/**
* 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.raid;
import java.io.File;
import java.io.FileWriter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.GregorianCalendar;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Random;
import java.util.zip.CRC32;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.mapred.MiniMRCluster;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.raid.protocol.PolicyInfo;
import org.apache.hadoop.raid.protocol.PolicyList;
/**
* Test the generation of parity blocks for files with different block
* sizes. Also test that a data block can be regenerated from a raid stripe
* using the parity block
*/
public class TestRaidNode extends TestCase {
final static String TEST_DIR = new File(System.getProperty("test.build.data",
"build/contrib/raid/test/data")).getAbsolutePath();
final static String CONFIG_FILE = new File(TEST_DIR,
"test-raid.xml").getAbsolutePath();
final static long RELOAD_INTERVAL = 1000;
final static Log LOG = LogFactory.getLog("org.apache.hadoop.raid.TestRaidNode");
final static Random rand = new Random();
Configuration conf;
String namenode = null;
MiniDFSCluster dfs = null;
FileSystem fileSys = null;
/**
* create mapreduce and dfs clusters
*/
private void createClusters(boolean local) throws Exception {
new File(TEST_DIR).mkdirs(); // Make sure data directory exists
conf = new Configuration();
conf.set("raid.config.file", CONFIG_FILE);
conf.setBoolean("raid.config.reload", true);
conf.setLong("raid.config.reload.interval", RELOAD_INTERVAL);
conf.setBoolean("dfs.permissions.enabled", true);
// scan all policies once every 5 second
conf.setLong("raid.policy.rescan.interval", 5000);
// the RaidNode does the raiding inline (instead of submitting to map/reduce)
conf.setBoolean("fs.raidnode.local", local);
conf.set("raid.server.address", "localhost:0");
// create a dfs and map-reduce cluster
final int taskTrackers = 4;
final int jobTrackerPort = 60050;
dfs = new MiniDFSCluster(conf, 3, true, null);
dfs.waitActive();
fileSys = dfs.getFileSystem();
namenode = fileSys.getUri().toString();
}
/**
* create raid.xml file for RaidNode
*/
private void mySetup(String path, short srcReplication, long targetReplication,
long metaReplication, long stripeLength) throws Exception {
FileWriter fileWriter = new FileWriter(CONFIG_FILE);
fileWriter.write("<?xml version=\"1.0\"?>\n");
String str = "<configuration> " +
"<srcPath prefix=\"" + path + "\"> " +
"<policy name = \"RaidTest1\"> " +
"<destPath> /destraid</destPath> " +
"<property> " +
"<name>srcReplication</name> " +
"<value>" + srcReplication + "</value> " +
"<description> pick only files whole replFactor is greater than or equal to " +
"</description> " +
"</property> " +
"<property> " +
"<name>targetReplication</name> " +
"<value>" + targetReplication + "</value> " +
"<description>after RAIDing, decrease the replication factor of a file to this value." +
"</description> " +
"</property> " +
"<property> " +
"<name>metaReplication</name> " +
"<value>" + metaReplication + "</value> " +
"<description> replication factor of parity file" +
"</description> " +
"</property> " +
"<property> " +
"<name>stripeLength</name> " +
"<value>" + stripeLength + "</value> " +
"<description> the max number of blocks in a file to RAID together " +
"</description> " +
"</property> " +
"<property> " +
"<name>modTimePeriod</name> " +
"<value>2000</value> " +
"<description> time (milliseconds) after a file is modified to make it " +
"a candidate for RAIDing " +
