YARN-5466. DefaultContainerExecutor needs JavaDocs (templedf via rkanter)
This commit is contained in:
Robert Kanter
parent
8fd4c37c45
commit
f5d9235914
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@ -65,6 +65,11 @@
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import com.google.common.annotations.VisibleForTesting;
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import com.google.common.base.Optional;
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/**
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* The {@code DefaultContainerExecuter} class offers generic container
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* execution services. Process execution is handled in a platform-independent
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* way via {@link ProcessBuilder}.
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*/
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public class DefaultContainerExecutor extends ContainerExecutor {
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private static final Log LOG = LogFactory
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@ -72,10 +77,17 @@ public class DefaultContainerExecutor extends ContainerExecutor {
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private static final int WIN_MAX_PATH = 260;
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/**
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* A {@link FileContext} for the local file system.
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*/
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protected final FileContext lfs;
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private String logDirPermissions = null;
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/**
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* Default constructor for use in testing.
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*/
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@VisibleForTesting
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public DefaultContainerExecutor() {
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try {
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this.lfs = FileContext.getLocalFSFileContext();
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@ -84,15 +96,40 @@ public DefaultContainerExecutor() {
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}
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}
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/**
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* Create an instance with a given {@link FileContext}.
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*
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* @param lfs the given {@link FileContext}
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*/
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DefaultContainerExecutor(FileContext lfs) {
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this.lfs = lfs;
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}
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/**
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* Copy a file using the {@link #lfs} {@link FileContext}.
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*
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* @param src the file to copy
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* @param dst where to copy the file
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* @param owner the owner of the new copy. Used only in secure Windows
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* clusters
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* @throws IOException when the copy fails
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* @see WindowsSecureContainerExecutor
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*/
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protected void copyFile(Path src, Path dst, String owner) throws IOException {
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lfs.util().copy(src, dst, false, true);
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}
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protected void setScriptExecutable(Path script, String owner) throws IOException {
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/**
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* Make a file executable using the {@link #lfs} {@link FileContext}.
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*
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* @param script the path to make executable
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* @param owner the new owner for the file. Used only in secure Windows
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* clusters
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* @throws IOException when the change mode operation fails
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* @see WindowsSecureContainerExecutor
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*/
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protected void setScriptExecutable(Path script, String owner)
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throws IOException {
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lfs.setPermission(script, ContainerExecutor.TASK_LAUNCH_SCRIPT_PERMISSION);
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}
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@ -122,14 +159,16 @@ public void startLocalizer(LocalizerStartContext ctx)
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// randomly choose the local directory
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Path appStorageDir = getWorkingDir(localDirs, user, appId);
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String tokenFn = String.format(ContainerLocalizer.TOKEN_FILE_NAME_FMT, locId);
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String tokenFn =
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String.format(ContainerLocalizer.TOKEN_FILE_NAME_FMT, locId);
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Path tokenDst = new Path(appStorageDir, tokenFn);
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copyFile(nmPrivateContainerTokensPath, tokenDst, user);
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LOG.info("Copying from " + nmPrivateContainerTokensPath + " to " + tokenDst);
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LOG.info("Copying from " + nmPrivateContainerTokensPath
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+ " to " + tokenDst);
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FileContext localizerFc = FileContext.getFileContext(
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lfs.getDefaultFileSystem(), getConf());
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FileContext localizerFc =
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FileContext.getFileContext(lfs.getDefaultFileSystem(), getConf());
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localizerFc.setUMask(lfs.getUMask());
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localizerFc.setWorkingDirectory(appStorageDir);
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LOG.info("Localizer CWD set to " + appStorageDir + " = "
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@ -141,6 +180,22 @@ public void startLocalizer(LocalizerStartContext ctx)
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localizer.runLocalization(nmAddr);
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}
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/**
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* Create a new {@link ContainerLocalizer} instance.
