/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.flume.agent.diskfailover;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import com.cloudera.flume.agent.durability.NaiveFileWALManager;
import com.cloudera.flume.core.EventSource;
import com.cloudera.flume.handlers.hdfs.SeqfileEventSource;
import com.cloudera.util.Clock;
import com.cloudera.util.FileUtil;
/**
* This tests the write ahead log source against some trouble conditions --
* empty file, truncated file.
*/
public class TestDiskFailoverSource {
public static Logger LOG = Logger.getLogger(TestDiskFailoverSource.class);
// has 5 good entries.
final static String WAL_OK = "src/data/hadoop_logs_5.hdfs";
// this file has been prematurely truncated and is thus corrupt.
final static String WAL_CORRUPT = "src/data/hadoop_logs_5.hdfs.aa";
@Before
public void setUp() {
LOG.info("====================================================");
Logger LOG = Logger.getLogger(NaiveFileFailoverManager.class.getName());
LOG.setLevel(Level.DEBUG);
}
/**
* Seqfile should fail on open when reading an empty file
*/
@Test(expected = IOException.class)
public void testSeqfileErrorOnOpen() throws IOException, InterruptedException {
LOG.info("Exception on open empty file with seqfile");
File tmpdir = FileUtil.mktempdir();
tmpdir.deleteOnExit();
// create empty file.
File corrupt =
new File(tmpdir, "walempty.00000000.20091104-101213997-0800.seq");
LOG.info("corrupt file is named: " + corrupt.getAbsolutePath());
corrupt.createNewFile();
corrupt.deleteOnExit();
// check now, and any age is too old.
File commit = new File(tmpdir, "committed");
commit.deleteOnExit();
EventSource src = new SeqfileEventSource(corrupt.getAbsolutePath());
try {
src.open(); // expect IOException
} catch (IOException e) {
throw e;
} finally {
FileUtil.rmr(tmpdir);
}
}
/**
* WAL should succeed on open even if its internal opens fail. It will block
* on next() while continuing to try get a valid source of events.
*
* This test demonstrates this by starting the WALSource, calling next in a
* separate thread, and waits a little. Nothing should have happened.
*/
@Test
public void testSurviveErrorOnOpen() throws IOException, InterruptedException {
LOG.info("Survive error on open with WALSource");
File basedir = FileUtil.mktempdir();
basedir.deleteOnExit();
// create empty file.
File logDir = new File(basedir, NaiveFileWALManager.LOGGEDDIR);
logDir.mkdirs();
File corrupt =
new File(logDir, "walempty.00000000.20091104-101213997-0800.seq");
LOG.info("corrupt file is named: " + corrupt.getAbsolutePath());
corrupt.createNewFile();
corrupt.deleteOnExit();
DiskFailoverManager dfman = new NaiveFileFailoverManager(basedir);
final DiskFailoverSource src = new DiskFailoverSource(dfman);
// open would normally fail but because this wrapped, this is ok.
src.open();
src.recover();
final AtomicBoolean okstate = new AtomicBoolean(true);
Thread t = new Thread() {
public void run() {
try {
// this should block and never make progress.
src.next();
} catch (IOException e) {
e.printStackTrace();
} finally {
// this should never execute.
okstate.set(false);
}
}
};
t.start();
// TODO (jon) remove sleeps
// yeah, I know you don't like sleeps.. getting into the DirWatcher is more
// trouble than I want right now.
Clock.sleep(3000);
src.close();
assertTrue(okstate.get()); // no unexepcted exns or fall throughs.
FileUtil.rmr(basedir);
}
/**
* In this situation WAL is open and has a file that starts off being ok. It
* should then encounter a file with zero size and fails to open). It should
* continue if there are more data or block if there is not.
*/
@Test
public void testSurviveEmptyFile() throws IOException, InterruptedException {
LOG.info("Survive empty file with walsource");
File basedir = FileUtil.mktempdir();
basedir.deleteOnExit();
// create a few empty files and writing them to the wal/logged dir
File logdir = new File(basedir, NaiveFileFailoverManager.LOGGEDDIR);
logdir.mkdirs();
File emptyfile =
new File(logdir, "walempty.0000000.20091104-101213997-0800.seq");
LOG.info("zero file is named: " + emptyfile.getAbsolutePath());
emptyfile.createNewFile();
emptyfile.deleteOnExit();
// copy an ok file that has exactly 5 entries into the wal/logged dir
File orig = new File(WAL_OK);
File ok = new File(logdir, "ok.0000000.20091104-101213997-0800.seq");
FileUtil.dumbfilecopy(orig, ok);
// check now, and any age is too old.
NaiveFileFailoverManager dfman = new NaiveFileFailoverManager(basedir);
final DiskFailoverSource src = new DiskFailoverSource(dfman);
// inject data using recovery mode
src.open();
src.recover();
final AtomicInteger count = new AtomicInteger();
final AtomicBoolean okstate = new AtomicBoolean(true);
Thread t = new Thread("poller") {
public void run() {
try {
for (int i = 0; i < 10; i++) {
// this eventually blocks and never make progress.
// It will always read the good entries and skip over the bad file.
src.next();
count.getAndIncrement();
}
} catch (IOException e) {
LOG.info("about to fail because of " + e);
e.printStackTrace();
okstate.set(false);
}
}
};
t.start();
// TODO (jon) remove sleeps
// yeah, I know you don't like sleeps.. getting into the DirWatcher is more
// trouble than I want right now.
