YARN-7973. Added ContainerRelaunch feature for Docker containers.

Contributed by Shane Kumpf

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java

@@ -98,6 +98,16 @@ public interface ApplicationConstants {
 
   public static final String STDOUT = "stdout";
 
+  /**
+   * The type of launch for the container.
+   */
+  @Public
+  @Unstable
+  enum ContainerLaunchType {
+    LAUNCH,
+    RELAUNCH
+  }
+
   /**
    * Environment for Applications.
    *

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/ContainerExecutor.java

@@ -181,6 +181,17 @@ public abstract class ContainerExecutor implements Configurable {
   public abstract int launchContainer(ContainerStartContext ctx) throws
       IOException, ConfigurationException;
 
+  /**
+   * Relaunch the container on the node. This is a blocking call and returns
+   * only when the container exits.
+   * @param ctx Encapsulates information necessary for relaunching containers.
+   * @return the return status of the relaunch
+   * @throws IOException if the container relaunch fails
+   * @throws ConfigurationException if config error was found
+   */
+  public abstract int relaunchContainer(ContainerStartContext ctx) throws
+      IOException, ConfigurationException;
+
   /**
    * Signal container with the specified signal.
    *

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DefaultContainerExecutor.java

@@ -339,6 +339,12 @@ public class DefaultContainerExecutor extends ContainerExecutor {
     return 0;
   }
 
+  @Override
+  public int relaunchContainer(ContainerStartContext ctx)
+      throws IOException, ConfigurationException {
+    return launchContainer(ctx);
+  }
+
   /**
    * Create a new {@link ShellCommandExecutor} using the parameters.
    *

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LinuxContainerExecutor.java

@@ -476,6 +476,20 @@ public class LinuxContainerExecutor extends ContainerExecutor {
   @Override
   public int launchContainer(ContainerStartContext ctx)
       throws IOException, ConfigurationException {
+    return handleLaunchForLaunchType(ctx,
+        ApplicationConstants.ContainerLaunchType.LAUNCH);
+  }
+
+  @Override
+  public int relaunchContainer(ContainerStartContext ctx)
+      throws IOException, ConfigurationException {
+    return handleLaunchForLaunchType(ctx,
+        ApplicationConstants.ContainerLaunchType.RELAUNCH);
+  }
+
+  private int handleLaunchForLaunchType(ContainerStartContext ctx,
+      ApplicationConstants.ContainerLaunchType type) throws IOException,
+      ConfigurationException {
     Container container = ctx.getContainer();
     String user = ctx.getUser();
 
@@ -544,13 +558,37 @@ public class LinuxContainerExecutor extends ContainerExecutor {
         ContainerRuntimeContext runtimeContext = buildContainerRuntimeContext(
             ctx, pidFilePath, resourcesOptions, tcCommandFile, numaArgs);
 
+        if (type.equals(ApplicationConstants.ContainerLaunchType.RELAUNCH)) {
+          linuxContainerRuntime.relaunchContainer(runtimeContext);
+        } else {
           linuxContainerRuntime.launchContainer(runtimeContext);
+        }
+
       } else {
         LOG.info(
             "Container was marked as inactive. Returning terminated error");
         return ContainerExecutor.ExitCode.TERMINATED.getExitCode();
       }
     } catch (ContainerExecutionException e) {
+      return handleExitCode(e, container, containerId);
+    } finally {
+      resourcesHandler.postExecute(containerId);
+
+      try {
+        if (resourceHandlerChain != null) {
+          resourceHandlerChain.postComplete(containerId);
+        }
+      } catch (ResourceHandlerException e) {
+        LOG.warn("ResourceHandlerChain.postComplete failed for " +
+            "containerId: " + containerId + ". Exception: " + e);
+      }
+    }
+
+    return 0;
+  }
+
+  private int handleExitCode(ContainerExecutionException e, Container container,
+      ContainerId containerId) throws ConfigurationException {
     int exitCode = e.getExitCode();
     LOG.warn("Exit code from container " + containerId + " is : " + exitCode);
     // 143 (SIGTERM) and 137 (SIGKILL) exit codes means the container was
@@ -600,20 +638,6 @@ public class LinuxContainerExecutor extends ContainerExecutor {
           "Container killed on request. Exit code is " + exitCode));
     }
     return exitCode;
-    } finally {
-      resourcesHandler.postExecute(containerId);
-
-      try {
-        if (resourceHandlerChain != null) {
-          resourceHandlerChain.postComplete(containerId);
-        }
-      } catch (ResourceHandlerException e) {
-        LOG.warn("ResourceHandlerChain.postComplete failed for " +
-            "containerId: " + containerId + ". Exception: " + e);
-      }
-    }
-
-    return 0;
   }
 