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*
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* @param user the user who owns the job for which the localization is being
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* run
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* @param appId the ID of the application for which the localization is being
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* run
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* @param locId the ID of the container for which the localization is being
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* run
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* @param localDirs a list of directories to use as destinations for the
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* localization
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* @param localizerFc the {@link FileContext} to use when localizing files
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* @return the new {@link ContainerLocalizer} instance
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* @throws IOException if {@code user} or {@code locId} is {@code null} or if
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* the container localizer has an initialization failure
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*/
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@Private
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@VisibleForTesting
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protected ContainerLocalizer createContainerLocalizer(String user,
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@ -258,15 +313,17 @@ public int launchContainer(ContainerStartContext ctx) throws IOException {
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StringBuilder builder = new StringBuilder();
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builder.append("Exception from container-launch.\n");
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builder.append("Container id: " + containerId + "\n");
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builder.append("Exit code: " + exitCode + "\n");
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builder.append("Container id: ").append(containerId).append("\n");
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builder.append("Exit code: ").append(exitCode).append("\n");
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if (!Optional.fromNullable(e.getMessage()).or("").isEmpty()) {
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builder.append("Exception message: " + e.getMessage() + "\n");
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builder.append("Exception message: ");
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builder.append(e.getMessage()).append("\n");
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}
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builder.append("Stack trace: "
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+ StringUtils.stringifyException(e) + "\n");
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builder.append("Stack trace: ");
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builder.append(StringUtils.stringifyException(e)).append("\n");
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if (!shExec.getOutput().isEmpty()) {
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builder.append("Shell output: " + shExec.getOutput() + "\n");
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builder.append("Shell output: ");
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builder.append(shExec.getOutput()).append("\n");
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}
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String diagnostics = builder.toString();
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logOutput(diagnostics);
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@ -283,10 +340,24 @@ public int launchContainer(ContainerStartContext ctx) throws IOException {
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return 0;
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}
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/**
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* Create a new {@link ShellCommandExecutor} using the parameters.
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*
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* @param wrapperScriptPath the path to the script to execute
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* @param containerIdStr the container ID
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* @param user the application owner's username
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* @param pidFile the path to the container's PID file
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* @param resource this parameter controls memory and CPU limits.
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* @param workDir If not-null, specifies the directory which should be set
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* as the current working directory for the command. If null,
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* the current working directory is not modified.
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* @param environment the container environment
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* @return the new {@link ShellCommandExecutor}
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* @see ShellCommandExecutor
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*/
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protected CommandExecutor buildCommandExecutor(String wrapperScriptPath,
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String containerIdStr, String user, Path pidFile, Resource resource,
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File wordDir, Map<String, String> environment)
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throws IOException {
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File workDir, Map<String, String> environment) {
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String[] command = getRunCommand(wrapperScriptPath,
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containerIdStr, user, pidFile, this.getConf(), resource);
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@ -294,12 +365,20 @@ protected CommandExecutor buildCommandExecutor(String wrapperScriptPath,
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LOG.info("launchContainer: " + Arrays.toString(command));
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return new ShellCommandExecutor(
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command,
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wordDir,
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workDir,
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environment,
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0L,
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false);
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}
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/**
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* Create a {@link LocalWrapperScriptBuilder} for the given container ID
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* and path that is appropriate to the current platform.
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*
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* @param containerIdStr the container ID
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* @param containerWorkDir the container's working directory
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* @return a new {@link LocalWrapperScriptBuilder}
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*/
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protected LocalWrapperScriptBuilder getLocalWrapperScriptBuilder(
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String containerIdStr, Path containerWorkDir) {
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return Shell.WINDOWS ?
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@ -307,15 +386,34 @@ protected LocalWrapperScriptBuilder getLocalWrapperScriptBuilder(
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new UnixLocalWrapperScriptBuilder(containerWorkDir);
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}
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/**
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* This class is a utility to create a wrapper script that is platform
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* appropriate.
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*/
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protected abstract class LocalWrapperScriptBuilder {
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private final Path wrapperScriptPath;
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/**
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* Return the path for the wrapper script.
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*
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* @return the path for the wrapper script
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*/
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public Path getWrapperScriptPath() {
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return wrapperScriptPath;
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}
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public void writeLocalWrapperScript(Path launchDst, Path pidFile) throws IOException {
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/**
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* Write out the wrapper script for the container launch script. This method
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* will create the script at the configured wrapper script path.