"</description> " +
"</property> " +
"</policy>" +
"</srcPath>" +
"</configuration>";
fileWriter.write(str);
fileWriter.close();
}
/**
* stop clusters created earlier
*/
private void stopClusters() throws Exception {
if (dfs != null) { dfs.shutdown(); }
}
/**
* Test to run a filter
*/
public void testPathFilter() throws Exception {
LOG.info("Test testPathFilter started.");
long blockSizes [] = {1024L};
long stripeLengths [] = {1, 2, 5, 6, 10, 11, 12};
long targetReplication = 1;
long metaReplication = 1;
int numBlock = 11;
int iter = 0;
try {
createClusters(true);
for (long blockSize : blockSizes) {
for (long stripeLength : stripeLengths) {
doTestPathFilter(iter, targetReplication, metaReplication,
stripeLength, blockSize, numBlock);
iter++;
}
}
doCheckPolicy();
} finally {
stopClusters();
}
LOG.info("Test testPathFilter completed.");
}
/**
* Test to run a filter
*/
private void doTestPathFilter(int iter, long targetReplication,
long metaReplication, long stripeLength,
long blockSize, int numBlock) throws Exception {
LOG.info("doTestPathFilter started---------------------------:" + " iter " + iter +
" blockSize=" + blockSize + " stripeLength=" + stripeLength);
mySetup("/user/dhruba/raidtest", (short)1, targetReplication, metaReplication, stripeLength);
RaidShell shell = null;
Path dir = new Path("/user/dhruba/raidtest/");
Path file1 = new Path(dir + "/file" + iter);
RaidNode cnode = null;
try {
Path destPath = new Path("/destraid/user/dhruba/raidtest");
fileSys.delete(dir, true);
fileSys.delete(destPath, true);
long crc1 = createOldFile(fileSys, file1, 1, numBlock, blockSize);
LOG.info("doTestPathFilter created test files for iteration " + iter);
// create an instance of the RaidNode
cnode = RaidNode.createRaidNode(null, conf);
int times = 10;
while (times-- > 0) {
try {
shell = new RaidShell(conf, cnode.getListenerAddress());
} catch (Exception e) {
LOG.info("doTestPathFilter unable to connect to " +
cnode.getListenerAddress() + " retrying....");
Thread.sleep(1000);
continue;
}
break;
}
LOG.info("doTestPathFilter created RaidShell.");
FileStatus[] listPaths = null;
// wait till file is raided
while (true) {
try {
listPaths = fileSys.listStatus(destPath);
int count = 0;
if (listPaths != null && listPaths.length == 1) {
for (FileStatus s : listPaths) {
LOG.info("doTestPathFilter found path " + s.getPath());
if (!s.getPath().toString().endsWith(".tmp")) {
count++;
}
}
}
if (count > 0) {
break;
}
} catch (FileNotFoundException e) {
//ignore
}
LOG.info("doTestPathFilter waiting for files to be raided. Found " +
(listPaths == null ? "none" : listPaths.length));
Thread.sleep(1000); // keep waiting
}
// assertEquals(listPaths.length, 1); // all files raided
LOG.info("doTestPathFilter all files found in Raid.");
// check for error at beginning of file
if (numBlock >= 1) {
LOG.info("Check error at beginning of file.");
simulateError(shell, fileSys, file1, crc1, 0);
}
// check for error at the beginning of second block
if (numBlock >= 2) {
LOG.info("Check error at beginning of second block.");
simulateError(shell, fileSys, file1, crc1, blockSize + 1);
}
// check for error at the middle of third block
if (numBlock >= 3) {
LOG.info("Check error at middle of third block.");
simulateError(shell, fileSys, file1, crc1, 2 * blockSize + 10);
}
// check for error at the middle of second stripe
if (numBlock >= stripeLength + 1) {
LOG.info("Check error at middle of second stripe.");
simulateError(shell, fileSys, file1, crc1,
stripeLength * blockSize + 100);
}
