YARN-9808. Zero length files in container log output haven't got a header. Contributed by Adam Antal

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/cli/TestLogsCLI.java

@@ -36,6 +36,7 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
+import com.google.common.collect.ImmutableList;
 import com.sun.jersey.api.client.Client;
 import com.sun.jersey.api.client.ClientResponse;
 import com.sun.jersey.api.client.ClientResponse.Status;
@@ -52,6 +53,7 @@ import java.io.Writer;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -93,9 +95,14 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class TestLogsCLI {
 
+  private static final Logger LOG =
+      LoggerFactory.getLogger(TestLogsCLI.class);
+
   ByteArrayOutputStream sysOutStream;
   private PrintStream sysOut;
 
@@ -402,13 +409,15 @@ public class TestLogsCLI {
     List<String> logTypes = new ArrayList<String>();
     logTypes.add("syslog");
     // create container logs in localLogDir
-    createContainerLogInLocalDir(appLogsDir, containerId1, fs, logTypes);
-    createContainerLogInLocalDir(appLogsDir, containerId2, fs, logTypes);
-
+    createContainerLogInLocalDir(appLogsDir, containerId1, fs, logTypes,
+        ImmutableList.of("empty"));
+    createContainerLogInLocalDir(appLogsDir, containerId2, fs, logTypes,
+        Collections.emptyList());
     // create two logs for container3 in localLogDir
     logTypes.add("stdout");
     logTypes.add("stdout1234");
-    createContainerLogInLocalDir(appLogsDir, containerId3, fs, logTypes);
+    createContainerLogInLocalDir(appLogsDir, containerId3, fs, logTypes,
+        Collections.emptyList());
 
     Path path =
         new Path(remoteLogRootDir + ugi.getShortUserName()
@@ -449,6 +458,7 @@ public class TestLogsCLI {
     cli.setConf(configuration);
 
     int exitCode = cli.run(new String[] { "-applicationId", appId.toString() });
+    LOG.info(sysOutStream.toString());
     assertTrue(exitCode == 0);
     assertTrue(sysOutStream.toString().contains(
         logMessage(containerId1, "syslog")));
@@ -460,6 +470,8 @@ public class TestLogsCLI {
         logMessage(containerId3, "stdout")));
     assertTrue(sysOutStream.toString().contains(
         logMessage(containerId3, "stdout1234")));
+    assertTrue(sysOutStream.toString().contains(
+        createEmptyLog("empty")));
     sysOutStream.reset();
 
     exitCode = cli.run(new String[] {"-applicationId", appId.toString(),
@@ -475,6 +487,8 @@ public class TestLogsCLI {
         logMessage(containerId3, "stdout")));
     assertTrue(sysOutStream.toString().contains(
         logMessage(containerId3, "stdout1234")));
+    assertTrue(sysOutStream.toString().contains(
+        createEmptyLog("empty")));
     sysOutStream.reset();
 
     exitCode = cli.run(new String[] {"-applicationId", appId.toString(),
@@ -490,6 +504,8 @@ public class TestLogsCLI {
         logMessage(containerId3, "stdout")));
     assertTrue(sysOutStream.toString().contains(
         logMessage(containerId3, "stdout1234")));
+    assertTrue(sysOutStream.toString().contains(
+        createEmptyLog("empty")));
     int fullSize = sysOutStream.toByteArray().length;
     sysOutStream.reset();
 
@@ -506,6 +522,8 @@ public class TestLogsCLI {
         logMessage(containerId3, "stdout")));
     assertFalse(sysOutStream.toString().contains(
         logMessage(containerId3, "stdout1234")));
+    assertFalse(sysOutStream.toString().contains(
+        createEmptyLog("empty")));
     sysOutStream.reset();
 
     exitCode = cli.run(new String[] {"-applicationId", appId.toString(),
@@ -521,6 +539,8 @@ public class TestLogsCLI {
         logMessage(containerId3, "stdout")));
     assertTrue(sysOutStream.toString().contains(
         logMessage(containerId3, "stdout1234")));
+    assertFalse(sysOutStream.toString().contains(
+        createEmptyLog("empty")));
     sysOutStream.reset();
 
     exitCode = cli.run(new String[] {"-applicationId", appId.toString(),
@@ -591,6 +611,15 @@ public class TestLogsCLI {
         (fullContextSize - fileContentSize - tailContentSize), 5));
     sysOutStream.reset();
 
+    // specify how many bytes we should get from an empty log
+    exitCode = cli.run(new String[] {"-applicationId", appId.toString(),
+        "-containerId", containerId1.toString(), "-log_files", "empty",
+        "-size", "5"});
+    assertTrue(exitCode == 0);
+    assertTrue(sysOutStream.toString().contains(
+        createEmptyLog("empty")));
+    sysOutStream.reset();
+
     // specify a negative number, it would get the last n bytes from
     // container log
     exitCode = cli.run(new String[] {"-applicationId", appId.toString(),
@@ -794,7 +823,8 @@ public class TestLogsCLI {
     List<String> logTypes = new ArrayList<String>();
     logTypes.add(fileName);
     // create container logs in localLogDir
-    createContainerLogInLocalDir(appLogsDir, containerId1, fs, logTypes);
+    createContainerLogInLocalDir(appLogsDir, containerId1, fs, logTypes,
+        Collections.emptyList());
 
