/**
* Copyright 2010 The Apache Software Foundation
*
* 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;
import java.io.IOException;
import java.util.List;
import java.util.Random;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.MultithreadedTestUtil.TestContext;
import org.apache.hadoop.hbase.MultithreadedTestUtil.RepeatingTestThread;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Ignore;
import org.junit.Test;
import com.google.common.collect.Lists;
/**
* Test case that uses multiple threads to read and write multifamily rows
* into a table, verifying that reads never see partially-complete writes.
*
* This can run as a junit test, or with a main() function which runs against
* a real cluster (eg for testing with failures, region movement, etc)
*/
public class TestAcidGuarantees {
protected static final Log LOG = LogFactory.getLog(TestAcidGuarantees.class);
public static final byte [] TABLE_NAME = Bytes.toBytes("TestAcidGuarantees");
public static final byte [] FAMILY_A = Bytes.toBytes("A");
public static final byte [] FAMILY_B = Bytes.toBytes("B");
public static final byte [] FAMILY_C = Bytes.toBytes("C");
public static final byte [] QUALIFIER_NAME = Bytes.toBytes("data");
public static final byte[][] FAMILIES = new byte[][] {
FAMILY_A, FAMILY_B, FAMILY_C };
private HBaseTestingUtility util;
public static int NUM_COLS_TO_CHECK = 50;
private void createTableIfMissing()
throws IOException {
try {
util.createTable(TABLE_NAME, FAMILIES);
} catch (TableExistsException tee) {
}
}
public TestAcidGuarantees() {
// Set small flush size for minicluster so we exercise reseeking scanners
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.hregion.memstore.flush.size", String.valueOf(128*1024));
util = new HBaseTestingUtility(conf);
}
/**
* Thread that does random full-row writes into a table.
*/
public static class AtomicityWriter extends RepeatingTestThread {
Random rand = new Random();
byte data[] = new byte[10];
byte targetRows[][];
byte targetFamilies[][];
HTable table;
AtomicLong numWritten = new AtomicLong();
public AtomicityWriter(TestContext ctx, byte targetRows[][],
byte targetFamilies[][]) throws IOException {
super(ctx);
this.targetRows = targetRows;
this.targetFamilies = targetFamilies;
table = new HTable(ctx.getConf(), TABLE_NAME);
}
public void doAnAction() throws Exception {
// Pick a random row to write into
byte[] targetRow = targetRows[rand.nextInt(targetRows.length)];
Put p = new Put(targetRow);
rand.nextBytes(data);
for (byte[] family : targetFamilies) {
for (int i = 0; i < NUM_COLS_TO_CHECK; i++) {
byte qualifier[] = Bytes.toBytes("col" + i);
p.add(family, qualifier, data);
}
}
table.put(p);
numWritten.getAndIncrement();
}
}
/**
* Thread that does single-row reads in a table, looking for partially
* completed rows.
*/
public static class AtomicGetReader extends RepeatingTestThread {
byte targetRow[];
byte targetFamilies[][];
HTable table;
int numVerified = 0;
AtomicLong numRead = new AtomicLong();
public AtomicGetReader(TestContext ctx, byte targetRow[],
byte targetFamilies[][]) throws IOException {
super(ctx);
this.targetRow = targetRow;
this.targetFamilies = targetFamilies;
table = new HTable(ctx.getConf(), TABLE_NAME);
}
public void doAnAction() throws Exception {
Get g = new Get(targetRow);
Result res = table.get(g);
byte[] gotValue = null;
if (res.getRow() == null) {
// Trying to verify but we didn't find the row - the writing
// thread probably just hasn't started writing yet, so we can
// ignore this action
return;
}
for (byte[] family : targetFamilies) {
for (int i = 0; i < NUM_COLS_TO_CHECK; i++) {
byte qualifier[] = Bytes.toBytes("col" + i);
byte thisValue[] = res.getValue(family, qualifier);
if (gotValue != null && !Bytes.equals(gotValue, thisValue)) {
gotFailure(gotValue, res);
}
numVerified++;
gotValue = thisValue;
}
}
numRead.getAndIncrement();
}
private void gotFailure(byte[] expected, Result res) {
StringBuilder msg = new StringBuilder();
msg.append("Failed after ").append(numVerified).append("!");
msg.append("Expected=").append(Bytes.toStringBinary(expected));
msg.append("Got:\n");
for (KeyValue kv : res.list()) {
msg.append(kv.toString());
msg.append(" val= ");
msg.append(Bytes.toStringBinary(kv.getValue()));
msg.append("\n");
}
throw new RuntimeException(msg.toString());
}
}
/**
* Thread that does full scans of the table looking for any partially completed
* rows.