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*
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* @param launchDst the script to launch
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* @param pidFile the file that will hold the PID
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* @throws IOException if the wrapper script cannot be created
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* @see #getWrapperScriptPath
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*/
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public void writeLocalWrapperScript(Path launchDst, Path pidFile)
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throws IOException {
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DataOutputStream out = null;
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PrintStream pout = null;
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@ -328,19 +426,40 @@ public void writeLocalWrapperScript(Path launchDst, Path pidFile) throws IOExcep
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}
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}
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protected abstract void writeLocalWrapperScript(Path launchDst, Path pidFile,
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PrintStream pout);
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/**
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* Write out the wrapper script for the container launch script.
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*
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* @param launchDst the script to launch
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* @param pidFile the file that will hold the PID
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* @param pout the stream to use to write out the wrapper script
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*/
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protected abstract void writeLocalWrapperScript(Path launchDst,
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Path pidFile, PrintStream pout);
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/**
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* Create an instance for the given container working directory.
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*
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* @param containerWorkDir the working directory for the container
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*/
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protected LocalWrapperScriptBuilder(Path containerWorkDir) {
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this.wrapperScriptPath = new Path(containerWorkDir,
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Shell.appendScriptExtension("default_container_executor"));
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}
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}
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/**
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* This class is an instance of {@link LocalWrapperScriptBuilder} for
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* non-Windows hosts.
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*/
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private final class UnixLocalWrapperScriptBuilder
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extends LocalWrapperScriptBuilder {
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private final Path sessionScriptPath;
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/**
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* Create an instance for the given container path.
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*
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* @param containerWorkDir the container's working directory
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*/
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public UnixLocalWrapperScriptBuilder(Path containerWorkDir) {
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super(containerWorkDir);
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this.sessionScriptPath = new Path(containerWorkDir,
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@ -383,8 +502,7 @@ private void writeSessionScript(Path launchDst, Path pidFile)
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pout.println("echo $$ > " + pidFile.toString() + ".tmp");
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pout.println("/bin/mv -f " + pidFile.toString() + ".tmp " + pidFile);
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String exec = Shell.isSetsidAvailable? "exec setsid" : "exec";
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pout.println(exec + " /bin/bash \"" +
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launchDst.toUri().getPath().toString() + "\"");
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pout.printf("%s /bin/bash \"%s\"", exec, launchDst.toUri().getPath());
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} finally {
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IOUtils.cleanup(LOG, pout, out);
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}
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@ -393,11 +511,21 @@ private void writeSessionScript(Path launchDst, Path pidFile)
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}
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}
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/**
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* This class is an instance of {@link LocalWrapperScriptBuilder} for
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* Windows hosts.
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*/
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private final class WindowsLocalWrapperScriptBuilder
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extends LocalWrapperScriptBuilder {
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private final String containerIdStr;
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/**
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* Create an instance for the given container and working directory.
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*
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* @param containerIdStr the container ID
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* @param containerWorkDir the container's working directory
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*/
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public WindowsLocalWrapperScriptBuilder(String containerIdStr,
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Path containerWorkDir) {
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@ -458,6 +586,7 @@ public boolean isContainerAlive(ContainerLivenessContext ctx)
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*
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* @param pid String pid
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* @return boolean true if the process is alive
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* @throws IOException if the command to test process liveliness fails
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*/
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@VisibleForTesting
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public static boolean containerIsAlive(String pid) throws IOException {
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@ -478,7 +607,7 @@ public static boolean containerIsAlive(String pid) throws IOException {
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*
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* @param pid the pid of the process [group] to signal.
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* @param signal signal to send
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* (for logging).
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* @throws IOException if the command to kill the process fails
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*/
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protected void killContainer(String pid, Signal signal) throws IOException {
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new ShellCommandExecutor(Shell.getSignalKillCommand(signal.getValue(), pid))
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@ -517,17 +646,25 @@ public void symLink(String target, String symlink) throws IOException {
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FileUtil.symLink(target, symlink);
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}
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/** Permissions for user dir.
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* $local.dir/usercache/$user */
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/**
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* Permissions for user dir.
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* $local.dir/usercache/$user
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*/
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static final short USER_PERM = (short)0750;
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/** Permissions for user appcache dir.
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* $local.dir/usercache/$user/appcache */
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/**
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* Permissions for user appcache dir.
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* $local.dir/usercache/$user/appcache
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*/
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static final short APPCACHE_PERM = (short)0710;
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/** Permissions for user filecache dir.