   private ContainerRuntimeContext buildContainerRuntimeContext(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/ContainerLaunch.java

@@ -487,6 +487,24 @@ public class ContainerLaunch implements Callable<Integer> {
   @SuppressWarnings("unchecked")
   protected int launchContainer(ContainerStartContext ctx)
       throws IOException, ConfigurationException {
+    int launchPrep = prepareForLaunch(ctx);
+    if (launchPrep == 0) {
+      return exec.launchContainer(ctx);
+    }
+    return launchPrep;
+  }
+
+  @SuppressWarnings("unchecked")
+  protected int relaunchContainer(ContainerStartContext ctx)
+      throws IOException, ConfigurationException {
+    int launchPrep = prepareForLaunch(ctx);
+    if (launchPrep == 0) {
+      return exec.relaunchContainer(ctx);
+    }
+    return launchPrep;
+  }
+
+  protected int prepareForLaunch(ContainerStartContext ctx) throws IOException {
     ContainerId containerId = container.getContainerId();
     if (container.isMarkedForKilling()) {
       LOG.info("Container " + containerId + " not launched as it has already "
@@ -508,8 +526,8 @@ public class ContainerLaunch implements Callable<Integer> {
       return ExitCode.TERMINATED.getExitCode();
     } else {
       exec.activateContainer(containerId, pidFilePath);
-      return exec.launchContainer(ctx);
     }
+    return ExitCode.SUCCESS.getExitCode();
   }
 
   protected void setContainerCompletedStatus(int exitCode) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/ContainerRelaunch.java

@@ -108,7 +108,7 @@ public class ContainerRelaunch extends ContainerLaunch {
             + dirsHandler.getDisksHealthReport(false));
       }
 
-      ret = launchContainer(new ContainerStartContext.Builder()
+      ret = relaunchContainer(new ContainerStartContext.Builder()
           .setContainer(container)
           .setLocalizedResources(localResources)
           .setNmPrivateContainerScriptPath(nmPrivateContainerScriptPath)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/DefaultLinuxContainerRuntime.java

@@ -125,6 +125,12 @@ public class DefaultLinuxContainerRuntime implements LinuxContainerRuntime {
     }
   }
 
+  @Override
+  public void relaunchContainer(ContainerRuntimeContext ctx)
+      throws ContainerExecutionException {
+    launchContainer(ctx);
+  }
+
   @Override
   public void signalContainer(ContainerRuntimeContext ctx)
       throws ContainerExecutionException {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/DelegatingLinuxContainerRuntime.java

@@ -141,6 +141,15 @@ public class DelegatingLinuxContainerRuntime implements LinuxContainerRuntime {
     runtime.launchContainer(ctx);
   }
 
+  @Override
+  public void relaunchContainer(ContainerRuntimeContext ctx)
+      throws ContainerExecutionException {
+    Container container = ctx.getContainer();
+    LinuxContainerRuntime runtime = pickContainerRuntime(container);
+
+    runtime.relaunchContainer(ctx);
+  }
+
   @Override
   public void signalContainer(ContainerRuntimeContext ctx)
       throws ContainerExecutionException {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/DockerLinuxContainerRuntime.java

