/**
* 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.flume.sink.hdfs;
import com.google.common.base.Charsets;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;
import org.apache.commons.io.FileUtils;
import org.apache.flume.Context;
import org.apache.flume.EventDeliveryException;
import org.apache.flume.channel.MemoryChannel;
import org.apache.flume.event.EventBuilder;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Unit tests that exercise HDFSEventSink on an actual instance of HDFS.
* TODO: figure out how to unit-test Kerberos-secured HDFS.
*/
public class TestHDFSEventSinkOnMiniCluster {
private static final Logger logger =
LoggerFactory.getLogger(TestHDFSEventSinkOnMiniCluster.class);
private static final boolean KEEP_DATA = false;
private static final String DFS_DIR = "target/test/dfs";
private static final String TEST_BUILD_DATA_KEY = "test.build.data";
private static MiniDFSCluster cluster = null;
private static String oldTestBuildDataProp = null;
@BeforeClass
public static void setupClass() throws IOException {
// set up data dir for HDFS
File dfsDir = new File(DFS_DIR);
if (!dfsDir.isDirectory()) {
dfsDir.mkdirs();
}
// save off system prop to restore later
oldTestBuildDataProp = System.getProperty(TEST_BUILD_DATA_KEY);
System.setProperty(TEST_BUILD_DATA_KEY, DFS_DIR);
}
private static String getNameNodeURL(MiniDFSCluster cluster) {
int nnPort = cluster.getNameNode().getNameNodeAddress().getPort();
return "hdfs://localhost:" + nnPort;
}
/**
* This is a very basic test that writes one event to HDFS and reads it back.
*/
@Test
public void simpleHDFSTest() throws EventDeliveryException, IOException {
cluster = new MiniDFSCluster(new Configuration(), 1, true, null);
cluster.waitActive();
String outputDir = "/flume/simpleHDFSTest";
Path outputDirPath = new Path(outputDir);
logger.info("Running test with output dir: {}", outputDir);
FileSystem fs = cluster.getFileSystem();
// ensure output directory is empty
if (fs.exists(outputDirPath)) {
fs.delete(outputDirPath, true);
}
String nnURL = getNameNodeURL(cluster);
logger.info("Namenode address: {}", nnURL);
Context chanCtx = new Context();
MemoryChannel channel = new MemoryChannel();
channel.setName("simpleHDFSTest-mem-chan");
channel.configure(chanCtx);
channel.start();
Context sinkCtx = new Context();
sinkCtx.put("hdfs.path", nnURL + outputDir);
sinkCtx.put("hdfs.fileType", HDFSWriterFactory.DataStreamType);
sinkCtx.put("hdfs.batchSize", Integer.toString(1));
HDFSEventSink sink = new HDFSEventSink();
sink.setName("simpleHDFSTest-hdfs-sink");
sink.configure(sinkCtx);
sink.setChannel(channel);
sink.start();
// create an event
String EVENT_BODY = "yarg!";
channel.getTransaction().begin();
try {
channel.put(EventBuilder.withBody(EVENT_BODY, Charsets.UTF_8));
channel.getTransaction().commit();
} finally {
channel.getTransaction().close();
}
// store event to HDFS
sink.process();
// shut down flume
sink.stop();
channel.stop();
// verify that it's in HDFS and that its content is what we say it should be
FileStatus[] statuses = fs.listStatus(outputDirPath);
Assert.assertNotNull("No files found written to HDFS", statuses);
Assert.assertEquals("Only one file expected", 1, statuses.length);
for (FileStatus status : statuses) {
Path filePath = status.getPath();
logger.info("Found file on DFS: {}", filePath);
FSDataInputStream stream = fs.open(filePath);
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
String line = reader.readLine();
logger.info("First line in file {}: {}", filePath, line);
Assert.assertEquals(EVENT_BODY, line);
}
if (!KEEP_DATA) {
fs.delete(outputDirPath, true);
}
cluster.shutdown();
cluster = null;
}
/**
* Writes two events in GZIP-compressed serialize.
