/**
* 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.hbase.snapshot;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MediumTests;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.master.snapshot.SnapshotManager;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
import org.apache.hadoop.hbase.regionserver.HRegionFileSystem;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.Pair;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
/**
* Test Export Snapshot Tool
*/
@Category(MediumTests.class)
public class TestExportSnapshot {
private final Log LOG = LogFactory.getLog(getClass());
private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
private final static byte[] FAMILY = Bytes.toBytes("cf");
private byte[] emptySnapshotName;
private byte[] snapshotName;
private TableName tableName;
private HBaseAdmin admin;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
TEST_UTIL.getConfiguration().setBoolean(SnapshotManager.HBASE_SNAPSHOT_ENABLED, true);
TEST_UTIL.getConfiguration().setInt("hbase.regionserver.msginterval", 100);
TEST_UTIL.getConfiguration().setInt("hbase.client.pause", 250);
TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 6);
TEST_UTIL.getConfiguration().setBoolean("hbase.master.enabletable.roundrobin", true);
TEST_UTIL.startMiniCluster(3);
TEST_UTIL.startMiniMapReduceCluster();
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
TEST_UTIL.shutdownMiniMapReduceCluster();
TEST_UTIL.shutdownMiniCluster();
}
/**
* Create a table and take a snapshot of the table used by the export test.
*/
@Before
public void setUp() throws Exception {
this.admin = TEST_UTIL.getHBaseAdmin();
long tid = System.currentTimeMillis();
tableName = TableName.valueOf("testtb-" + tid);
snapshotName = Bytes.toBytes("snaptb0-" + tid);
emptySnapshotName = Bytes.toBytes("emptySnaptb0-" + tid);
// create Table
HTableDescriptor htd = new HTableDescriptor(tableName);
htd.addFamily(new HColumnDescriptor(FAMILY));
admin.createTable(htd, null);
// Take an empty snapshot
admin.snapshot(emptySnapshotName, tableName);
// Add some rows
HTable table = new HTable(TEST_UTIL.getConfiguration(), tableName);
TEST_UTIL.loadTable(table, FAMILY);
// take a snapshot
admin.snapshot(snapshotName, tableName);
}
@After
public void tearDown() throws Exception {
TEST_UTIL.deleteTable(tableName);
SnapshotTestingUtils.deleteAllSnapshots(TEST_UTIL.getHBaseAdmin());
SnapshotTestingUtils.deleteArchiveDirectory(TEST_UTIL);
}
/**
* Verfy the result of getBalanceSplits() method.
* The result are groups of files, used as input list for the "export" mappers.
* All the groups should have similar amount of data.
*
* The input list is a pair of file path and length.
* The getBalanceSplits() function sort it by length,
* and assign to each group a file, going back and forth through the groups.
*/
@Test
public void testBalanceSplit() throws Exception {
// Create a list of files
List<Pair<Path, Long>> files = new ArrayList<Pair<Path, Long>>();
for (long i = 0; i <= 20; i++) {
files.add(new Pair<Path, Long>(new Path("file-" + i), i));
}
// Create 5 groups (total size 210)
// group 0: 20, 11, 10, 1 (total size: 42)
// group 1: 19, 12, 9, 2 (total size: 42)
// group 2: 18, 13, 8, 3 (total size: 42)
// group 3: 17, 12, 7, 4 (total size: 42)
// group 4: 16, 11, 6, 5 (total size: 42)
List<List<Path>> splits = ExportSnapshot.getBalancedSplits(files, 5);
assertEquals(5, splits.size());
assertEquals(Arrays.asList(new Path("file-20"), new Path("file-11"),
new Path("file-10"), new Path("file-1"), new Path("file-0")), splits.get(0));
assertEquals(Arrays.asList(new Path("file-19"), new Path("file-12"),
new Path("file-9"), new Path("file-2")), splits.get(1));
assertEquals(Arrays.asList(new Path("file-18"), new Path("file-13"),
new Path("file-8"), new Path("file-3")), splits.get(2));
assertEquals(Arrays.asList(new Path("file-17"), new Path("file-14"),
new Path("file-7"), new Path("file-4")), splits.get(3));
assertEquals(Arrays.asList(new Path("file-16"), new Path("file-15"),
new Path("file-6"), new Path("file-5")), splits.get(4));
}
/**
* Verify if exported snapshot and copied files matches the original one.
*/
@Test
public void testExportFileSystemState() throws Exception {
testExportFileSystemState(tableName, snapshotName, 2);
}
@Test
public void testEmptyExportFileSystemState() throws Exception {
testExportFileSystemState(tableName, emptySnapshotName, 1);
}
/**
* Mock a snapshot with files in the archive dir,
* two regions, and one reference file.
*/
@Test
public void testSnapshotWithRefsExportFileSystemState() throws Exception {
Configuration conf = TEST_UTIL.getConfiguration();
final TableName tableWithRefsName =
TableName.valueOf("tableWithRefs");
final String snapshotName = "tableWithRefs";
final String TEST_FAMILY = Bytes.toString(FAMILY);
final String TEST_HFILE = "abc";
final SnapshotDescription sd = SnapshotDescription.newBuilder()
.setName(snapshotName)
.setTable(tableWithRefsName.getNameAsString()).build();
FileSystem fs = TEST_UTIL.getHBaseCluster().getMaster().getMasterFileSystem().getFileSystem();
Path rootDir = TEST_UTIL.getHBaseCluster().getMaster().getMasterFileSystem().getRootDir();
Path archiveDir = new Path(rootDir, HConstants.HFILE_ARCHIVE_DIRECTORY);
// First region, simple with one plain hfile.
