GC: Remove empty references folders
After packaging references, the folders containing these references are not deleted. In a busy repository, this causes operations to slow down as traversing the references tree becomes longer. Delete empty reference folders after the loose references have been packed. To avoid deleting a folder that was just created by another concurrent operation, only delete folders that were not modified in the last 30 seconds. Signed-off-by: Hector Oswaldo Caballero <hector.caballero@ericsson.com> Change-Id: Ie79447d6121271cf5e25171be377ea396c7028e0 Signed-off-by: Luca Milanesio <luca.milanesio@gmail.com> Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
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/*
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* Copyright (C) 2018 Ericsson
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.internal.storage.file;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.attribute.FileTime;
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import java.time.Instant;
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import org.junit.Before;
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import org.junit.Test;
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public class GcDeleteEmptyRefsFoldersTest extends GcTestCase {
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private static final String REF_FOLDER_01 = "01";
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private static final String REF_FOLDER_02 = "02";
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private Path refsDir;
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private Path heads;
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@Override
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@Before
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public void setUp() throws Exception {
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super.setUp();
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refsDir = Paths.get(repo.getDirectory().getAbsolutePath())
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.resolve("refs");
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heads = refsDir.resolve("heads");
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}
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@Test
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public void emptyRefFoldersAreDeleted() throws Exception {
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FileTime fileTime = FileTime.from(Instant.now().minusSeconds(31));
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Path refDir01 = Files.createDirectory(heads.resolve(REF_FOLDER_01));
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Path refDir02 = Files.createDirectory(heads.resolve(REF_FOLDER_02));
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Files.setLastModifiedTime(refDir01, fileTime);
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Files.setLastModifiedTime(refDir02, fileTime);
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assertTrue(refDir01.toFile().exists());
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assertTrue(refDir02.toFile().exists());
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gc.gc();
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assertFalse(refDir01.toFile().exists());
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assertFalse(refDir02.toFile().exists());
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}
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@Test
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public void emptyRefFoldersAreKeptIfTheyAreTooRecent()
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throws Exception {
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Path refDir01 = Files.createDirectory(heads.resolve(REF_FOLDER_01));
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Path refDir02 = Files.createDirectory(heads.resolve(REF_FOLDER_02));
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assertTrue(refDir01.toFile().exists());
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assertTrue(refDir02.toFile().exists());
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gc.gc();
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assertTrue(refDir01.toFile().exists());
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assertTrue(refDir02.toFile().exists());
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}
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@Test
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public void nonEmptyRefsFoldersAreKept() throws Exception {
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Path refDir01 = Files.createDirectory(heads.resolve(REF_FOLDER_01));
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Path refDir02 = Files.createDirectory(heads.resolve(REF_FOLDER_02));
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Path ref01 = Files.createFile(refDir01.resolve("ref01"));
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Path ref02 = Files.createFile(refDir01.resolve("ref02"));
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assertTrue(refDir01.toFile().exists());
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assertTrue(refDir02.toFile().exists());
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assertTrue(ref01.toFile().exists());
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assertTrue(ref02.toFile().exists());
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gc.gc();
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assertTrue(refDir01.toFile().exists());
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assertTrue(refDir02.toFile().exists());
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assertTrue(ref01.toFile().exists());
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assertTrue(ref02.toFile().exists());
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}
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}
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@ -61,6 +61,8 @@
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import java.nio.file.StandardCopyOption;
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import java.text.MessageFormat;
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import java.text.ParseException;
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import java.time.Instant;
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import java.time.temporal.ChronoUnit;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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@ -865,6 +867,7 @@ else if (RefTreeNames.isRefTree(refdb, ref.getName()))
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throw new IOException(e);
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}
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prunePacked();
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deleteEmptyRefsFolders();
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deleteOrphans();
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lastPackedRefs = refsBefore;
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@ -880,6 +883,49 @@ private static boolean isTag(Ref ref) {
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return ref.getName().startsWith(Constants.R_TAGS);
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}
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private void deleteEmptyRefsFolders() throws IOException {
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Path refs = repo.getDirectory().toPath().resolve("refs"); //$NON-NLS-1$
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try (Stream<Path> entries = Files.list(refs)) {
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Iterator<Path> iterator = entries.iterator();
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while (iterator.hasNext()) {
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try (Stream<Path> s = Files.list(iterator.next())) {
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s.forEach(this::deleteDir);
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}
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}
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}
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}
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private void deleteDir(Path dir) {
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try (Stream<Path> dirs = Files.walk(dir)) {
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dirs.filter(this::isDirectory).sorted(Comparator.reverseOrder())
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.forEach(this::delete);
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} catch (IOException e) {
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LOG.error(e.getMessage(), e);
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}
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}
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private boolean isDirectory(Path p) {
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return p.toFile().isDirectory();
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}
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private boolean delete(Path d) {
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try {
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// Avoid deleting a folder that was just created so that concurrent
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// operations trying to create a reference are not impacted
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Instant threshold = Instant.now().minus(30, ChronoUnit.SECONDS);
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Instant lastModified = Files.getLastModifiedTime(d).toInstant();
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if (lastModified.isBefore(threshold)) {
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// If the folder is not empty, the delete operation will fail
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// silently. This is a cheaper alternative to filtering the
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// stream in the calling method.
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return d.toFile().delete();
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}
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} catch (IOException e) {
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LOG.error(e.getMessage(), e);
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}
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return false;
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}
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/**
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* Deletes orphans
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* <p>
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