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* $local.dir/usercache/$user/filecache */
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/**
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* Permissions for user filecache dir.
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* $local.dir/usercache/$user/filecache
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*/
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static final short FILECACHE_PERM = (short)0710;
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/** Permissions for user app dir.
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* $local.dir/usercache/$user/appcache/$appId */
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/**
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* Permissions for user app dir.
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* $local.dir/usercache/$user/appcache/$appId
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*/
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static final short APPDIR_PERM = (short)0710;
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private long getDiskFreeSpace(Path base) throws IOException {
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@ -552,9 +689,20 @@ private Path getFileCacheDir(Path base, String user) {
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ContainerLocalizer.FILECACHE);
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}
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/**
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* Return a randomly chosen application directory from a list of local storage
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* directories. The probability of selecting a directory is proportional to
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* its size.
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*
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* @param localDirs the target directories from which to select
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* @param user the user who owns the application
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* @param appId the application ID
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* @return the selected directory
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* @throws IOException if no application directories for the user can be
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* found
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*/
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protected Path getWorkingDir(List<String> localDirs, String user,
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String appId) throws IOException {
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Path appStorageDir = null;
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long totalAvailable = 0L;
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long[] availableOnDisk = new long[localDirs.size()];
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int i = 0;
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@ -563,8 +711,7 @@ protected Path getWorkingDir(List<String> localDirs, String user,
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// the available space on the directory.
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// firstly calculate the sum of all available space on these directories
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for (String localDir : localDirs) {
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Path curBase = getApplicationDir(new Path(localDir),
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user, appId);
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Path curBase = getApplicationDir(new Path(localDir), user, appId);
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long space = 0L;
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try {
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space = getDiskFreeSpace(curBase);
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@ -577,8 +724,7 @@ protected Path getWorkingDir(List<String> localDirs, String user,
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// throw an IOException if totalAvailable is 0.
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if (totalAvailable <= 0L) {
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throw new IOException("Not able to find a working directory for "
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+ user);
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throw new IOException("Not able to find a working directory for " + user);
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}
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// make probability to pick a directory proportional to
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@ -595,12 +741,21 @@ protected Path getWorkingDir(List<String> localDirs, String user,
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while (randomPosition > availableOnDisk[dir]) {
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randomPosition -= availableOnDisk[dir++];
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}
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appStorageDir = getApplicationDir(new Path(localDirs.get(dir)),
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user, appId);
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return appStorageDir;
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return getApplicationDir(new Path(localDirs.get(dir)), user, appId);
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}
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/**
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* Use the {@link #lfs} {@link FileContext} to create the target directory.
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*
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* @param dirPath the target directory
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* @param perms the target permissions for the target directory
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* @param createParent whether the parent directories should also be created
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* @param user the user as whom the target directory should be created.
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* Used only on secure Windows hosts.
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* @throws IOException if there's a failure performing a file operation
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* @see WindowsSecureContainerExecutor
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*/
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protected void createDir(Path dirPath, FsPermission perms,
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boolean createParent, String user) throws IOException {
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lfs.mkdir(dirPath, perms, createParent);
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@ -614,6 +769,11 @@ protected void createDir(Path dirPath, FsPermission perms,
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* <ul>.mkdir
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* <li>$local.dir/usercache/$user</li>
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* </ul>
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*
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* @param localDirs the target directories to create
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* @param user the user whose local cache directories should be initialized
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* @throws IOException if there's an issue initializing the user local
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* directories
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*/
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void createUserLocalDirs(List<String> localDirs, String user)
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throws IOException {
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@ -622,7 +782,8 @@ void createUserLocalDirs(List<String> localDirs, String user)
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for (String localDir : localDirs) {
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// create $local.dir/usercache/$user and its immediate parent
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try {
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createDir(getUserCacheDir(new Path(localDir), user), userperms, true, user);
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createDir(getUserCacheDir(new Path(localDir), user), userperms, true,
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user);
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} catch (IOException e) {
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LOG.warn("Unable to create the user directory : " + localDir, e);
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continue;
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@ -643,6 +804,11 @@ void createUserLocalDirs(List<String> localDirs, String user)
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* <li>$local.dir/usercache/$user/appcache</li>
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* <li>$local.dir/usercache/$user/filecache</li>
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* </ul>
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*
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* @param localDirs the target directories to create
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* @param user the user whose local cache directories should be initialized
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* @throws IOException if there's an issue initializing the cache
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* directories
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*/
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void createUserCacheDirs(List<String> localDirs, String user)
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throws IOException {
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|
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@ -689,7 +855,12 @@ void createUserCacheDirs(List<String> localDirs, String user)
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* <ul>
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* <li>$local.dir/usercache/$user/appcache/$appid</li>
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* </ul>
|
||||
* @param localDirs
|
||||
*
|
||||
* @param localDirs the target directories to create
|
||||
* @param user the user whose local cache directories should be initialized
|
||||
* @param appId the application ID
|
||||
* @throws IOException if there's an issue initializing the application
|
||||
* directories
|
||||
*/
|
||||
void createAppDirs(List<String> localDirs, String user, String appId)
|
||||
throws IOException {
|
||||
|
|
@ -714,6 +885,12 @@ void createAppDirs(List<String> localDirs, String user, String appId)
|
|||
|
||||
/**
|
||||
* Create application log directories on all disks.
