/*
* 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.regionserver;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FilterFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PositionedReadable;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.io.hfile.HFileScanner;
import org.apache.hadoop.hbase.regionserver.StoreFile.BloomType;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
/**
* Test cases that ensure that file system level errors are bubbled up
* appropriately to clients, rather than swallowed.
*/
public class TestFSErrorsExposed {
private static final Log LOG = LogFactory.getLog(TestFSErrorsExposed.class);
HBaseTestingUtility util = new HBaseTestingUtility();
/**
* Injects errors into the pread calls of an on-disk file, and makes
* sure those bubble up to the HFile scanner
*/
@Test
public void testHFileScannerThrowsErrors() throws IOException {
Path hfilePath = new Path(new Path(
HBaseTestingUtility.getTestDir("internalScannerExposesErrors"),
"regionname"), "familyname");
FaultyFileSystem fs = new FaultyFileSystem(util.getTestFileSystem());
StoreFile.Writer writer = StoreFile.createWriter(fs, hfilePath, 2*1024);
TestStoreFile.writeStoreFile(
writer, Bytes.toBytes("cf"), Bytes.toBytes("qual"));
StoreFile sf = new StoreFile(fs, writer.getPath(), false,
util.getConfiguration(), StoreFile.BloomType.NONE, false);
StoreFile.Reader reader = sf.createReader();
HFileScanner scanner = reader.getScanner(false, true);
FaultyInputStream inStream = fs.inStreams.get(0).get();
assertNotNull(inStream);
scanner.seekTo();
// Do at least one successful read
assertTrue(scanner.next());
inStream.startFaults();
try {
int scanned=0;
while (scanner.next()) {
scanned++;
}
fail("Scanner didn't throw after faults injected");
} catch (IOException ioe) {
LOG.info("Got expected exception", ioe);
assertTrue(ioe.getMessage().contains("Fault"));
}
reader.close();
}
/**
* Injects errors into the pread calls of an on-disk file, and makes
* sure those bubble up to the StoreFileScanner
*/
@Test
public void testStoreFileScannerThrowsErrors() throws IOException {
Path hfilePath = new Path(new Path(
HBaseTestingUtility.getTestDir("internalScannerExposesErrors"),
"regionname"), "familyname");
FaultyFileSystem fs = new FaultyFileSystem(util.getTestFileSystem());
StoreFile.Writer writer = StoreFile.createWriter(fs, hfilePath, 2 * 1024);
TestStoreFile.writeStoreFile(
writer, Bytes.toBytes("cf"), Bytes.toBytes("qual"));
StoreFile sf = new StoreFile(fs, writer.getPath(), false,
util.getConfiguration(), BloomType.NONE, false);
List<StoreFileScanner> scanners = StoreFileScanner.getScannersForStoreFiles(
Collections.singletonList(sf), false, true);
KeyValueScanner scanner = scanners.get(0);
FaultyInputStream inStream = fs.inStreams.get(0).get();
assertNotNull(inStream);
scanner.seek(KeyValue.LOWESTKEY);
// Do at least one successful read
assertNotNull(scanner.next());
inStream.startFaults();
try {
int scanned=0;
while (scanner.next() != null) {
scanned++;
}
fail("Scanner didn't throw after faults injected");
} catch (IOException ioe) {
LOG.info("Got expected exception", ioe);
assertTrue(ioe.getMessage().contains("Could not iterate"));
}
scanner.close();
}
/**
* Cluster test which starts a region server with a region, then
* removes the data from HDFS underneath it, and ensures that
* errors are bubbled to the client.
*/
@Test
public void testFullSystemBubblesFSErrors() throws Exception {
try {
// We set it not to run or it will trigger server shutdown while sync'ing
// because all the datanodes are bad
util.getConfiguration().setInt(
"hbase.regionserver.optionallogflushinterval", Integer.MAX_VALUE);
util.startMiniCluster(1);
byte[] tableName = Bytes.toBytes("table");
byte[] fam = Bytes.toBytes("fam");
HBaseAdmin admin = new HBaseAdmin(util.getConfiguration());
HTableDescriptor desc = new HTableDescriptor(tableName);
desc.addFamily(new HColumnDescriptor(
fam, 1, HColumnDescriptor.DEFAULT_COMPRESSION,
false, false, HConstants.FOREVER, "NONE"));
admin.createTable(desc);
// Make it fail faster.
util.getConfiguration().setInt("hbase.client.retries.number", 1);
// Make a new Configuration so it makes a new connection that has the
// above configuration on it; else we use the old one w/ 10 as default.
HTable table = new HTable(new Configuration(util.getConfiguration()), tableName);
// Load some data
util.loadTable(table, fam);
table.flushCommits();
util.flush();
util.countRows(table);
// Kill the DFS cluster
util.getDFSCluster().shutdownDataNodes();
try {
util.countRows(table);
fail("Did not fail to count after removing data");
} catch (Exception e) {
LOG.info("Got expected error", e);
assertTrue(e.getMessage().contains("Could not seek"));
}
} finally {
util.shutdownMiniCluster();
}
}
static class FaultyFileSystem extends FilterFileSystem {
List<SoftReference<FaultyInputStream>> inStreams =
new ArrayList<SoftReference<FaultyInputStream>>();
public FaultyFileSystem(FileSystem testFileSystem) {
super(testFileSystem);
}
@Override
public FSDataInputStream open(Path p, int bufferSize) throws IOException {
FSDataInputStream orig = fs.open(p, bufferSize);
FaultyInputStream faulty = new FaultyInputStream(orig);
inStreams.add(new SoftReference<FaultyInputStream>(faulty));
return faulty;
}
}
static class FaultyInputStream extends FSDataInputStream {
boolean faultsStarted = false;
public FaultyInputStream(InputStream in) throws IOException {
super(in);
}
public void startFaults() {
faultsStarted = true;
}
public int read(long position, byte[] buffer, int offset, int length)
throws IOException {
injectFault();
return ((PositionedReadable)in).read(position, buffer, offset, length);
}
private void injectFault() throws IOException {
if (faultsStarted) {
throw new IOException("Fault injected");
}
}
}
}