HRegionInfo hri = new HRegionInfo(tableWithRefsName);
HRegionFileSystem r0fs = HRegionFileSystem.createRegionOnFileSystem(conf,
fs, FSUtils.getTableDir(archiveDir, hri.getTable()), hri);
Path storeFile = new Path(rootDir, TEST_HFILE);
FSDataOutputStream out = fs.create(storeFile);
out.write(Bytes.toBytes("Test Data"));
out.close();
r0fs.commitStoreFile(TEST_FAMILY, storeFile);
// Second region, used to test the split case.
// This region contains a reference to the hfile in the first region.
hri = new HRegionInfo(tableWithRefsName);
HRegionFileSystem r1fs = HRegionFileSystem.createRegionOnFileSystem(conf,
fs, new Path(archiveDir, hri.getTable().getNameAsString()), hri);
storeFile = new Path(rootDir, TEST_HFILE + '.' + r0fs.getRegionInfo().getEncodedName());
out = fs.create(storeFile);
out.write(Bytes.toBytes("Test Data"));
out.close();
r1fs.commitStoreFile(TEST_FAMILY, storeFile);
Path tableDir = FSUtils.getTableDir(archiveDir, tableWithRefsName);
Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshotName, rootDir);
FileUtil.copy(fs, tableDir, fs, snapshotDir, false, conf);
SnapshotDescriptionUtils.writeSnapshotInfo(sd, snapshotDir, fs);
testExportFileSystemState(tableWithRefsName, Bytes.toBytes(snapshotName), 2);
}
/**
* Test ExportSnapshot
*/
private void testExportFileSystemState(final TableName tableName, final byte[] snapshotName,
int filesExpected) throws Exception {
Path copyDir = TEST_UTIL.getDataTestDir("export-" + System.currentTimeMillis());
URI hdfsUri = FileSystem.get(TEST_UTIL.getConfiguration()).getUri();
FileSystem fs = FileSystem.get(copyDir.toUri(), new Configuration());
copyDir = copyDir.makeQualified(fs);
// Export Snapshot
int res = ExportSnapshot.innerMain(TEST_UTIL.getConfiguration(), new String[] {
"-snapshot", Bytes.toString(snapshotName),
"-copy-to", copyDir.toString()
});
assertEquals(0, res);
// Verify File-System state
FileStatus[] rootFiles = fs.listStatus(copyDir);
assertEquals(filesExpected, rootFiles.length);
for (FileStatus fileStatus: rootFiles) {
String name = fileStatus.getPath().getName();
assertTrue(fileStatus.isDir());
assertTrue(name.equals(HConstants.SNAPSHOT_DIR_NAME) ||
name.equals(HConstants.HFILE_ARCHIVE_DIRECTORY));
}
// compare the snapshot metadata and verify the hfiles
final FileSystem hdfs = FileSystem.get(hdfsUri, TEST_UTIL.getConfiguration());
final Path snapshotDir = new Path(HConstants.SNAPSHOT_DIR_NAME, Bytes.toString(snapshotName));
verifySnapshot(hdfs, new Path(TEST_UTIL.getDefaultRootDirPath(), snapshotDir),
fs, new Path(copyDir, snapshotDir));
verifyArchive(fs, copyDir, tableName, Bytes.toString(snapshotName));
FSUtils.logFileSystemState(hdfs, snapshotDir, LOG);
// Remove the exported dir
fs.delete(copyDir, true);
}
/*
* verify if the snapshot folder on file-system 1 match the one on file-system 2
*/
private void verifySnapshot(final FileSystem fs1, final Path root1,
final FileSystem fs2, final Path root2) throws IOException {
Set<String> s = new HashSet<String>();
assertEquals(listFiles(fs1, root1, root1), listFiles(fs2, root2, root2));
}
/*
* Verify if the files exists
*/
private void verifyArchive(final FileSystem fs, final Path rootDir,
final TableName tableName, final String snapshotName) throws IOException {
final Path exportedSnapshot = new Path(rootDir,
new Path(HConstants.SNAPSHOT_DIR_NAME, snapshotName));
final Path exportedArchive = new Path(rootDir, HConstants.HFILE_ARCHIVE_DIRECTORY);
LOG.debug(listFiles(fs, exportedArchive, exportedArchive));
SnapshotReferenceUtil.visitReferencedFiles(fs, exportedSnapshot,
new SnapshotReferenceUtil.FileVisitor() {
public void storeFile (final String region, final String family, final String hfile)
throws IOException {
verifyNonEmptyFile(new Path(exportedArchive,
new Path(FSUtils.getTableDir(new Path("./"), tableName),
new Path(region, new Path(family, hfile)))));
}
public void recoveredEdits (final String region, final String logfile)
throws IOException {
verifyNonEmptyFile(new Path(exportedSnapshot,
new Path(tableName.getNameAsString(), new Path(region, logfile))));
}
public void logFile (final String server, final String logfile)
throws IOException {
verifyNonEmptyFile(new Path(exportedSnapshot, new Path(server, logfile)));
}
private void verifyNonEmptyFile(final Path path) throws IOException {
assertTrue(path + " should exists", fs.exists(path));
assertTrue(path + " should not be empty", fs.getFileStatus(path).getLen() > 0);
}
});
}
private Set<String> listFiles(final FileSystem fs, final Path root, final Path dir)
throws IOException {
Set<String> files = new HashSet<String>();
int rootPrefix = root.toString().length();
FileStatus[] list = FSUtils.listStatus(fs, dir);
if (list != null) {
for (FileStatus fstat: list) {
LOG.debug(fstat.getPath());
if (fstat.isDir()) {
files.addAll(listFiles(fs, root, fstat.getPath()));
} else {
files.add(fstat.getPath().toString().substring(rootPrefix));
}
}
}
return files;
}
}