     Path containerDirPath = new Path(appLogsDir, containerId1.toString());
     Path logPath = new Path(containerDirPath, fileName);
@@ -968,7 +998,8 @@ public class TestLogsCLI {
       logTypes.add("syslog");
 
       // create container logs in localLogDir for app
-      createContainerLogInLocalDir(appLogsDir, containerId, fs, logTypes);
+      createContainerLogInLocalDir(appLogsDir, containerId, fs, logTypes,
+          Collections.emptyList());
 
       // create the remote app dir for app but for a different user testUser
       Path path = new Path(remoteLogRootDir + testUser +
@@ -1547,7 +1578,8 @@ public class TestLogsCLI {
     logTypes.add("syslog");
     // create container logs in localLogDir
     for (ContainerId containerId : containerIds) {
-      createContainerLogInLocalDir(appLogsDir, containerId, fs, logTypes);
+      createContainerLogInLocalDir(appLogsDir, containerId, fs, logTypes,
+          Collections.emptyList());
     }
     Path path =
         new Path(remoteLogRootDir + ugi.getShortUserName()
@@ -1564,7 +1596,8 @@ public class TestLogsCLI {
   }
 
   private static void createContainerLogInLocalDir(Path appLogsDir,
-      ContainerId containerId, FileSystem fs, List<String> logTypes) throws Exception {
+      ContainerId containerId, FileSystem fs, List<String> logTypes,
+      List<String> emptyLogTypes) throws Exception {
     Path containerLogsDir = new Path(appLogsDir, containerId.toString());
     if (fs.exists(containerLogsDir)) {
       fs.delete(containerLogsDir, true);
@@ -1576,6 +1609,12 @@ public class TestLogsCLI {
       writer.write(logMessage(containerId, logType));
       writer.close();
     }
+    for (String emptyLogType : emptyLogTypes) {
+      Writer writer =
+          new FileWriter(new File(containerLogsDir.toString(), emptyLogType));
+      writer.write("");
+      writer.close();
+    }
   }
 
   private static String logMessage(ContainerId containerId, String logType) {
@@ -1584,6 +1623,10 @@ public class TestLogsCLI {
     return sb.toString();
   }
 
+  private static String createEmptyLog(String logType) {
+    return "LogContents:\n\nEnd of LogType:" + logType;
+  }
+
   private static void uploadContainerLogIntoRemoteDir(UserGroupInformation ugi,
       Configuration configuration, List<String> rootLogDirs, NodeId nodeId,
       ContainerId containerId, Path appDir, FileSystem fs) throws Exception {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/logaggregation/LogToolUtils.java

@@ -43,6 +43,26 @@ public final class LogToolUtils {
   public static final String CONTAINER_ON_NODE_PATTERN =
       "Container: %s on %s";
 
+  /**
+   * Formats the header of an aggregated log file.
+   */
+  private static byte[] formatContainerLogHeader(String containerId,
+      String nodeId, ContainerLogAggregationType logType, String fileName,
+      String lastModifiedTime, long fileLength) {
+    StringBuilder sb = new StringBuilder();
+    String containerStr = String.format(
+        LogToolUtils.CONTAINER_ON_NODE_PATTERN,
+        containerId, nodeId);
+    sb.append(containerStr + "\n")
+        .append("LogAggregationType: " + logType + "\n")
+        .append(StringUtils.repeat("=", containerStr.length()) + "\n")
+        .append("LogType:" + fileName + "\n")
+        .append("LogLastModifiedTime:" + lastModifiedTime + "\n")
+        .append("LogLength:" + fileLength + "\n")
+        .append("LogContents:\n");
+    return sb.toString().getBytes(Charset.forName("UTF-8"));
+  }
+
   /**
    * Output container log.
    * @param containerId the containerId
@@ -84,22 +104,10 @@ public final class LogToolUtils {
         : (int) pendingRead;
     int len = fis.read(buf, 0, toRead);
     boolean keepGoing = (len != -1 && curRead < totalBytesToRead);
-    if (keepGoing) {
-      StringBuilder sb = new StringBuilder();
-      String containerStr = String.format(
-          LogToolUtils.CONTAINER_ON_NODE_PATTERN,
-          containerId, nodeId);
-      sb.append(containerStr + "\n")
-          .append("LogAggregationType: " + logType + "\n")
-          .append(StringUtils.repeat("=", containerStr.length()) + "\n")
-          .append("LogType:" + fileName + "\n")
-          .append("LogLastModifiedTime:" + lastModifiedTime + "\n")
-          .append("LogLength:" + Long.toString(fileLength) + "\n")
-          .append("LogContents:\n");
-      byte[] b = sb.toString().getBytes(
-          Charset.forName("UTF-8"));
-      os.write(b, 0, b.length);
-    }
+
+    byte[] b = formatContainerLogHeader(containerId, nodeId, logType, fileName,
+        lastModifiedTime, fileLength);
+    os.write(b, 0, b.length);
     while (keepGoing) {
       os.write(buf, 0, len);
       curRead += len;
@@ -132,22 +140,12 @@ public final class LogToolUtils {
       }
     }
 