Clock.sleep(3000);
src.close();
assertTrue(okstate.get()); // no unexpected exceptions
assertEquals(5, count.get());
// After this call okstate will be false because IOExcpetion is thrown on
// close.
FileUtil.rmr(basedir);
}
/**
* In this situation WAL is open and has a file that starts off being ok. It
* should then encounter a file with zero size and fails to open). It should
* continue if there are more data or block if there is not.
*/
@Test
public void testSurviveTwoEmptyFiles() throws IOException,
InterruptedException {
LOG.info("Survive two empty files with walsource");
File basedir = FileUtil.mktempdir();
basedir.deleteOnExit();
// create a few empty files.
File logdir = new File(basedir, NaiveFileFailoverManager.LOGGEDDIR);
logdir.mkdirs();
File emptyfile =
new File(logdir, "walempty.0000000.20091104-101213997-0800.seq");
LOG.info("zero file is named: " + emptyfile.getAbsolutePath());
emptyfile.createNewFile();
emptyfile.deleteOnExit();
File emptyfile2 =
new File(logdir, "walempty2.0000000.20091104-101213997-0800.seq");
LOG.info("zero file is named: " + emptyfile2.getAbsolutePath());
emptyfile2.createNewFile();
emptyfile2.deleteOnExit();
// copy an ok file that has exactly 5 entries
File orig = new File(WAL_OK);
File ok = new File(logdir, "ok.0000000.20091104-101213997-0800.seq");
FileUtil.dumbfilecopy(orig, ok);
// check now, and any age is too old.
// final WriteAheadLogSource src = new WriteAheadLogSource(tmpdir
// .getAbsolutePath(), 0, 0);
NaiveFileFailoverManager walman = new NaiveFileFailoverManager(basedir);
final DiskFailoverSource src = new DiskFailoverSource(walman);
src.open();
src.recover();
final AtomicInteger count = new AtomicInteger();
final AtomicBoolean okstate = new AtomicBoolean(true);
Thread t = new Thread("poller") {
public void run() {
try {
for (int i = 0; i < 10; i++) {
// this eventually blocks and never make progress.
// It will always read the good entries and skip over the bad file.
src.next();
count.getAndIncrement();
}
} catch (IOException e) {
e.printStackTrace();
okstate.set(false);
}
}
};
t.start();
// TODO (jon) remove sleeps
// yeah, I know you don't like sleeps.. getting into the DirWatcher is more
// trouble than I want right now.
Clock.sleep(3000);
src.close();
assertTrue(okstate.get()); // no unexpected exceptions
assertEquals(5, count.get());
// After this call okstate will be false becuase IOExcpetion is thrown on
// close.
FileUtil.rmr(basedir);
}
/**
*In this stuation we intially open a file that starts of ok. However, at
* some point in runs into an unexpected end of file (due to a program /
* machine/ write failure).
*
* We want this to send all entries it can, fire some event with the bad wal
* file, and the continue on with other ok files.
*/
@Test
public void testSurviveCorruptFile() throws IOException, InterruptedException {
LOG.info("Survive zero file with walsource");
File basedir = FileUtil.mktempdir();
basedir.deleteOnExit();
File logdir = new File(basedir, NaiveFileFailoverManager.LOGGEDDIR);
logdir.mkdirs();
// create empty file.
File corrupt =
new File(logdir, "walcorrupt.0000000.20091104-101213997-0800.seq");
LOG.info("corrupt file is named: " + corrupt.getAbsolutePath());
FileUtil.dumbfilecopy(new File(WAL_CORRUPT), corrupt);
corrupt.deleteOnExit();
// check now, and any age is too old.
NaiveFileFailoverManager walman = new NaiveFileFailoverManager(basedir);
final DiskFailoverSource src = new DiskFailoverSource(walman);
src.open();
src.recover();
final AtomicInteger count = new AtomicInteger();
final AtomicBoolean okstate = new AtomicBoolean(true);
Thread t = new Thread() {
public void run() {
try {
for (int i = 0; true; i++) {
// this eventually blocks and never make progress.
// It will always read the good entries and skip over the bad file.
src.next();
count.getAndIncrement();
}
} catch (IOException e) {
e.printStackTrace();
okstate.set(false);
}
}
};
t.start();
// TODO (jon) remove sleeps
// yeah, I know you don't like sleeps.. getting into the DirWatcher is more
// trouble than I want right now.
Clock.sleep(3000);
src.close();
LOG.info("Outputted " + count.get() + " events");
assertTrue(okstate.get()); // no unexpected exceptions
assertEquals(3, count.get());
FileUtil.rmr(basedir);
}
/**
* Make sure we handle/cover error cases
*/
// TODO (jon) this currently causes an infinite loop.Fix this problem
// eventually
@Test
@Ignore
public void testBadDfman() throws IOException {
File dir = FileUtil.mktempdir();
// adding a ridiculous age.
DiskFailoverManager dfman = new NaiveFileFailoverManager(dir) {
@Override
public EventSource getUnsentSource() throws IOException {
return new EventSource.Base() {
public void open() throws IOException {
throw new IOException("Bad");
}
};
}
};
DiskFailoverSource src = new DiskFailoverSource(dfman);
src.open();
assertEquals(null, src.next());
FileUtil.rmr(dir);
}
}