*/
@Test
public void simpleHDFSGZipCompressedTest() throws EventDeliveryException, IOException {
cluster = new MiniDFSCluster(new Configuration(), 1, true, null);
cluster.waitActive();
String outputDir = "/flume/simpleHDFSGZipCompressedTest";
Path outputDirPath = new Path(outputDir);
logger.info("Running test with output dir: {}", outputDir);
FileSystem fs = cluster.getFileSystem();
// ensure output directory is empty
if (fs.exists(outputDirPath)) {
fs.delete(outputDirPath, true);
}
String nnURL = getNameNodeURL(cluster);
logger.info("Namenode address: {}", nnURL);
Context chanCtx = new Context();
MemoryChannel channel = new MemoryChannel();
channel.setName("simpleHDFSTest-mem-chan");
channel.configure(chanCtx);
channel.start();
Context sinkCtx = new Context();
sinkCtx.put("hdfs.path", nnURL + outputDir);
sinkCtx.put("hdfs.fileType", HDFSWriterFactory.CompStreamType);
sinkCtx.put("hdfs.batchSize", Integer.toString(1));
sinkCtx.put("hdfs.codeC", "gzip");
HDFSEventSink sink = new HDFSEventSink();
sink.setName("simpleHDFSTest-hdfs-sink");
sink.configure(sinkCtx);
sink.setChannel(channel);
sink.start();
// create an event
String EVENT_BODY_1 = "yarg1";
String EVENT_BODY_2 = "yarg2";
channel.getTransaction().begin();
try {
channel.put(EventBuilder.withBody(EVENT_BODY_1, Charsets.UTF_8));
channel.put(EventBuilder.withBody(EVENT_BODY_2, Charsets.UTF_8));
channel.getTransaction().commit();
} finally {
channel.getTransaction().close();
}
// store event to HDFS
sink.process();
// shut down flume
sink.stop();
channel.stop();
// verify that it's in HDFS and that its content is what we say it should be
FileStatus[] statuses = fs.listStatus(outputDirPath);
Assert.assertNotNull("No files found written to HDFS", statuses);
Assert.assertEquals("Only one file expected", 1, statuses.length);
for (FileStatus status : statuses) {
Path filePath = status.getPath();
logger.info("Found file on DFS: {}", filePath);
FSDataInputStream stream = fs.open(filePath);
BufferedReader reader = new BufferedReader(new InputStreamReader(
new GZIPInputStream(stream)));
String line = reader.readLine();
logger.info("First line in file {}: {}", filePath, line);
Assert.assertEquals(EVENT_BODY_1, line);
// The rest of this test is commented-out (will fail) for 2 reasons:
//
// (1) At the time of this writing, Hadoop has a bug which causes the
// non-native gzip implementation to create invalid gzip files when
// finish() and resetState() are called. See HADOOP-8522.
//
// (2) Even if HADOOP-8522 is fixed, the JDK GZipInputStream is unable
// to read multi-member (concatenated) gzip files. See this Sun bug:
// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4691425
//
//line = reader.readLine();
//logger.info("Second line in file {}: {}", filePath, line);
//Assert.assertEquals(EVENT_BODY_2, line);
}
if (!KEEP_DATA) {
fs.delete(outputDirPath, true);
}
cluster.shutdown();
cluster = null;
}
/**
* This is a very basic test that writes one event to HDFS and reads it back.
*/
@Test
public void underReplicationTest() throws EventDeliveryException,
IOException {
Configuration conf = new Configuration();
conf.set("dfs.replication", String.valueOf(3));
cluster = new MiniDFSCluster(conf, 3, true, null);
cluster.waitActive();
String outputDir = "/flume/underReplicationTest";
Path outputDirPath = new Path(outputDir);
logger.info("Running test with output dir: {}", outputDir);
FileSystem fs = cluster.getFileSystem();
// ensure output directory is empty
if (fs.exists(outputDirPath)) {
fs.delete(outputDirPath, true);
}
String nnURL = getNameNodeURL(cluster);
logger.info("Namenode address: {}", nnURL);
Context chanCtx = new Context();
MemoryChannel channel = new MemoryChannel();
channel.setName("simpleHDFSTest-mem-chan");
channel.configure(chanCtx);
channel.start();
Context sinkCtx = new Context();
sinkCtx.put("hdfs.path", nnURL + outputDir);
sinkCtx.put("hdfs.fileType", HDFSWriterFactory.DataStreamType);
sinkCtx.put("hdfs.batchSize", Integer.toString(1));
HDFSEventSink sink = new HDFSEventSink();
sink.setName("simpleHDFSTest-hdfs-sink");
sink.configure(sinkCtx);
sink.setChannel(channel);
sink.start();
// create an event
channel.getTransaction().begin();
try {
channel.put(EventBuilder.withBody("yarg 1", Charsets.UTF_8));
channel.put(EventBuilder.withBody("yarg 2", Charsets.UTF_8));
channel.put(EventBuilder.withBody("yarg 3", Charsets.UTF_8));
channel.put(EventBuilder.withBody("yarg 4", Charsets.UTF_8));
channel.put(EventBuilder.withBody("yarg 5", Charsets.UTF_8));
channel.put(EventBuilder.withBody("yarg 5", Charsets.UTF_8));
channel.getTransaction().commit();
} finally {
channel.getTransaction().close();
}
// store events to HDFS
logger.info("Running process(). Create new file.");
sink.process(); // create new file;
logger.info("Running process(). Same file.");
sink.process();
// kill a datanode
logger.info("Killing datanode #1...");
cluster.stopDataNode(0);
// there is a race here.. the client may or may not notice that the
// datanode is dead before it next sync()s.