+    // output log summary
+    byte[] b = formatContainerLogHeader(containerId, nodeId, logType, fileName,
+        lastModifiedTime, fileLength);
+    os.write(b, 0, b.length);
+
     if (totalBytesToRead > 0) {
-      // output log summary
-      StringBuilder sb = new StringBuilder();
-      String containerStr = String.format(
-          LogToolUtils.CONTAINER_ON_NODE_PATTERN,
-          containerId, nodeId);
-      sb.append(containerStr + "\n")
-          .append("LogAggregationType: " + logType + "\n")
-          .append(StringUtils.repeat("=", containerStr.length()) + "\n")
-          .append("LogType:" + fileName + "\n")
-          .append("LogLastModifiedTime:" + lastModifiedTime + "\n")
-          .append("LogLength:" + Long.toString(fileLength) + "\n")
-          .append("LogContents:\n");
-      byte[] b = sb.toString().getBytes(
-          Charset.forName("UTF-8"));
-      os.write(b, 0, b.length);
       // output log content
       FileChannel inputChannel = fis.getChannel();
       WritableByteChannel outputChannel = Channels.newChannel(os);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/logaggregation/TestAggregatedLogFormat.java

@@ -67,7 +67,6 @@ public class TestAggregatedLogFormat {
 
   private static final File testWorkDir = new File("target",
       "TestAggregatedLogFormat");
-  private static final Configuration conf = new Configuration();
   private static final FileSystem fs;
   private static final char filler = 'x';
   private static final Logger LOG = LoggerFactory
@@ -75,7 +74,7 @@ public class TestAggregatedLogFormat {
 
   static {
     try {
-      fs = FileSystem.get(conf);
+      fs = FileSystem.get(new Configuration());
     } catch (IOException e) {
       throw new RuntimeException(e);
     }
@@ -282,6 +281,45 @@ public class TestAggregatedLogFormat {
     Assert.assertEquals(expectedLength, s.length());
   }
 
+  @Test
+  public void testZeroLengthLog() throws IOException {
+    Configuration conf = new Configuration();
+    File workDir = new File(testWorkDir, "testZeroLength");
+    Path remoteAppLogFile = new Path(workDir.getAbsolutePath(),
+        "aggregatedLogFile");
+    Path srcFileRoot = new Path(workDir.getAbsolutePath(), "srcFiles");
+    ContainerId testContainerId = TestContainerId.newContainerId(1, 1, 1, 1);
+    Path t = new Path(srcFileRoot, testContainerId.getApplicationAttemptId()
+        .getApplicationId().toString());
+    Path srcFilePath = new Path(t, testContainerId.toString());
+
+    // Create zero byte file
+    writeSrcFile(srcFilePath, "stdout", 0);
+
+    UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
+    try (LogWriter logWriter = new LogWriter()) {
+      logWriter.initialize(conf, remoteAppLogFile, ugi);
+
+      LogKey logKey = new LogKey(testContainerId);
+      LogValue logValue =
+          new LogValue(Collections.singletonList(srcFileRoot.toString()),
+              testContainerId, ugi.getShortUserName());
+
+      logWriter.append(logKey, logValue);
+    }
+
+    LogReader logReader = new LogReader(conf, remoteAppLogFile);
+    LogKey rLogKey = new LogKey();
+    DataInputStream dis = logReader.next(rLogKey);
+    Writer writer = new StringWriter();
+    LogReader.readAcontainerLogs(dis, writer);
+
+    Assert.assertEquals("LogType:stdout\n" +
+        "LogLength:0\n" +
+        "Log Contents:\n\n" +
+        "End of LogType:stdout\n\n", writer.toString());
+  }
+
   @Test(timeout=10000)
   public void testContainerLogsFileAccess() throws IOException {
     // This test will run only if NativeIO is enabled as SecureIOUtils 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/logaggregation/filecontroller/ifile/TestLogAggregationIndexedFileController.java

@@ -85,6 +85,7 @@ public class TestLogAggregationIndexedFileController
       .createImmutable((short) (0777));
   private static final UserGroupInformation USER_UGI = UserGroupInformation
       .createRemoteUser("testUser");
+  private static final String ZERO_FILE = "zero";
   private FileSystem fs;
   private ApplicationId appId;
   private ContainerId containerId;
@@ -153,6 +154,8 @@ public class TestLogAggregationIndexedFileController
           logType);
       files.add(file);
     }
+    files.add(createZeroLocalLogFile(appLogsDir));
+
     LogValue value = mock(LogValue.class);
     when(value.getPendingLogFilesToUploadForThisContainer()).thenReturn(files);
 