} catch (Exception e) {
LOG.info("doTestPathFilter Exception " + e +
StringUtils.stringifyException(e));
throw e;
} finally {
shell.close();
if (cnode != null) { cnode.stop(); cnode.join(); }
LOG.info("doTestPathFilter delete file " + file1);
fileSys.delete(file1, true);
}
LOG.info("doTestPathFilter completed:" + " blockSize=" + blockSize +
" stripeLength=" + stripeLength);
}
// Check that raid occurs only on files that have a replication factor
// greater than or equal to the specified value
private void doCheckPolicy() throws Exception {
LOG.info("doCheckPolicy started---------------------------:");
short srcReplication = 3;
long targetReplication = 2;
long metaReplication = 1;
long stripeLength = 2;
long blockSize = 1024;
int numBlock = 3;
mySetup("/user/dhruba/policytest", srcReplication, targetReplication, metaReplication, stripeLength);
RaidShell shell = null;
Path dir = new Path("/user/dhruba/policytest/");
Path file1 = new Path(dir + "/file1");
Path file2 = new Path(dir + "/file2");
RaidNode cnode = null;
try {
Path destPath = new Path("/destraid/user/dhruba/policytest");
fileSys.delete(dir, true);
fileSys.delete(destPath, true);
// create an instance of the RaidNode
cnode = RaidNode.createRaidNode(null, conf);
int times = 10;
while (times-- > 0) {
try {
shell = new RaidShell(conf, cnode.getListenerAddress());
} catch (Exception e) {
LOG.info("doCheckPolicy unable to connect to " +
cnode.getListenerAddress() + " retrying....");
Thread.sleep(1000);
continue;
}
break;
}
LOG.info("doCheckPolicy created RaidShell.");
// this file should be picked up RaidNode
long crc2 = createOldFile(fileSys, file2, 2, numBlock, blockSize);
FileStatus[] listPaths = null;
long firstmodtime = 0;
// wait till file is raided
while (true) {
Thread.sleep(20000L); // waiting
listPaths = fileSys.listStatus(destPath);
int count = 0;
if (listPaths != null && listPaths.length == 1) {
for (FileStatus s : listPaths) {
LOG.info("doCheckPolicy found path " + s.getPath());
if (!s.getPath().toString().endsWith(".tmp")) {
count++;
firstmodtime = s.getModificationTime();
}
}
}
if (count > 0) {
break;
}
LOG.info("doCheckPolicy waiting for files to be raided. Found " +
(listPaths == null ? "none" : listPaths.length));
}
assertEquals(listPaths.length, 1);
LOG.info("doCheckPolicy all files found in Raid the first time.");
LOG.info("doCheckPolicy: recreating source file");
crc2 = createOldFile(fileSys, file2, 2, numBlock, blockSize);
FileStatus st = fileSys.getFileStatus(file2);
assertTrue(st.getModificationTime() > firstmodtime);
// wait till file is raided
while (true) {
Thread.sleep(20000L); // waiting
listPaths = fileSys.listStatus(destPath);
int count = 0;
if (listPaths != null && listPaths.length == 1) {
for (FileStatus s : listPaths) {
LOG.info("doCheckPolicy found path " + s.getPath() + " " + s.getModificationTime());
if (!s.getPath().toString().endsWith(".tmp") &&
s.getModificationTime() > firstmodtime) {
count++;
}
}
}
if (count > 0) {
break;
}
LOG.info("doCheckPolicy waiting for files to be raided. Found " +
(listPaths == null ? "none" : listPaths.length));
}
assertEquals(listPaths.length, 1);
LOG.info("doCheckPolicy: file got re-raided as expected.");
} catch (Exception e) {
LOG.info("doCheckPolicy Exception " + e +
StringUtils.stringifyException(e));
throw e;
} finally {
shell.close();
if (cnode != null) { cnode.stop(); cnode.join(); }
LOG.info("doTestPathFilter delete file " + file1);
fileSys.delete(file1, false);
}
LOG.info("doCheckPolicy completed:");
}
/**