// so, this next call may or may not roll a new file.
logger.info("Running process(). Create new file? (racy)");
sink.process();
logger.info("Running process(). Create new file.");
sink.process();
logger.info("Running process(). Create new file.");
sink.process();
logger.info("Running process(). Create new file.");
sink.process();
// shut down flume
sink.stop();
channel.stop();
// verify that it's in HDFS and that its content is what we say it should be
FileStatus[] statuses = fs.listStatus(outputDirPath);
Assert.assertNotNull("No files found written to HDFS", statuses);
for (FileStatus status : statuses) {
Path filePath = status.getPath();
logger.info("Found file on DFS: {}", filePath);
FSDataInputStream stream = fs.open(filePath);
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
String line = reader.readLine();
logger.info("First line in file {}: {}", filePath, line);
Assert.assertTrue(line.startsWith("yarg"));
}
Assert.assertTrue("4 or 5 files expected, found " + statuses.length,
statuses.length == 4 || statuses.length == 5);
System.out.println("There are " + statuses.length + " files.");
if (!KEEP_DATA) {
fs.delete(outputDirPath, true);
}
cluster.shutdown();
cluster = null;
}
/**
* This is a very basic test that writes one event to HDFS and reads it back.
*/
@Ignore("This test is flakey and causes tests to fail pretty often.")
@Test
public void maxUnderReplicationTest() throws EventDeliveryException,
IOException {
Configuration conf = new Configuration();
conf.set("dfs.replication", String.valueOf(3));
cluster = new MiniDFSCluster(conf, 3, true, null);
cluster.waitActive();
String outputDir = "/flume/underReplicationTest";
Path outputDirPath = new Path(outputDir);
logger.info("Running test with output dir: {}", outputDir);
FileSystem fs = cluster.getFileSystem();
// ensure output directory is empty
if (fs.exists(outputDirPath)) {
fs.delete(outputDirPath, true);
}
String nnURL = getNameNodeURL(cluster);
logger.info("Namenode address: {}", nnURL);
Context chanCtx = new Context();
MemoryChannel channel = new MemoryChannel();
channel.setName("simpleHDFSTest-mem-chan");
channel.configure(chanCtx);
channel.start();
Context sinkCtx = new Context();
sinkCtx.put("hdfs.path", nnURL + outputDir);
sinkCtx.put("hdfs.fileType", HDFSWriterFactory.DataStreamType);
sinkCtx.put("hdfs.batchSize", Integer.toString(1));
HDFSEventSink sink = new HDFSEventSink();
sink.setName("simpleHDFSTest-hdfs-sink");
sink.configure(sinkCtx);
sink.setChannel(channel);
sink.start();
// create an event
channel.getTransaction().begin();
try {
for (int i = 0; i < 50; i++) {
channel.put(EventBuilder.withBody("yarg " + i, Charsets.UTF_8));
}
channel.getTransaction().commit();
} finally {
channel.getTransaction().close();
}
// store events to HDFS
logger.info("Running process(). Create new file.");
sink.process(); // create new file;
logger.info("Running process(). Same file.");
sink.process();
// kill a datanode
logger.info("Killing datanode #1...");
cluster.stopDataNode(0);
// there is a race here.. the client may or may not notice that the
// datanode is dead before it next sync()s.
// so, this next call may or may not roll a new file.
logger.info("Running process(). Create new file? (racy)");
sink.process();
for (int i = 3; i < 50; i++) {
logger.info("Running process().");
sink.process();
}
// shut down flume
sink.stop();
channel.stop();
// verify that it's in HDFS and that its content is what we say it should be
FileStatus[] statuses = fs.listStatus(outputDirPath);
Assert.assertNotNull("No files found written to HDFS", statuses);
for (FileStatus status : statuses) {
Path filePath = status.getPath();
logger.info("Found file on DFS: {}", filePath);
FSDataInputStream stream = fs.open(filePath);
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
String line = reader.readLine();
logger.info("First line in file {}: {}", filePath, line);
Assert.assertTrue(line.startsWith("yarg"));
}
System.out.println("There are " + statuses.length + " files.");
Assert.assertEquals("31 files expected, found " + statuses.length,
31, statuses.length);
if (!KEEP_DATA) {
fs.delete(outputDirPath, true);
}
cluster.shutdown();
cluster = null;
}
@AfterClass
public static void teardownClass() {
// restore system state, if needed
if (oldTestBuildDataProp != null) {
System.setProperty(TEST_BUILD_DATA_KEY, oldTestBuildDataProp);
}
if (!KEEP_DATA) {
FileUtils.deleteQuietly(new File(DFS_DIR));
}
}
}