@@ -24,9 +24,11 @@ import com.google.common.annotations.VisibleForTesting;
 import org.apache.hadoop.security.Credentials;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.server.nodemanager.Context;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerCommandExecutor;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerKillCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerRmCommand;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerStartCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerVolumeCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.DockerCommandPlugin;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.ResourcePlugin;
@@ -919,6 +921,40 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
     }
   }
 
+  @Override
+  public void relaunchContainer(ContainerRuntimeContext ctx)
+      throws ContainerExecutionException {
+    Container container = ctx.getContainer();
+    String containerIdStr = container.getContainerId().toString();
+    // Check to see if the container already exists for relaunch
+    DockerCommandExecutor.DockerContainerStatus containerStatus =
+        DockerCommandExecutor.getContainerStatus(containerIdStr, conf,
+            privilegedOperationExecutor);
+    if (containerStatus != null &&
+        DockerCommandExecutor.isStartable(containerStatus)) {
+      DockerStartCommand startCommand = new DockerStartCommand(containerIdStr);
+      String commandFile = dockerClient.writeCommandToTempFile(startCommand,
+          containerIdStr);
+      PrivilegedOperation launchOp = buildLaunchOp(ctx, commandFile,
+          startCommand);
+
+      try {
+        privilegedOperationExecutor.executePrivilegedOperation(null,
+            launchOp, null, null, false, false);
+      } catch (PrivilegedOperationException e) {
+        LOG.warn("Relaunch container failed. Exception: ", e);
+        LOG.info("Docker command used: " + startCommand);
+
+        throw new ContainerExecutionException("Launch container failed", e
+            .getExitCode(), e.getOutput(), e.getErrorOutput());
+      }
+    } else {
+      throw new ContainerExecutionException("Container is not in a startable "
+          + "state, unable to relaunch: " + containerIdStr);
+    }
+
+  }
+
   /**
    * Signal the docker container.
    *
@@ -1067,7 +1103,7 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
 
 
   private PrivilegedOperation buildLaunchOp(ContainerRuntimeContext ctx,
-      String commandFile, DockerRunCommand runCommand) {
+      String commandFile, DockerCommand command) {
 
     String runAsUser = ctx.getExecutionAttribute(RUN_AS_USER);
     String containerIdStr = ctx.getContainer().getContainerId().toString();
@@ -1106,7 +1142,7 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
       launchOp.appendArgs(tcCommandFile);
     }
     if (LOG.isDebugEnabled()) {
-      LOG.debug("Launching container with cmd: " + runCommand);
+      LOG.debug("Launching container with cmd: " + command);
     }
 
     return launchOp;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/JavaSandboxLinuxContainerRuntime.java

@@ -268,6 +268,16 @@ public class JavaSandboxLinuxContainerRuntime
     }
   }
 
+  @Override
+  public void relaunchContainer(ContainerRuntimeContext ctx)
+      throws ContainerExecutionException {
+    try {
+      super.relaunchContainer(ctx);
+    } finally {
+      deletePolicyFiles(ctx);
+    }
+  }
+
   /**
    * Determine if JVMSandboxLinuxContainerRuntime should be used.  This is
    * decided based on the value of

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerCommandExecutor.java

@@ -227,4 +227,18 @@ public final class DockerCommandExecutor {
         && !containerStatus.equals(DockerContainerStatus.REMOVING)
         && !containerStatus.equals(DockerContainerStatus.RUNNING);
   }
+
+  /**
+   * Is the container in a startable state?
+   *
+   * @param containerStatus   the container's {@link DockerContainerStatus}.
+   * @return                  is the container in a startable state.
+   */
+  public static boolean isStartable(DockerContainerStatus containerStatus) {
+    if (containerStatus.equals(DockerContainerStatus.EXITED)
+        || containerStatus.equals(DockerContainerStatus.STOPPED)) {
+      return true;
+    }
+    return false;
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerStartCommand.java