|
||||
*
|
||||
* @param appId the application ID
|
||||
* @param logDirs the target directories to create
|
||||
* @param user the user whose local cache directories should be initialized
|
||||
* @throws IOException if there's an issue initializing the application log
|
||||
* directories
|
||||
*/
|
||||
void createAppLogDirs(String appId, List<String> logDirs, String user)
|
||||
throws IOException {
|
||||
|
|
@ -740,10 +917,17 @@ void createAppLogDirs(String appId, List<String> logDirs, String user)
|
|||
|
||||
/**
|
||||
* Create application log directories on all disks.
|
||||
*
|
||||
* @param appId the application ID
|
||||
* @param containerId the container ID
|
||||
* @param logDirs the target directories to create
|
||||
* @param user the user as whom the directories should be created.
|
||||
* Used only on secure Windows hosts.
|
||||
* @throws IOException if there's an issue initializing the container log
|
||||
* directories
|
||||
*/
|
||||
void createContainerLogDirs(String appId, String containerId,
|
||||
List<String> logDirs, String user) throws IOException {
|
||||
|
||||
boolean containerLogDirStatus = false;
|
||||
FsPermission containerLogDirPerms = new
|
||||
FsPermission(getLogDirPermissions());
|
||||
|
|
@ -769,7 +953,9 @@ void createContainerLogDirs(String appId, String containerId,
|
|||
}
|
||||
|
||||
/**
|
||||
* Return default container log directory permissions.
|
||||
* Return the default container log directory permissions.
|
||||
*
|
||||
* @return the default container log directory permissions
|
||||
*/
|
||||
@VisibleForTesting
|
||||
public String getLogDirPermissions() {
|
||||
|
|
@ -790,10 +976,12 @@ public void clearLogDirPermissions() {
|
|||
}
|
||||
|
||||
/**
|
||||
* Return the list of paths of given local directories.
|
||||
*
|
||||
* @return the list of paths of given local directories
|
||||
*/
|
||||
private static List<Path> getPaths(List<String> dirs) {
|
||||
List<Path> paths = new ArrayList<Path>(dirs.size());
|
||||
List<Path> paths = new ArrayList<>(dirs.size());
|
||||
for (int i = 0; i < dirs.size(); i++) {
|
||||
paths.add(new Path(dirs.get(i)));
|
||||
}
|
||||
|
|
|
|||
|
|
@ -732,7 +732,7 @@ public void startLocalizer(LocalizerStartContext ctx) throws IOException,
|
|||
@Override
|
||||
protected CommandExecutor buildCommandExecutor(String wrapperScriptPath,
|
||||
String containerIdStr, String userName, Path pidFile, Resource resource,
|
||||
File wordDir, Map<String, String> environment) throws IOException {
|
||||
File wordDir, Map<String, String> environment) {
|
||||
return new WintuilsProcessStubExecutor(
|
||||
wordDir.toString(),
|
||||
containerIdStr, userName, pidFile.toString(),
|
||||
|
|
|
|||
Loading…
Reference in New Issue