From 44ebf5db23ac5c22e347458fcc75389d78e4249d Mon Sep 17 00:00:00 2001 From: Sharad Agarwal Date: Thu, 6 May 2010 11:18:12 +0000 Subject: [PATCH] HADOOP-6631. Fix FileUtil.fullyDelete() to continue deleting other files despite failure at any level. Contributed by Ravi Gummadi and Vinod Kumar Vavilapalli. git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@941662 13f79535-47bb-0310-9956-ffa450edef68 --- CHANGES.txt | 4 + src/java/org/apache/hadoop/fs/FileUtil.java | 9 +- .../org/apache/hadoop/fs/TestFileUtil.java | 148 +++++++++++++++--- 3 files changed, 133 insertions(+), 28 deletions(-) diff --git a/CHANGES.txt b/CHANGES.txt index 33663d398af..c66e55a3fe1 100644 --- a/CHANGES.txt +++ b/CHANGES.txt @@ -1532,6 +1532,10 @@ Release 0.21.0 - Unreleased HADOOP-6727. Remove UnresolvedLinkException from public FileContext APIs. (Eli Collins via tomwhite) + HADOOP-6631. Fix FileUtil.fullyDelete() to continue deleting other files + despite failure at any level. (Contributed by Ravi Gummadi and + Vinod Kumar Vavilapalli) + Release 0.20.3 - Unreleased NEW FEATURES diff --git a/src/java/org/apache/hadoop/fs/FileUtil.java b/src/java/org/apache/hadoop/fs/FileUtil.java index 940cd1cebee..bcfa563f869 100644 --- a/src/java/org/apache/hadoop/fs/FileUtil.java +++ b/src/java/org/apache/hadoop/fs/FileUtil.java @@ -87,12 +87,14 @@ public class FileUtil { * we return false, the directory may be partially-deleted. */ public static boolean fullyDeleteContents(File dir) throws IOException { + boolean deletionSucceeded = true; File contents[] = dir.listFiles(); if (contents != null) { for (int i = 0; i < contents.length; i++) { if (contents[i].isFile()) { if (!contents[i].delete()) { - return false; + deletionSucceeded = false; + continue; // continue deletion of other files/dirs under dir } } else { //try deleting the directory @@ -106,12 +108,13 @@ public class FileUtil { // if not an empty directory or symlink let // fullydelete handle it. if (!fullyDelete(contents[i])) { - return false; + deletionSucceeded = false; + continue; // continue deletion of other files/dirs under dir } } } } - return true; + return deletionSucceeded; } /** diff --git a/src/test/core/org/apache/hadoop/fs/TestFileUtil.java b/src/test/core/org/apache/hadoop/fs/TestFileUtil.java index fcbb9eeb9c5..886ef81fd63 100644 --- a/src/test/core/org/apache/hadoop/fs/TestFileUtil.java +++ b/src/test/core/org/apache/hadoop/fs/TestFileUtil.java @@ -19,12 +19,19 @@ package org.apache.hadoop.fs; import java.io.File; import java.io.IOException; +import java.util.Arrays; +import java.util.Collections; +import java.util.List; +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; import org.junit.After; import org.junit.Assert; import org.junit.Test; public class TestFileUtil { + private static final Log LOG = LogFactory.getLog(TestFileUtil.class); + final static private File TEST_DIR = new File(System.getProperty( "test.build.data", "/tmp"), "fu"); private static String FILE = "x"; @@ -103,52 +110,143 @@ public class TestFileUtil { Assert.assertEquals(1, tmp.listFiles().length); Assert.assertTrue(new File(tmp, FILE).exists()); } + + private File xSubDir = new File(del, "xsubdir"); + private File ySubDir = new File(del, "ysubdir"); + static String file1Name = "file1"; + private File file2 = new File(xSubDir, "file2"); + private File file3 = new File(ySubDir, "file3"); + private File zlink = new File(del, "zlink"); /** - * Creates a directory which can not be deleted. + * Creates a directory which can not be deleted completely. * - * Contents of the directory are : - * dir : del - * dir : dir1 : x. this directory is not writable + * Directory structure. The naming is important in that {@link MyFile} + * is used to return them in alphabetical order when listed. + * + * del(+w) + * | + * .