@@ -212,12 +215,13 @@ public class TestLogAggregationIndexedFileController
     for (ContainerLogMeta log : meta) {
       assertEquals(containerId.toString(), log.getContainerId());
       assertEquals(nodeId.toString(), log.getNodeId());
-      assertEquals(3, log.getContainerLogMeta().size());
+      assertEquals(4, log.getContainerLogMeta().size());
       for (ContainerLogFileInfo file : log.getContainerLogMeta()) {
         fileNames.add(file.getFileName());
       }
     }
     fileNames.removeAll(logTypes);
+    fileNames.remove(ZERO_FILE);
     assertTrue(fileNames.isEmpty());
 
     boolean foundLogs = fileFormat.readAggregatedLogs(logRequest, System.out);
@@ -226,6 +230,7 @@ public class TestLogAggregationIndexedFileController
       assertTrue(sysOutStream.toString().contains(logMessage(
           containerId, logType)));
     }
+    assertZeroFileIsContained(sysOutStream.toString());
     sysOutStream.reset();
 
     Configuration factoryConf = new Configuration(getConf());
@@ -297,12 +302,13 @@ public class TestLogAggregationIndexedFileController
     for (ContainerLogMeta log : meta) {
       assertEquals(containerId.toString(), log.getContainerId());
       assertEquals(nodeId.toString(), log.getNodeId());
-      assertEquals(3, log.getContainerLogMeta().size());
+      assertEquals(4, log.getContainerLogMeta().size());
       for (ContainerLogFileInfo file : log.getContainerLogMeta()) {
         fileNames.add(file.getFileName());
       }
     }
     fileNames.removeAll(logTypes);
+    fileNames.remove(ZERO_FILE);
     assertTrue(fileNames.isEmpty());
     foundLogs = fileFormat.readAggregatedLogs(logRequest, System.out);
     assertTrue(foundLogs);
@@ -333,6 +339,7 @@ public class TestLogAggregationIndexedFileController
       }
     }
     fileNames.removeAll(newLogTypes);
+    fileNames.remove(ZERO_FILE);
     assertTrue(fileNames.isEmpty());
     foundLogs = fileFormat.readAggregatedLogs(logRequest, System.out);
     assertTrue(foundLogs);
@@ -361,6 +368,7 @@ public class TestLogAggregationIndexedFileController
       }
     }
     fileNames.removeAll(newLogTypes);
+    fileNames.remove(ZERO_FILE);
     assertTrue(fileNames.isEmpty());
     foundLogs = fileFormat.readAggregatedLogs(logRequest, System.out);
     assertTrue(foundLogs);
@@ -423,8 +431,25 @@ public class TestLogAggregationIndexedFileController
     sysOutStream.reset();
   }
 
+  private void assertZeroFileIsContained(String outStream) {
+    assertTrue(outStream.contains(
+        "LogContents:\n" +
+        "\n" +
+        "End of LogType:zero"));
+  }
+
+  private File createZeroLocalLogFile(Path localLogDir) throws IOException {
+    return createAndWriteLocalLogFile(localLogDir, ZERO_FILE, "");
+  }
+
   private File createAndWriteLocalLogFile(ContainerId containerId,
       Path localLogDir, String logType) throws IOException {
+    return createAndWriteLocalLogFile(localLogDir, logType,
+        logMessage(containerId, logType));
+  }
+
+  private File createAndWriteLocalLogFile(Path localLogDir, String logType,
+      String message) throws IOException {
     File file = new File(localLogDir.toString(), logType);
     if (file.exists()) {
       file.delete();
@@ -433,7 +458,7 @@ public class TestLogAggregationIndexedFileController
     Writer writer = null;
     try {
       writer = new FileWriter(file);
-      writer.write(logMessage(containerId, logType));
+      writer.write(message);
       writer.close();
       return file;
     } finally {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/logaggregation/TestLogAggregationService.java

@@ -153,6 +153,7 @@ import org.slf4j.LoggerFactory;
 public class TestLogAggregationService extends BaseContainerManagerTest {
 
   private Map<ApplicationAccessType, String> acls = createAppAcls();
+  private static final String[] EMPTY_FILES = new String[] {"zero"};
   
   static {
     LOG = LoggerFactory.getLogger(TestLogAggregationService.class);
@@ -219,7 +220,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     ContainerId container11 = ContainerId.newContainerId(appAttemptId, 1);
     // Simulate log-file creation
     writeContainerLogs(app1LogDir, container11, new String[] { "stdout",
-        "stderr", "syslog" });
+        "stderr", "syslog" }, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container11,
             ContainerType.APPLICATION_MASTER, 0));
@@ -342,7 +343,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
         BuilderUtils.newApplicationAttemptId(app, 1);
     ContainerId cont = ContainerId.newContainerId(appAttemptId, 1);
     writeContainerLogs(appLogDir, cont, new String[] { "stdout",
-        "stderr", "syslog" });
+        "stderr", "syslog" }, EMPTY_FILES);
     logAggregationService.handle(new LogHandlerContainerFinishedEvent(cont,
         ContainerType.APPLICATION_MASTER, 0));
     logAggregationService.handle(new LogHandlerAppFinishedEvent(app));
@@ -432,7 +433,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     ContainerId container11 = ContainerId.newContainerId(appAttemptId1, 1);
 