* Test dist Raid
*/
public void testDistRaid() throws Exception {
LOG.info("Test testDistRaid started.");
long blockSize = 1024L;
long targetReplication = 2;
long metaReplication = 2;
long stripeLength = 3;
short srcReplication = 1;
try {
createClusters(false);
mySetup("/user/dhruba/raidtest", srcReplication, targetReplication, metaReplication, stripeLength);
LOG.info("Test testDistRaid created test files");
Path dir = new Path("/user/dhruba/raidtest/");
Path destPath = new Path("/destraid/user/dhruba/raidtest");
fileSys.delete(dir, true);
fileSys.delete(destPath, true);
ConfigManager configMgr = new ConfigManager(conf);
configMgr.reloadConfigsIfNecessary();
LOG.info(" testDistRaid ConfigFile Loaded");
// activate all categories
Collection<PolicyList> all = configMgr.getAllPolicies();
PolicyList[] sorted = all.toArray(new PolicyList[all.size()]);
Iterator<PolicyInfo> pi = sorted[0].getAll().iterator();
PolicyInfo p = pi.next();
List<FileStatus> ll = new ArrayList<FileStatus>();
for(int i = 0 ; i < 10; i++){
Path file = new Path("/user/dhruba/raidtest/file"+i);
createOldFile(fileSys, file, 1, 7, blockSize);
FileStatus st = fileSys.getFileStatus(file);
ll.add(st);
}
DistRaid dr = new DistRaid(conf);
dr.addRaidPaths(p, ll);
dr.doDistRaid();
LOG.info("Test testDistRaid successful.");
} catch (Exception e) {
LOG.info("testDistRaid Exception " + e + StringUtils.stringifyException(e));
throw e;
} finally {
stopClusters();
}
LOG.info("Test testDistRaid completed.");
}
//
// simulate a corruption at specified offset and verify that eveyrthing is good
//
void simulateError(RaidShell shell, FileSystem fileSys, Path file1,
long crc, long corruptOffset) throws IOException {
// recover the file assuming that we encountered a corruption at offset 0
String[] args = new String[3];
args[0] = "recover";
args[1] = file1.toString();
args[2] = Long.toString(corruptOffset);
Path recover1 = shell.recover(args[0], args, 1)[0];
// compare that the recovered file is identical to the original one
LOG.info("Comparing file " + file1 + " with recovered file " + recover1);
validateFile(fileSys, file1, recover1, crc);
fileSys.delete(recover1, false);
}
//
// creates a file and populate it with random data. Returns its crc.
//
static long createOldFile(FileSystem fileSys, Path name, int repl, int numBlocks, long blocksize)
throws IOException {
CRC32 crc = new CRC32();
FSDataOutputStream stm = fileSys.create(name, true,
fileSys.getConf().getInt("io.file.buffer.size", 4096),
(short)repl, blocksize);
// fill random data into file
byte[] b = new byte[(int)blocksize];
for (int i = 0; i < numBlocks; i++) {
if (i == (numBlocks-1)) {
b = new byte[(int)blocksize/2];
}
rand.nextBytes(b);
stm.write(b);
crc.update(b);
}
stm.close();
return crc.getValue();
}
//
// validates that file matches the crc.
//
private void validateFile(FileSystem fileSys, Path name1, Path name2, long crc)
throws IOException {
FileStatus stat1 = fileSys.getFileStatus(name1);
FileStatus stat2 = fileSys.getFileStatus(name2);
assertTrue(" Length of file " + name1 + " is " + stat1.getLen() +
" is different from length of file " + name1 + " " + stat2.getLen(),
stat1.getLen() == stat2.getLen());
CRC32 newcrc = new CRC32();
FSDataInputStream stm = fileSys.open(name2);
final byte[] b = new byte[4192];
int num = 0;
while (num >= 0) {
num = stm.read(b);
if (num < 0) {
break;
}
newcrc.update(b, 0, num);
}
stm.close();
if (newcrc.getValue() != crc) {
fail("CRC mismatch of files " + name1 + " with file " + name2);
}
}
}