.start();
+        removeMapThread.start();        
+      } else {
+        removeMapThread.start();        
+        getInfoThread.start();
+      }
+      getInfoThread.join();
+      removeMapThread.join();
+      assertEquals(true, cache.checkTotalMemoryUsed());
+    }      
+  }
+  
+  public void testCreateRace() throws Exception {
+    fs.delete(p, true);
+    conf.setInt(TTConfig.TT_INDEX_CACHE, 1);
+    final int partsPerMap = 1000;
+    final int bytesPerFile = partsPerMap * 24;
+    final IndexCache cache = new IndexCache(conf);
+    
+    final Path racy = new Path(p, "racyIndex");
+    final String user =  
+      UserGroupInformation.getCurrentUser().getShortUserName();
+    writeFile(fs, racy, bytesPerFile, partsPerMap);
+
+    // run multiple instances
+    Thread[] getInfoThreads = new Thread[50];
+    for (int i = 0; i < 50; i++) {
+      getInfoThreads[i] = new Thread() {
+        @Override
+        public void run() {
+          try {
+            cache.getIndexInformation("racyIndex", partsPerMap, racy, user);
+            cache.removeMap("racyIndex");
+          } catch (Exception e) {
+            // should not be here
+          }
+        }
+      };
+    }
+
+    for (int i = 0; i < 50; i++) {
+      getInfoThreads[i].start();
+    }
+
+    final Thread mainTestThread = Thread.currentThread();
+
+    Thread timeoutThread = new Thread() {
+      @Override
+      public void run() {
+        try {
+          Thread.sleep(15000);
+          mainTestThread.interrupt();
+        } catch (InterruptedException ie) {
+          // we are done;
+        }
+      }
+    };
+
+    for (int i = 0; i < 50; i++) {
+      try {
+        getInfoThreads[i].join();
+      } catch (InterruptedException ie) {
+        // we haven't finished in time. Potential deadlock/race.
+        fail("Unexpectedly long delay during concurrent cache entry creations");
+      }
+    }
+    // stop the timeoutThread. If we get interrupted before stopping, there
+    // must be something wrong, although it wasn't a deadlock. No need to
+    // catch and swallow.
+    timeoutThread.interrupt();
+  }
+
+  private static void checkRecord(IndexRecord rec, long fill) {
+    assertEquals(fill, rec.startOffset);
+    assertEquals(fill, rec.rawLength);
+    assertEquals(fill, rec.partLength);
+  }
+
+  private static void writeFile(FileSystem fs, Path f, long fill, int parts)
+      throws IOException {
+    FSDataOutputStream out = fs.create(f, false);
+    CheckedOutputStream iout = new CheckedOutputStream(out, new CRC32());
+    DataOutputStream dout = new DataOutputStream(iout);
+    for (int i = 0; i < parts; ++i) {
+      for (int j = 0; j < MapTask.MAP_OUTPUT_INDEX_RECORD_LENGTH / 8; ++j) {
+        dout.writeLong(fill);
+      }
+    }
+    out.writeLong(iout.getChecksum().getValue());
+    dout.close();
+  }
+}