     // Simulate log-file creation
-    writeContainerLogs(app1LogDir, container11, fileNames);
+    writeContainerLogs(app1LogDir, container11, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container11,
             ContainerType.APPLICATION_MASTER, 0));
@@ -454,14 +455,14 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     ContainerId container21 = ContainerId.newContainerId(appAttemptId2, 1);
 
-    writeContainerLogs(app2LogDir, container21, fileNames);
+    writeContainerLogs(app2LogDir, container21, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container21,
             ContainerType.APPLICATION_MASTER, 0));
 
     ContainerId container12 = ContainerId.newContainerId(appAttemptId1, 2);
 
-    writeContainerLogs(app1LogDir, container12, fileNames);
+    writeContainerLogs(app1LogDir, container12, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container12,
             ContainerType.TASK, 0));
@@ -497,25 +498,25 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     reset(appEventHandler);
     
     ContainerId container31 = ContainerId.newContainerId(appAttemptId3, 1);
-    writeContainerLogs(app3LogDir, container31, fileNames);
+    writeContainerLogs(app3LogDir, container31, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container31,
             ContainerType.APPLICATION_MASTER, 0));
 
     ContainerId container32 = ContainerId.newContainerId(appAttemptId3, 2);
-    writeContainerLogs(app3LogDir, container32, fileNames);
+    writeContainerLogs(app3LogDir, container32, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container32,
             ContainerType.TASK, 1)); // Failed
 
     ContainerId container22 = ContainerId.newContainerId(appAttemptId2, 2);
-    writeContainerLogs(app2LogDir, container22, fileNames);
+    writeContainerLogs(app2LogDir, container22, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container22,
             ContainerType.TASK, 0));
 
     ContainerId container33 = ContainerId.newContainerId(appAttemptId3, 3);
-    writeContainerLogs(app3LogDir, container33, fileNames);
+    writeContainerLogs(app3LogDir, container33, fileNames, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container33,
             ContainerType.TASK, 0));
@@ -531,13 +532,15 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     assertEquals(0, logAggregationService.getNumAggregators());
 
     verifyContainerLogs(logAggregationService, application1,
-        new ContainerId[] { container11, container12 }, fileNames, 3, false);
+        new ContainerId[] {container11, container12}, fileNames, 4, false,
+        EMPTY_FILES);
 
     verifyContainerLogs(logAggregationService, application2,
-        new ContainerId[] { container21 }, fileNames, 3, false);
+        new ContainerId[] {container21}, fileNames, 4, false, EMPTY_FILES);
 
     verifyContainerLogs(logAggregationService, application3,
-        new ContainerId[] { container31, container32 }, fileNames, 3, false);
+        new ContainerId[] {container31, container32}, fileNames, 4, false,
+        EMPTY_FILES);
     
     dispatcher.await();
     
@@ -935,7 +938,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
   }
 
   private void writeContainerLogs(File appLogDir, ContainerId containerId,
-      String[] fileName) throws IOException {
+      String[] fileName, String[] emptyFiles) throws IOException {
     // ContainerLogDir should be created
     String containerStr = containerId.toString();
     File containerLogDir = new File(appLogDir, containerStr);
@@ -947,17 +950,22 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
       writer11.write(containerStr + " Hello " + fileType + "!");
       writer11.close();
     }
+    for (String emptyFile : emptyFiles) {
+      Writer writer11 = new FileWriter(new File(containerLogDir, emptyFile));
+      writer11.write("");
+      writer11.close();
+    }
   }
 
   private LogFileStatusInLastCycle verifyContainerLogs(
       LogAggregationService logAggregationService,
       ApplicationId appId, ContainerId[] expectedContainerIds,
       String[] logFiles, int numOfLogsPerContainer,
-      boolean multiLogs) throws IOException {
+      boolean multiLogs, String[] zeroLengthFiles) throws IOException {
     return verifyContainerLogs(logAggregationService, appId,
         expectedContainerIds, expectedContainerIds.length,
         expectedContainerIds.length, logFiles, numOfLogsPerContainer,
-        multiLogs);
+        multiLogs, zeroLengthFiles);
   }
 
   // expectedContainerIds is the minimal set of containers to check.
@@ -968,7 +976,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
       LogAggregationService logAggregationService,
       ApplicationId appId, ContainerId[] expectedContainerIds,
       int minNumOfContainers, int maxNumOfContainers,
-      String[] logFiles, int numOfLogsPerContainer, boolean multiLogs)
+      String[] logFiles, int numOfLogsPerContainer, boolean multiLogs,
+      String[] zeroLengthLogFiles)
     throws IOException {
     Path appLogDir = logAggregationService.getLogAggregationFileController(
         conf).getRemoteAppLogDir(appId, this.user);
@@ -1089,6 +1098,11 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
               + " not present in aggregated log-file!", foundValue);
           Assert.assertEquals(expectedValue, foundValue);
         }
+        for (String emptyFile : zeroLengthLogFiles) {
+          String foundValue = thisContainerMap.remove(emptyFile);
+          String expectedValue = "\nEnd of LogType:" + emptyFile;
+          Assert.assertEquals(expectedValue, foundValue);
+        }
         Assert.assertEquals(0, thisContainerMap.size());
       }
       Assert.assertTrue("number of remaining containers should be at least " +
@@ -1584,7 +1598,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     // Simulate log-file creation
     writeContainerLogs(appLogDir1, container1, new String[] { "stdout",
-        "stderr", "syslog" });
+        "stderr", "syslog" }, EMPTY_FILES);
     logAggregationService.handle(new LogHandlerContainerFinishedEvent(
         container1, ContainerType.APPLICATION_MASTER, 0));
 
