HADOOP-13737. Cleanup DiskChecker interface. Contributed by Arpit Agarwal.
This commit is contained in:
Anu Engineer
parent
5e83a21cb6
commit
262827cf75
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@ -20,9 +20,6 @@
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.DirectoryStream;
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import java.nio.file.DirectoryIteratorException;
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import java.nio.file.Files;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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@ -53,62 +50,6 @@ public DiskOutOfSpaceException(String msg) {
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}
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}
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/**
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* The semantics of mkdirsWithExistsCheck method is different from the mkdirs
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* method provided in the Sun's java.io.File class in the following way:
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* While creating the non-existent parent directories, this method checks for
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* the existence of those directories if the mkdir fails at any point (since
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* that directory might have just been created by some other process).
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* If both mkdir() and the exists() check fails for any seemingly
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* non-existent directory, then we signal an error; Sun's mkdir would signal
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* an error (return false) if a directory it is attempting to create already
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* exists or the mkdir fails.
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* @param dir
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* @return true on success, false on failure
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*/
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public static boolean mkdirsWithExistsCheck(File dir) {
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if (dir.mkdir() || dir.exists()) {
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return true;
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}
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File canonDir = null;
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try {
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canonDir = dir.getCanonicalFile();
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} catch (IOException e) {
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return false;
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}
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String parent = canonDir.getParent();
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return (parent != null) &&
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(mkdirsWithExistsCheck(new File(parent)) &&
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(canonDir.mkdir() || canonDir.exists()));
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}
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/**
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* Recurse down a directory tree, checking all child directories.
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* @param dir
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* @throws DiskErrorException
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*/
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public static void checkDirs(File dir) throws DiskErrorException {
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checkDir(dir);
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IOException ex = null;
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try (DirectoryStream<java.nio.file.Path> stream =
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Files.newDirectoryStream(dir.toPath())) {
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for (java.nio.file.Path entry: stream) {
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File child = entry.toFile();
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if (child.isDirectory()) {
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checkDirs(child);
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}
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}
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} catch (DirectoryIteratorException de) {
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ex = de.getCause();
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} catch (IOException ie) {
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ex = ie;
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}
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if (ex != null) {
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throw new DiskErrorException("I/O error when open a directory: "
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+ dir.toString(), ex);
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}
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}
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/**
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* Create the directory if it doesn't exist and check that dir is readable,
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* writable and executable
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@ -121,7 +62,84 @@ public static void checkDir(File dir) throws DiskErrorException {
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throw new DiskErrorException("Cannot create directory: "
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+ dir.toString());
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}
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checkDirAccess(dir);
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checkAccessByFileMethods(dir);
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}
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/**
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* Create the local directory if necessary, check permissions and also ensure
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* it can be read from and written into.
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*
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* @param localFS local filesystem
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* @param dir directory
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* @param expected permission
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* @throws DiskErrorException
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* @throws IOException
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*/
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public static void checkDir(LocalFileSystem localFS, Path dir,
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FsPermission expected)
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throws DiskErrorException, IOException {
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mkdirsWithExistsAndPermissionCheck(localFS, dir, expected);
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checkAccessByFileMethods(localFS.pathToFile(dir));
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}
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/**
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* Checks that the current running process can read, write, and execute the
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* given directory by using methods of the File object.
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*
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* @param dir File to check
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* @throws DiskErrorException if dir is not readable, not writable, or not
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* executable
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*/
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private static void checkAccessByFileMethods(File dir)
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throws DiskErrorException {
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if (!dir.isDirectory()) {
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throw new DiskErrorException("Not a directory: "
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+ dir.toString());
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}
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if (!FileUtil.canRead(dir)) {
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throw new DiskErrorException("Directory is not readable: "
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+ dir.toString());
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}
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if (!FileUtil.canWrite(dir)) {
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throw new DiskErrorException("Directory is not writable: "
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+ dir.toString());
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}
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if (!FileUtil.canExecute(dir)) {
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throw new DiskErrorException("Directory is not executable: "
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+ dir.toString());
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}
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}
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/**
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* The semantics of mkdirsWithExistsCheck method is different from the mkdirs
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* method provided in the Sun's java.io.File class in the following way:
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* While creating the non-existent parent directories, this method checks for
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* the existence of those directories if the mkdir fails at any point (since
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* that directory might have just been created by some other process).