*/
public static class AtomicScanReader extends RepeatingTestThread {
byte targetFamilies[][];
HTable table;
AtomicLong numScans = new AtomicLong();
AtomicLong numRowsScanned = new AtomicLong();
public AtomicScanReader(TestContext ctx,
byte targetFamilies[][]) throws IOException {
super(ctx);
this.targetFamilies = targetFamilies;
table = new HTable(ctx.getConf(), TABLE_NAME);
}
public void doAnAction() throws Exception {
Scan s = new Scan();
for (byte[] family : targetFamilies) {
s.addFamily(family);
}
ResultScanner scanner = table.getScanner(s);
for (Result res : scanner) {
byte[] gotValue = null;
for (byte[] family : targetFamilies) {
for (int i = 0; i < NUM_COLS_TO_CHECK; i++) {
byte qualifier[] = Bytes.toBytes("col" + i);
byte thisValue[] = res.getValue(family, qualifier);
if (gotValue != null && !Bytes.equals(gotValue, thisValue)) {
gotFailure(gotValue, res);
}
gotValue = thisValue;
}
}
numRowsScanned.getAndIncrement();
}
numScans.getAndIncrement();
}
private void gotFailure(byte[] expected, Result res) {
StringBuilder msg = new StringBuilder();
msg.append("Failed after ").append(numRowsScanned).append("!");
msg.append("Expected=").append(Bytes.toStringBinary(expected));
msg.append("Got:\n");
for (KeyValue kv : res.list()) {
msg.append(kv.toString());
msg.append(" val= ");
msg.append(Bytes.toStringBinary(kv.getValue()));
msg.append("\n");
}
throw new RuntimeException(msg.toString());
}
}
public void runTestAtomicity(long millisToRun,
int numWriters,
int numGetters,
int numScanners,
int numUniqueRows) throws Exception {
createTableIfMissing();
TestContext ctx = new TestContext(util.getConfiguration());
byte rows[][] = new byte[numUniqueRows][];
for (int i = 0; i < numUniqueRows; i++) {
rows[i] = Bytes.toBytes("test_row_" + i);
}
List<AtomicityWriter> writers = Lists.newArrayList();
for (int i = 0; i < numWriters; i++) {
AtomicityWriter writer = new AtomicityWriter(
ctx, rows, FAMILIES);
writers.add(writer);
ctx.addThread(writer);
}
List<AtomicGetReader> getters = Lists.newArrayList();
for (int i = 0; i < numGetters; i++) {
AtomicGetReader getter = new AtomicGetReader(
ctx, rows[i % numUniqueRows], FAMILIES);
getters.add(getter);
ctx.addThread(getter);
}
List<AtomicScanReader> scanners = Lists.newArrayList();
for (int i = 0; i < numScanners; i++) {
AtomicScanReader scanner = new AtomicScanReader(ctx, FAMILIES);
scanners.add(scanner);
ctx.addThread(scanner);
}
ctx.startThreads();
ctx.waitFor(millisToRun);
ctx.stop();
LOG.info("Finished test. Writers:");
for (AtomicityWriter writer : writers) {
LOG.info(" wrote " + writer.numWritten.get());
}
LOG.info("Readers:");
for (AtomicGetReader reader : getters) {
LOG.info(" read " + reader.numRead.get());
}
LOG.info("Scanners:");
for (AtomicScanReader scanner : scanners) {
LOG.info(" scanned " + scanner.numScans.get());
LOG.info(" verified " + scanner.numRowsScanned.get() + " rows");
}
}
@Test
@Ignore("Currently not passing - see HBASE-2856")
public void testGetAtomicity() throws Exception {
util.startMiniCluster(1);
try {
runTestAtomicity(20000, 5, 5, 0, 3);
} finally {
util.shutdownMiniCluster();
}
}
@Test
@Ignore("Currently not passing - see HBASE-2670")
public void testScanAtomicity() throws Exception {
util.startMiniCluster(1);
try {
runTestAtomicity(20000, 5, 0, 5, 3);
} finally {
util.shutdownMiniCluster();
}
}
@Test
@Ignore("Currently not passing - see HBASE-2670")
public void testMixedAtomicity() throws Exception {
util.startMiniCluster(1);
try {
runTestAtomicity(20000, 5, 2, 2, 3);
} finally {
util.shutdownMiniCluster();
}
}
public static void main(String args[]) throws Exception {
Configuration c = HBaseConfiguration.create();
TestAcidGuarantees test = new TestAcidGuarantees();
test.setConf(c);
test.runTestAtomicity(5*60*1000, 5, 2, 2, 3);
}
private void setConf(Configuration c) {
util = new HBaseTestingUtility(c);
}
}