@@ -1605,7 +1619,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     ContainerId container2 = ContainerId.newContainerId(appAttemptId2, 1);
 
     writeContainerLogs(app2LogDir, container2, new String[] { "stdout",
-        "stderr", "syslog" });
+        "stderr", "syslog" }, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container2,
             ContainerType.APPLICATION_MASTER, 0));
@@ -1629,7 +1643,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
       this.user, null, this.acls, context1));
     ContainerId container3 = ContainerId.newContainerId(appAttemptId3, 1);
     writeContainerLogs(app3LogDir, container3, new String[] { "stdout",
-        "sys.log", "std.log", "out.log", "err.log", "log" });
+        "sys.log", "std.log", "out.log", "err.log", "log" }, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container3,
             ContainerType.APPLICATION_MASTER, 0));
@@ -1654,7 +1668,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
       this.user, null, this.acls, context2));
     ContainerId container4 = ContainerId.newContainerId(appAttemptId4, 1);
     writeContainerLogs(app4LogDir, container4, new String[] { "stdout",
-        "sys.log", "std.log", "out.log", "err.log", "log" });
+        "sys.log", "std.log", "out.log", "err.log", "log" }, EMPTY_FILES);
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container4,
             ContainerType.APPLICATION_MASTER, 0));
@@ -1682,19 +1696,19 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     String[] logFiles = new String[] { "stdout", "syslog" };
     verifyContainerLogs(logAggregationService, application1,
-      new ContainerId[] { container1 }, logFiles, 2, false);
+        new ContainerId[] {container1}, logFiles, 2, false, new String[] {});
 
     logFiles = new String[] { "stderr" };
     verifyContainerLogs(logAggregationService, application2,
-      new ContainerId[] { container2 }, logFiles, 1, false);
+        new ContainerId[] {container2}, logFiles, 2, false, EMPTY_FILES);
 
     logFiles = new String[] { "out.log", "err.log" };
     verifyContainerLogs(logAggregationService, application3,
-      new ContainerId[] { container3 }, logFiles, 2, false);
+        new ContainerId[] {container3}, logFiles, 2, false, new String[] {});
 
     logFiles = new String[] { "sys.log" };
     verifyContainerLogs(logAggregationService, application4,
-      new ContainerId[] { container4 }, logFiles, 1, false);
+        new ContainerId[] {container4}, logFiles, 1, false, new String[] {});
 
     dispatcher.await();
 
@@ -1721,8 +1735,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     // When the app is running, we only aggregate the log with
     // the name stdout. After the app finishes, we only aggregate
     // the log with the name std_final.
-    logAggregationContext.setRolledLogsIncludePattern("stdout");
-    logAggregationContext.setIncludePattern("std_final");
+    logAggregationContext.setRolledLogsIncludePattern("stdout|zero");
+    logAggregationContext.setIncludePattern("std_final|empty_final");
     this.conf.set(
         YarnConfiguration.NM_LOG_DIRS, localLogDir.getAbsolutePath());
     //configure YarnConfiguration.NM_REMOTE_APP_LOG_DIR to
@@ -1767,7 +1781,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     // until the app finishes.
     String[] logFilesWithFinalLog =
         new String[] {"stdout", "std_final"};
-    writeContainerLogs(appLogDir, container, logFilesWithFinalLog);
+    String[] zeroFiles = new String[] {"zero", "empty_final"};
+    writeContainerLogs(appLogDir, container, logFilesWithFinalLog, zeroFiles);
 
     // Do log aggregation
     AppLogAggregatorImpl aggregator =
@@ -1781,7 +1796,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     String[] logFiles = new String[] { "stdout" };
     verifyContainerLogs(logAggregationService, application,
-        new ContainerId[] {container}, logFiles, 1, true);
+        new ContainerId[] {container}, logFiles, 2, true, EMPTY_FILES);
 
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container,
@@ -1800,8 +1815,9 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     // This container finishes.
     // The log "std_final" should be aggregated this time.
     String[] logFinalLog = new String[] {"std_final"};
+    String[] emptyFinalLog = new String[] {"empty_final"};
     verifyContainerLogs(logAggregationService, application,
-        new ContainerId[] {container}, logFinalLog, 1, true);
+        new ContainerId[] {container}, logFinalLog, 2, true, emptyFinalLog);
 
     logAggregationService.handle(new LogHandlerAppFinishedEvent(application));
 