@@ -0,0 +1,29 @@
+/*
+ * 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.yarn.server.nodemanager.containermanager.linux.runtime.docker;
+
+/**
+ * Encapsulates the docker start command and its command line arguments.
+ */
+public class DockerStartCommand extends DockerCommand {
+  private static final String START_COMMAND = "start";
+
+  public DockerStartCommand(String containerName) {
+    super(START_COMMAND);
+    super.addCommandArguments("name", containerName);
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/runtime/ContainerRuntime.java

@@ -54,6 +54,16 @@ public interface ContainerRuntime {
   void launchContainer(ContainerRuntimeContext ctx)
       throws ContainerExecutionException;
 
+  /**
+   * Relaunch a container.
+   *
+   * @param ctx the {@link ContainerRuntimeContext}
+   * @throws ContainerExecutionException if an error occurs while relaunching
+   * the container
+   */
+  void relaunchContainer(ContainerRuntimeContext ctx)
+      throws ContainerExecutionException;
+
   /**
    * Signal a container. Signals may be a request to terminate, a status check,
    * etc.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c

@@ -1586,7 +1586,7 @@ int launch_docker_container_as_user(const char * user, const char *app_id,
   fprintf(LOGFILE, "Launching docker container...\n");
   fprintf(LOGFILE, "Docker run command: %s\n", docker_command_with_binary);
   FILE* start_docker = popen(docker_command_with_binary, "r");
-  if (pclose (start_docker) != 0)
+  if (WEXITSTATUS(pclose (start_docker)) != 0)
   {
     fprintf (ERRORFILE,
      "Could not invoke docker %s.\n", docker_command_with_binary);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/utils/docker-util.c

@@ -364,6 +364,8 @@ int get_docker_command(const char *command_file, const struct configuration *con
     return get_docker_stop_command(command_file, conf, out, outlen);
   } else if (strcmp(DOCKER_VOLUME_COMMAND, command) == 0) {
     return get_docker_volume_command(command_file, conf, out, outlen);
+  } else if (strcmp(DOCKER_START_COMMAND, command) == 0) {
+    return get_docker_start_command(command_file, conf, out, outlen);
   } else {
     return UNKNOWN_DOCKER_COMMAND;
   }
@@ -820,6 +822,44 @@ int get_docker_kill_command(const char *command_file, const struct configuration
   return BUFFER_TOO_SMALL;
 }
 
+int get_docker_start_command(const char *command_file, const struct configuration *conf, char *out, const size_t outlen) {
+  int ret = 0;
+  char *container_name = NULL;
+  struct configuration command_config = {0, NULL};
+  ret = read_and_verify_command_file(command_file, DOCKER_START_COMMAND, &command_config);
+  if (ret != 0) {
+    return ret;
+  }
+
+  container_name = get_configuration_value("name", DOCKER_COMMAND_FILE_SECTION, &command_config);
+  if (container_name == NULL || validate_container_name(container_name) != 0) {
+    return INVALID_DOCKER_CONTAINER_NAME;
+  }
+
+  memset(out, 0, outlen);
+
+  ret = add_docker_config_param(&command_config, out, outlen);
+  if (ret != 0) {
+    return BUFFER_TOO_SMALL;
+  }
+
+  ret = add_to_buffer(out, outlen, DOCKER_START_COMMAND);
+  if (ret != 0) {
+    goto free_and_exit;
+  }
+  ret = add_to_buffer(out, outlen, " ");
+  if (ret != 0) {
+    goto free_and_exit;
+  }
+  ret = add_to_buffer(out, outlen, container_name);
+  if (ret != 0) {
+    goto free_and_exit;
+  }
+free_and_exit:
+  free(container_name);
+  return ret;
+}
+
 static int detach_container(const struct configuration *command_config, char *out, const size_t outlen) {
   return add_param_to_command(command_config, "detach", "-d ", 0, out, outlen);
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/utils/docker-util.h