---------------------------------------, + * | | | | + * file1(!w) xsubdir(-w) ysubdir(+w) zlink + * | | + * file2 file3 + * * @throws IOException */ private void setupDirsAndNonWritablePermissions() throws IOException { - Assert.assertFalse(del.exists()); + Assert.assertFalse("The directory del should not have existed!", + del.exists()); del.mkdirs(); - new File(del, FILE).createNewFile(); + new MyFile(del, file1Name).createNewFile(); - // create directory - dir1.mkdirs(); - new File(dir1, FILE).createNewFile(); - changePermissions(false); + // "file1" is non-deletable by default, see MyFile.delete(). + + xSubDir.mkdirs(); + file2.createNewFile(); + xSubDir.setWritable(false); + ySubDir.mkdirs(); + file3.createNewFile(); + + Assert.assertFalse("The directory tmp should not have existed!", + tmp.exists()); + tmp.mkdirs(); + File tmpFile = new File(tmp, FILE); + tmpFile.createNewFile(); + FileUtil.symLink(tmpFile.toString(), zlink.toString()); } - // sets writable permissions for dir1 - private void changePermissions(boolean perm) { - dir1.setWritable(perm); - } - - // validates the return value - // validates the directory:dir1 exists - // sets writable permissions for the directory so that it can be deleted in - // tearDown() + // Validates the return value. + // Validates the existence of directory "xsubdir" and the file "file1" + // Sets writable permissions for the non-deleted dir "xsubdir" so that it can + // be deleted in tearDown(). private void validateAndSetWritablePermissions(boolean ret) { - Assert.assertFalse(ret); - Assert.assertTrue(dir1.exists()); - changePermissions(true); + xSubDir.setWritable(true); + Assert.assertFalse("The return value should have been false!", ret); + Assert.assertTrue("The file file1 should not have been deleted!", + new File(del, file1Name).exists()); + Assert.assertTrue( + "The directory xsubdir should not have been deleted!", + xSubDir.exists()); + Assert.assertTrue("The file file2 should not have been deleted!", + file2.exists()); + Assert.assertFalse("The directory ysubdir should have been deleted!", + ySubDir.exists()); + Assert.assertFalse("The link zlink should have been deleted!", + zlink.exists()); } - + @Test public void testFailFullyDelete() throws IOException { + LOG.info("Running test to verify failure of fullyDelete()"); setupDirsAndNonWritablePermissions(); - boolean ret = FileUtil.fullyDelete(del); + boolean ret = FileUtil.fullyDelete(new MyFile(del)); validateAndSetWritablePermissions(ret); } + /** + * Extend {@link File}. Same as {@link File} except for two things: (1) This + * treats file1Name as a very special file which is not delete-able + * irrespective of it's parent-dir's permissions, a peculiar file instance for + * testing. (2) It returns the files in alphabetically sorted order when + * listed. + * + */ + public static class MyFile extends File { + + private static final long serialVersionUID = 1L; + + public MyFile(File f) { + super(f.getAbsolutePath()); + } + + public MyFile(File parent, String child) { + super(parent, child); + } + + /** + * Same as {@link File#delete()} except for file1Name which will never be + * deleted (hard-coded) + */ + @Override + public boolean delete() { + LOG.info("Trying to delete myFile " + getAbsolutePath()); + boolean bool = false; + if (getName().equals(file1Name)) { + bool = false; + } else { + bool = super.delete(); + } + if (bool) { + LOG.info("Deleted " + getAbsolutePath() + " successfully"); + } else { + LOG.info("Cannot delete " + getAbsolutePath()); + } + return bool; + } + + /** + * Return the list of files in an alphabetically sorted order + */ + @Override + public File[] listFiles() { + File[] files = super.listFiles(); + List filesList = Arrays.asList(files); + Collections.sort(filesList); + File[] myFiles = new MyFile[files.length]; + int i=0; + for(File f : filesList) { + myFiles[i++] = new MyFile(f); + } + return myFiles; + } + } + @Test public void testFailFullyDeleteContents() throws IOException { + LOG.info("Running test to verify failure of fullyDeleteContents()"); setupDirsAndNonWritablePermissions(); - boolean ret = FileUtil.fullyDeleteContents(del); + boolean ret = FileUtil.fullyDeleteContents(new MyFile(del)); validateAndSetWritablePermissions(ret); } }