@@ -1823,7 +1839,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     finishApplication(appId, logAggregationService);
 
     verifyContainerLogs(logAggregationService, appId,
-        new ContainerId[] {container1}, logFiles, 0, false);
+        new ContainerId[] {container1}, logFiles, 0, false, EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -1847,7 +1863,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     finishApplication(appId, logAggregationService);
 
     verifyContainerLogs(logAggregationService, appId,
-        new ContainerId[] { container1 }, logFiles, 1, false);
+        new ContainerId[] {container1}, logFiles, 2, false, EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -1871,7 +1887,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     finishApplication(appId, logAggregationService);
 
     verifyContainerLogs(logAggregationService, appId,
-        new ContainerId[] { container1, container2 }, logFiles, 1, false);
+        new ContainerId[] {container1, container2}, logFiles, 2, false,
+        EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -1895,7 +1912,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     finishApplication(appId, logAggregationService);
 
     verifyContainerLogs(logAggregationService, appId,
-        new ContainerId[] { container2, container3 }, logFiles, 1, false);
+        new ContainerId[] {container2, container3}, logFiles, 2, false,
+        EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -1931,7 +1949,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     finishApplication(appId, logAggregationService);
 
     verifyContainerLogs(logAggregationService, appId,
-        new ContainerId[] { container1 }, logFiles, 1, false);
+        new ContainerId[] {container1}, logFiles, 2, false, EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -2080,7 +2098,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     verifyContainerLogs(logAggregationService, appId,
         new ContainerId[] { container1, container2, container3 },
-            logFiles, 1, false);
+            logFiles, 2, false, EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -2162,7 +2180,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     verifyContainerLogs(logAggregationService, appId,
         containerIds.toArray(new ContainerId[containerIds.size()]),
         minOfContainersWithLogs, maxOfContainersWithLogs,
-        logFiles, 1, false);
+        logFiles, 2, false, EMPTY_FILES);
 
     verifyLogAggFinishEvent(appId);
   }
@@ -2240,7 +2258,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     File appLogDir1 =
         new File(localLogDir, application1.toString());
     appLogDir1.mkdir();
-    writeContainerLogs(appLogDir1, containerId, logFiles);
+    writeContainerLogs(appLogDir1, containerId, logFiles, EMPTY_FILES);
 
     logAggregationService.handle(new LogHandlerContainerFinishedEvent(
         containerId, containerType, exitCode));
@@ -2361,7 +2379,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     String[] logFiles1WithFinalLog =
         new String[] { "stdout", "stderr", "syslog", "std_final" };
     String[] logFiles1 = new String[] { "stdout", "stderr", "syslog"};
-    writeContainerLogs(appLogDir, container, logFiles1WithFinalLog);
+    writeContainerLogs(appLogDir, container, logFiles1WithFinalLog,
+        EMPTY_FILES);
 
     // Do log aggregation
     AppLogAggregatorImpl aggregator =
@@ -2378,7 +2397,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     }
     // Container logs should be uploaded
     logFileStatusInLastCycle = verifyContainerLogs(logAggregationService, application,
-        new ContainerId[] { container }, logFiles1, 3, true);
+        new ContainerId[] {container}, logFiles1, 4, true, EMPTY_FILES);
     for(String logFile : logFiles1) {
       Assert.assertTrue(logFileStatusInLastCycle.getLogFileTypesInLastCycle()
         .contains(logFile));
@@ -2403,7 +2422,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     // Do log aggregation
     String[] logFiles2 = new String[] { "stdout_1", "stderr_1", "syslog_1" };
-    writeContainerLogs(appLogDir, container, logFiles2);
+    writeContainerLogs(appLogDir, container, logFiles2, EMPTY_FILES);
 
     aggregator.doLogAggregationOutOfBand();
 
@@ -2416,7 +2435,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     }
     // Container logs should be uploaded
     logFileStatusInLastCycle = verifyContainerLogs(logAggregationService, application,
-        new ContainerId[] { container }, logFiles2, 3, true);
+        new ContainerId[] {container}, logFiles2, 4, true, EMPTY_FILES);
 
     for(String logFile : logFiles2) {
       Assert.assertTrue(logFileStatusInLastCycle.getLogFileTypesInLastCycle()
@@ -2430,7 +2449,7 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
 
     // create another logs
     String[] logFiles3 = new String[] { "stdout_2", "stderr_2", "syslog_2" };
-    writeContainerLogs(appLogDir, container, logFiles3);
+    writeContainerLogs(appLogDir, container, logFiles3, EMPTY_FILES);
 
     logAggregationService.handle(
         new LogHandlerContainerFinishedEvent(container,
@@ -2450,7 +2469,8 @@ public class TestLogAggregationService extends BaseContainerManagerTest {
     String[] logFiles3WithFinalLog =
         new String[] { "stdout_2", "stderr_2", "syslog_2", "std_final" };
     verifyContainerLogs(logAggregationService, application,
-      new ContainerId[] { container }, logFiles3WithFinalLog, 4, true);
+        new ContainerId[] {container}, logFiles3WithFinalLog, 5, true,
+        EMPTY_FILES);
     logAggregationService.stop();
     assertEquals(0, logAggregationService.getNumAggregators());
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/TestNMWebServices.java