@@ -32,6 +32,7 @@
 #define DOCKER_STOP_COMMAND "stop"
 #define DOCKER_KILL_COMMAND "kill"
 #define DOCKER_VOLUME_COMMAND "volume"
+#define DOCKER_START_COMMAND "start"
 
 
 enum docker_error_codes {
@@ -161,6 +162,16 @@ int get_docker_kill_command(const char* command_file, const struct configuration
 int get_docker_volume_command(const char *command_file, const struct configuration *conf, char *out,
                                const size_t outlen);
 
+/**
+ * Get the Docker start command line string. The function will verify that the params file is meant for the start command.
+ * @param command_file File containing the params for the Docker start command
+ * @param conf Configuration struct containing the container-executor.cfg details
+ * @param out Buffer to fill with the start command
+ * @param outlen Size of the output buffer
+ * @return Return code with 0 indicating success and non-zero codes indicating error
+ */
+int get_docker_start_command(const char* command_file, const struct configuration* conf, char *out, const size_t outlen);
+
 /**
  * Give an error message for the supplied error code
  * @param error_code the error code

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/test/utils/test_docker_util.cc

@@ -338,6 +338,26 @@ namespace ContainerExecutor {
     run_docker_command_test(file_cmd_vec, bad_file_cmd_vec, get_docker_kill_command);
   }
 
+  TEST_F(TestDockerUtil, test_docker_start) {
+    std::vector<std::pair<std::string, std::string> > file_cmd_vec;
+    file_cmd_vec.push_back(std::make_pair<std::string, std::string>(
+         "[docker-command-execution]\n  docker-command=start\n  name=container_e1_12312_11111_02_000001",
+         "start container_e1_12312_11111_02_000001"));
+
+    std::vector<std::pair<std::string, int> > bad_file_cmd_vec;
+    bad_file_cmd_vec.push_back(std::make_pair<std::string, int>(
+        "[docker-command-execution]\n  docker-command=run\n  name=container_e1_12312_11111_02_000001",
+        static_cast<int>(INCORRECT_COMMAND)));
+    bad_file_cmd_vec.push_back(std::make_pair<std::string, int>(
+        "docker-command=start\n  name=ctr-id", static_cast<int>(INCORRECT_COMMAND)));
+    bad_file_cmd_vec.push_back(std::make_pair<std::string, int>(
+        "[docker-command-execution]\n  docker-command=start\n  name=", static_cast<int>(INVALID_DOCKER_CONTAINER_NAME)));
+    bad_file_cmd_vec.push_back(std::make_pair<std::string, int>(
+        "[docker-command-execution]\n  docker-command=start", static_cast<int>(INVALID_DOCKER_CONTAINER_NAME)));
+
+    run_docker_command_test(file_cmd_vec, bad_file_cmd_vec, get_docker_start_command);
+  }
+
   TEST_F(TestDockerUtil, test_detach_container) {
     std::vector<std::pair<std::string, std::string> > file_cmd_vec;
     file_cmd_vec.push_back(std::make_pair<std::string, std::string>(

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

@@ -675,6 +675,18 @@ public class TestLinuxContainerExecutor {
     verify(lce, times(1)).reapContainer(ctx);
   }
 
+  @Test
+  public void testRelaunchContainer() throws Exception {
+    Container container = mock(Container.class);
+    LinuxContainerExecutor lce = mock(LinuxContainerExecutor.class);
+    ContainerStartContext.Builder builder =
+        new ContainerStartContext.Builder();
+    builder.setContainer(container).setUser("foo");
+    ContainerStartContext ctx = builder.build();
+    lce.relaunchContainer(ctx);
+    verify(lce, times(1)).relaunchContainer(ctx);
+  }
+
   private static class TestResourceHandler implements LCEResourcesHandler {
     static Set<ContainerId> postExecContainers = new HashSet<ContainerId>();
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/TestContainerRelaunch.java