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* If both mkdir() and the exists() check fails for any seemingly
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* non-existent directory, then we signal an error; Sun's mkdir would signal
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* an error (return false) if a directory it is attempting to create already
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* exists or the mkdir fails.
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* @param dir
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* @return true on success, false on failure
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*/
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private static boolean mkdirsWithExistsCheck(File dir) {
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if (dir.mkdir() || dir.exists()) {
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return true;
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}
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File canonDir;
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try {
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canonDir = dir.getCanonicalFile();
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} catch (IOException e) {
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return false;
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}
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String parent = canonDir.getParent();
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return (parent != null) &&
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(mkdirsWithExistsCheck(new File(parent)) &&
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(canonDir.mkdir() || canonDir.exists()));
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}
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/**
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@ -143,7 +161,7 @@ public static void checkDir(File dir) throws DiskErrorException {
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* @param expected expected permission
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* @throws IOException
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*/
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public static void mkdirsWithExistsAndPermissionCheck(
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static void mkdirsWithExistsAndPermissionCheck(
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LocalFileSystem localFS, Path dir, FsPermission expected)
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throws IOException {
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File directory = localFS.pathToFile(dir);
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@ -153,66 +171,6 @@ public static void mkdirsWithExistsAndPermissionCheck(
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created = mkdirsWithExistsCheck(directory);
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if (created || !localFS.getFileStatus(dir).getPermission().equals(expected))
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localFS.setPermission(dir, expected);
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}
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/**
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* Create the local directory if necessary, check permissions and also ensure
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* it can be read from and written into.
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*
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* @param localFS local filesystem
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* @param dir directory
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* @param expected permission
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* @throws DiskErrorException
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* @throws IOException
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*/
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public static void checkDir(LocalFileSystem localFS, Path dir,
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FsPermission expected)
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throws DiskErrorException, IOException {
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mkdirsWithExistsAndPermissionCheck(localFS, dir, expected);
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checkDirAccess(localFS.pathToFile(dir));
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}
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/**
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* Checks that the given file is a directory and that the current running
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* process can read, write, and execute it.
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*
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* @param dir File to check
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* @throws DiskErrorException if dir is not a directory, not readable, not
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* writable, or not executable
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*/
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private static void checkDirAccess(File dir) throws DiskErrorException {
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if (!dir.isDirectory()) {
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throw new DiskErrorException("Not a directory: "
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+ dir.toString());
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}
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checkAccessByFileMethods(dir);
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}
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/**
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* Checks that the current running process can read, write, and execute the
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* given directory by using methods of the File object.
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*
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* @param dir File to check
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* @throws DiskErrorException if dir is not readable, not writable, or not
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* executable
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*/
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private static void checkAccessByFileMethods(File dir)
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throws DiskErrorException {
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if (!FileUtil.canRead(dir)) {
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throw new DiskErrorException("Directory is not readable: "
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+ dir.toString());
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}
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if (!FileUtil.canWrite(dir)) {
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throw new DiskErrorException("Directory is not writable: "
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+ dir.toString());
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}
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if (!FileUtil.canExecute(dir)) {
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throw new DiskErrorException("Directory is not executable: "
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+ dir.toString());
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}
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localFS.setPermission(dir, expected);
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}
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}
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@ -32,7 +32,6 @@
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import org.apache.hadoop.fs.LocalFileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.fs.permission.FsPermission;
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import org.apache.hadoop.test.GenericTestUtils;
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import org.apache.hadoop.util.DiskChecker.DiskErrorException;
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public class TestDiskChecker {
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@ -192,25 +191,4 @@ protected void checkDirs(boolean isDir, String perm, boolean success)
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System.out.println("checkDir success: " + success);
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}
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@Test (timeout = 30000)
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public void testCheckDirsIOException() throws Throwable {
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Path path = new Path("target", TestDiskChecker.class.getSimpleName());
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File localDir = new File(path.toUri().getRawPath());
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localDir.mkdir();
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File localFile = new File(localDir, "test");
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localFile.createNewFile();
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File spyLocalDir = spy(localDir);
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doReturn(localFile.toPath()).when(spyLocalDir).toPath();
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try {
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DiskChecker.checkDirs(spyLocalDir);
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fail("Expected exception for I/O error");
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} catch (DiskErrorException e) {
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GenericTestUtils.assertExceptionContains("I/O error", e);
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assertTrue(e.getCause() instanceof IOException);
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} finally {
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localFile.delete();
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localDir.delete();
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}
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}
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}
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