@@ -28,6 +28,7 @@ import com.sun.jersey.api.client.UniformInterfaceException;
 import com.sun.jersey.api.client.WebResource;
 import com.sun.jersey.guice.spi.container.servlet.GuiceContainer;
 import com.sun.jersey.test.framework.WebAppDescriptor;
+import org.apache.commons.io.FileUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FileUtil;
@@ -118,6 +119,7 @@ public class TestNMWebServices extends JerseyTestBase {
   private static LocalDirsHandlerService dirsHandler;
   private static WebApp nmWebApp;
   private static final String LOGSERVICEWSADDR = "test:1234";
+  private static final String LOG_MESSAGE = "log message\n";
 
   private static final File testRootDir = new File("target",
       TestNMWebServices.class.getSimpleName());
@@ -441,20 +443,26 @@ public class TestNMWebServices extends JerseyTestBase {
 
   @Test (timeout = 5000)
   public void testContainerLogsWithNewAPI() throws Exception {
-    final ContainerId containerId = BuilderUtils.newContainerId(0, 0, 0, 0);
-    WebResource r = resource();
-    r = r.path("ws").path("v1").path("node").path("containers")
-        .path(containerId.toString()).path("logs");
-    testContainerLogs(r, containerId);
+    ContainerId containerId0 = BuilderUtils.newContainerId(0, 0, 0, 0);
+    WebResource r0 = resource();
+    r0 = r0.path("ws").path("v1").path("node").path("containers")
+        .path(containerId0.toString()).path("logs");
+    testContainerLogs(r0, containerId0, LOG_MESSAGE);
+
+    ContainerId containerId1 = BuilderUtils.newContainerId(0, 0, 0, 1);
+    WebResource r1 = resource();
+    r1 = r1.path("ws").path("v1").path("node").path("containers")
+            .path(containerId1.toString()).path("logs");
+    testContainerLogs(r1, containerId1, "");
   }
 
   @Test (timeout = 5000)
   public void testContainerLogsWithOldAPI() throws Exception {
-    final ContainerId containerId = BuilderUtils.newContainerId(1, 1, 0, 1);
+    final ContainerId containerId2 = BuilderUtils.newContainerId(1, 1, 0, 2);
     WebResource r = resource();
     r = r.path("ws").path("v1").path("node").path("containerlogs")
-        .path(containerId.toString());
-    testContainerLogs(r, containerId);
+        .path(containerId2.toString());
+    testContainerLogs(r, containerId2, LOG_MESSAGE);
   }
 
   @Test (timeout = 10000)
@@ -583,15 +591,14 @@ public class TestNMWebServices extends JerseyTestBase {
         2, json.getJSONArray("assignedGpuDevices").length());
   }
 
-  private void testContainerLogs(WebResource r, ContainerId containerId)
-      throws Exception {
+  private void testContainerLogs(WebResource r, ContainerId containerId,
+      String logMessage) throws Exception {
     final String containerIdStr = containerId.toString();
     final ApplicationAttemptId appAttemptId = containerId
         .getApplicationAttemptId();
     final ApplicationId appId = appAttemptId.getApplicationId();
     final String appIdStr = appId.toString();
     final String filename = "logfile1";
-    final String logMessage = "log message\n";
     nmContext.getApplications().put(appId, new ApplicationImpl(null, "user",
         appId, null, nmContext));
     
@@ -607,6 +614,9 @@ public class TestNMWebServices extends JerseyTestBase {
     
     File logFile = new File(path.toUri().getPath());
     logFile.deleteOnExit();
+    if (logFile.getParentFile().exists()) {
+      FileUtils.deleteDirectory(logFile.getParentFile());
+    }
     assertTrue("Failed to create log dir", logFile.getParentFile().mkdirs());
     PrintWriter pw = new PrintWriter(logFile);
     pw.print(logMessage);
@@ -628,8 +638,10 @@ public class TestNMWebServices extends JerseyTestBase {
         .accept(MediaType.TEXT_PLAIN).get(ClientResponse.class);
     responseText = response.getEntity(String.class);
     responseLogMessage = getLogContext(responseText);
-    assertEquals(5, responseLogMessage.getBytes().length);
-    assertEquals(new String(logMessage.getBytes(), 0, 5), responseLogMessage);
+    int truncatedLength = Math.min(5, logMessage.getBytes().length);
+    assertEquals(truncatedLength, responseLogMessage.getBytes().length);
+    assertEquals(new String(logMessage.getBytes(), 0, truncatedLength),
+        responseLogMessage);
     assertTrue(fullTextSize >= responseLogMessage.getBytes().length);
 
     // specify the bytes which is larger than the actual file size,
@@ -649,9 +661,10 @@ public class TestNMWebServices extends JerseyTestBase {
         .accept(MediaType.TEXT_PLAIN).get(ClientResponse.class);
     responseText = response.getEntity(String.class);
     responseLogMessage = getLogContext(responseText);
-    assertEquals(5, responseLogMessage.getBytes().length);
+    assertEquals(truncatedLength, responseLogMessage.getBytes().length);
     assertEquals(new String(logMessage.getBytes(),
-        logMessage.getBytes().length - 5, 5), responseLogMessage);
+        logMessage.getBytes().length - truncatedLength, truncatedLength),
+        responseLogMessage);
     assertTrue(fullTextSize >= responseLogMessage.getBytes().length);
 
     response = r.path(filename)