@@ -78,7 +78,7 @@ public class TestContainerRelaunch {
     assertEquals("relaunch failed", 0, result);
     ArgumentCaptor<ContainerStartContext> captor =
         ArgumentCaptor.forClass(ContainerStartContext.class);
-    verify(mockExecutor).launchContainer(captor.capture());
+    verify(mockExecutor).relaunchContainer(captor.capture());
     ContainerStartContext csc = captor.getValue();
     assertNotNull("app ID null", csc.getAppId());
     assertNotNull("container null", csc.getContainer());

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/TestDockerContainerRuntime.java

@@ -44,10 +44,12 @@ import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.privileg
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.privileged.PrivilegedOperationException;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.privileged.PrivilegedOperationExecutor;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupsHandler;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerClient;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerCommandExecutor;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerKillCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerRmCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerRunCommand;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerStartCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerStopCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker.DockerVolumeCommand;
 import org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.DockerCommandPlugin;
@@ -102,6 +104,7 @@ import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.r
 import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.LinuxContainerRuntimeConstants.RESOURCES_OPTIONS;
 import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.LinuxContainerRuntimeConstants.RUN_AS_USER;
 import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.LinuxContainerRuntimeConstants.SIGNAL;
+import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.LinuxContainerRuntimeConstants.TC_COMMAND_FILE;
 import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.LinuxContainerRuntimeConstants.USER;
 import static org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.LinuxContainerRuntimeConstants.USER_FILECACHE_DIRS;
 import static org.mockito.Matchers.anyString;
@@ -1942,6 +1945,32 @@ public class TestDockerContainerRuntime {
         dockerCommands.get(counter++));
   }
 
+  @Test
+  public void testDockerContainerRelaunch()
+      throws ContainerExecutionException, PrivilegedOperationException,
+      IOException {
+    DockerLinuxContainerRuntime runtime = new MockRuntime(mockExecutor,
+        DockerCommandExecutor.DockerContainerStatus.EXITED, false);
+    runtime.initialize(conf, null);
+    runtime.relaunchContainer(builder.build());
+
+    PrivilegedOperation op = capturePrivilegedOperation();
+    List<String> args = op.getArguments();
+    String dockerCommandFile = args.get(11);
+
+    List<String> dockerCommands = Files.readAllLines(
+        Paths.get(dockerCommandFile), Charset.forName("UTF-8"));
+
+    int expected = 3;
+    int counter = 0;
+    Assert.assertEquals(expected, dockerCommands.size());
+    Assert.assertEquals("[docker-command-execution]",
+        dockerCommands.get(counter++));
+    Assert.assertEquals("  docker-command=start",
+        dockerCommands.get(counter++));
+    Assert.assertEquals("  name=container_id", dockerCommands.get(counter));
+  }
+
   class MockRuntime extends DockerLinuxContainerRuntime {
 
     private PrivilegedOperationExecutor privilegedOperationExecutor;
@@ -2008,5 +2037,66 @@ public class TestDockerContainerRuntime {
         }
       }
     }
+
+    @Override
+    public void relaunchContainer(ContainerRuntimeContext ctx)
+        throws ContainerExecutionException {
+      if (DockerCommandExecutor.isRemovable(containerStatus)) {
+        String relaunchContainerIdStr =
+            ctx.getContainer().getContainerId().toString();
+        DockerStartCommand startCommand =
+            new DockerStartCommand(containerIdStr);
+        DockerClient dockerClient = new DockerClient(conf);
+        String commandFile = dockerClient.writeCommandToTempFile(startCommand,
+            relaunchContainerIdStr);
+        String relaunchRunAsUser = ctx.getExecutionAttribute(RUN_AS_USER);
+        Path relaunchNmPrivateContainerScriptPath = ctx.getExecutionAttribute(
+            NM_PRIVATE_CONTAINER_SCRIPT_PATH);
+        Path relaunchContainerWorkDir =
+            ctx.getExecutionAttribute(CONTAINER_WORK_DIR);
+        //we can't do better here thanks to type-erasure
+        @SuppressWarnings("unchecked")
+        List<String> relaunchLocalDirs = ctx.getExecutionAttribute(LOCAL_DIRS);
+        @SuppressWarnings("unchecked")
+        List<String> relaunchLogDirs = ctx.getExecutionAttribute(LOG_DIRS);
+        String resourcesOpts = ctx.getExecutionAttribute(RESOURCES_OPTIONS);
+
+        PrivilegedOperation launchOp = new PrivilegedOperation(
+            PrivilegedOperation.OperationType.LAUNCH_DOCKER_CONTAINER);
+
+        launchOp.appendArgs(relaunchRunAsUser, ctx.getExecutionAttribute(USER),
+            Integer.toString(PrivilegedOperation
+                .RunAsUserCommand.LAUNCH_DOCKER_CONTAINER.getValue()),
+            ctx.getExecutionAttribute(APPID),
+            relaunchContainerIdStr,
+            relaunchContainerWorkDir.toString(),
+            relaunchNmPrivateContainerScriptPath.toUri().getPath(),
+            ctx.getExecutionAttribute(NM_PRIVATE_TOKENS_PATH).toUri().getPath(),
+            ctx.getExecutionAttribute(PID_FILE_PATH).toString(),
+            StringUtils.join(PrivilegedOperation.LINUX_FILE_PATH_SEPARATOR,
+                relaunchLocalDirs),
+            StringUtils.join(PrivilegedOperation.LINUX_FILE_PATH_SEPARATOR,
+                relaunchLogDirs),
+            commandFile,
+            resourcesOpts);
+
+        String tcCommandFile = ctx.getExecutionAttribute(TC_COMMAND_FILE);
+
+        if (tcCommandFile != null) {
+          launchOp.appendArgs(tcCommandFile);
+        }
+
+        try {
+          privilegedOperationExecutor.executePrivilegedOperation(null,
+              launchOp, null, null, false, false);
+        } catch (PrivilegedOperationException e) {
+          LOG.warn("Relaunch container failed. Exception: ", e);
+          LOG.info("Docker command used: " + startCommand);
+
+          throw new ContainerExecutionException("Launch container failed", e
+              .getExitCode(), e.getOutput(), e.getErrorOutput());
+        }
+      }
+    }
   }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/TestDockerStartCommand.java

@@ -0,0 +1,53 @@
+/*
+ * 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.yarn.server.nodemanager.containermanager.linux.runtime.docker;
+
+import org.apache.hadoop.util.StringUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Tests the docker start command and any command line arguments.
+ */
+public class TestDockerStartCommand {
+
+  private DockerStartCommand dockerStartCommand;
+
+  private static final String CONTAINER_NAME = "foo";
+
+  @Before
+  public void setUp() {
+    dockerStartCommand = new DockerStartCommand(CONTAINER_NAME);
+  }
+
+  @Test
+  public void testGetCommandOption() {
+    assertEquals("start", dockerStartCommand.getCommandOption());
+  }
+
+  @Test
+  public void testGetCommandWithArguments() {
+    assertEquals("start", StringUtils.join(",",
+        dockerStartCommand.getDockerCommandWithArguments()
+            .get("docker-command")));
+    assertEquals("foo", StringUtils.join(",",
+        dockerStartCommand.getDockerCommandWithArguments().get("name")));
+    assertEquals(2, dockerStartCommand.getDockerCommandWithArguments().size());
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/monitor/TestContainersMonitorResourceChange.java

@@ -86,6 +86,11 @@ public class TestContainersMonitorResourceChange {
       return 0;
     }
     @Override
+    public int relaunchContainer(ContainerStartContext ctx) throws
+        IOException, ConfigurationException {
+      return 0;
+    }
+    @Override
     public boolean signalContainer(ContainerSignalContext ctx)
         throws IOException {
       return true;