HDFS-12976. [SBN read] Introduce ObserverReadProxyProvider. Contributed by Chao Sun.
This commit is contained in:
Chao Sun
Chen Liang
parent
405f6b6fbf
commit
9840dae72f
|
|
@ -448,4 +448,9 @@ public class RetryInvocationHandler<T> implements RpcInvocationHandler {
|
||||||
public ConnectionId getConnectionId() {
|
public ConnectionId getConnectionId() {
|
||||||
return RPC.getConnectionIdForProxy(proxyDescriptor.getProxy());
|
return RPC.getConnectionIdForProxy(proxyDescriptor.getProxy());
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@VisibleForTesting
|
||||||
|
public FailoverProxyProvider<T> getProxyProvider() {
|
||||||
|
return proxyDescriptor.fpp;
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
|
||||||
|
|
@ -34,7 +34,7 @@ import java.util.concurrent.atomic.LongAccumulator;
|
||||||
*/
|
*/
|
||||||
@InterfaceAudience.Private
|
@InterfaceAudience.Private
|
||||||
@InterfaceStability.Stable
|
@InterfaceStability.Stable
|
||||||
class ClientGSIContext implements AlignmentContext {
|
public class ClientGSIContext implements AlignmentContext {
|
||||||
|
|
||||||
private final LongAccumulator lastSeenStateId =
|
private final LongAccumulator lastSeenStateId =
|
||||||
new LongAccumulator(Math::max, Long.MIN_VALUE);
|
new LongAccumulator(Math::max, Long.MIN_VALUE);
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,273 @@
|
||||||
|
/**
|
||||||
|
* 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
|
||||||
|
* <p>
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
* <p>
|
||||||
|
* 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.hdfs.server.namenode.ha;
|
||||||
|
|
||||||
|
import java.io.IOException;
|
||||||
|
import java.lang.reflect.InvocationHandler;
|
||||||
|
import java.lang.reflect.Method;
|
||||||
|
import java.lang.reflect.Proxy;
|
||||||
|
import java.net.URI;
|
||||||
|
import java.util.ArrayList;
|
||||||
|
import java.util.Collections;
|
||||||
|
import java.util.List;
|
||||||
|
|
||||||
|
import org.apache.hadoop.conf.Configuration;
|
||||||
|
import org.apache.hadoop.fs.permission.FsAction;
|
||||||
|
import org.apache.hadoop.hdfs.ClientGSIContext;
|
||||||
|
import org.apache.hadoop.hdfs.NameNodeProxiesClient;
|
||||||
|
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
|
||||||
|
|
||||||
|
import com.google.common.annotations.VisibleForTesting;
|
||||||
|
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
|
||||||
|
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
|
||||||
|
import org.apache.hadoop.ipc.AlignmentContext;
|
||||||
|
import org.apache.hadoop.ipc.RemoteException;
|
||||||
|
import org.apache.hadoop.ipc.StandbyException;
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* A {@link org.apache.hadoop.io.retry.FailoverProxyProvider} implementation
|
||||||
|
* that supports reading from observer namenode(s).
|
||||||
|
*
|
||||||
|
* This constructs a wrapper proxy that sends the request to observer
|
||||||
|
* namenode(s), if observer read is enabled. In case there are multiple
|
||||||
|
* observer namenodes, it will try them one by one in case the RPC failed. It
|
||||||
|
* will fail back to the active namenode after it has exhausted all the
|
||||||
|
* observer namenodes.
|
||||||
|
*
|
||||||
|
* Read and write requests will still be sent to active NN if reading from
|
||||||
|
* observer is turned off.
|
||||||
|
*/
|
||||||
|
public class ObserverReadProxyProvider<T extends ClientProtocol>
|
||||||
|
extends ConfiguredFailoverProxyProvider<T> {
|
||||||
|
private static final Logger LOG = LoggerFactory.getLogger(
|
||||||
|
ObserverReadProxyProvider.class);
|
||||||
|
|
||||||
|
/** Client-side context for syncing with the NameNode server side */
|
||||||
|
private AlignmentContext alignmentContext;
|
||||||
|
|
||||||
|
/** Proxies for the observer namenodes */
|
||||||
|
private final List<AddressRpcProxyPair<T>> observerProxies =
|
||||||
|
new ArrayList<>();
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Whether reading from observer is enabled. If this is false, all read
|
||||||
|
* requests will still go to active NN.
|
||||||
|
*/
|
||||||
|
private boolean observerReadEnabled;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Thread-local index to record the current index in the observer list.
|
||||||
|
*/
|
||||||
|
private static final ThreadLocal<Integer> currentIndex =
|
||||||
|
ThreadLocal.withInitial(() -> 0);
|
||||||
|
|
||||||
|
/** The last proxy that has been used. Only used for testing */
|
||||||
|
private volatile ProxyInfo<T> lastProxy = null;
|
||||||
|
|
||||||
|
@SuppressWarnings("unchecked")
|
||||||
|
public ObserverReadProxyProvider(
|
||||||
|
Configuration conf, URI uri, Class<T> xface, HAProxyFactory<T> factory)
|
||||||
|
throws IOException {
|
||||||
|
super(conf, uri, xface, factory);
|
||||||
|
alignmentContext = new ClientGSIContext();
|
||||||
|
((ClientHAProxyFactory<T>) factory).setAlignmentContext(alignmentContext);
|
||||||
|
|
||||||
|
// Find out all the observer proxies
|
||||||
|
for (AddressRpcProxyPair<T> ap : this.proxies) {
|
||||||
|
ap.namenode = (T) NameNodeProxiesClient.createProxyWithAlignmentContext(
|
||||||
|
ap.address, conf, ugi, false, getFallbackToSimpleAuth(),
|
||||||
|
alignmentContext);
|
||||||
|
if (isObserverState(ap)) {
|
||||||
|
observerProxies.add(ap);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (observerProxies.isEmpty()) {
|
||||||
|
throw new RuntimeException("Couldn't find any namenode proxy in " +
|
||||||
|
"OBSERVER state");
|
||||||
|
}
|
||||||
|
|
||||||
|
// Randomize the list to prevent all clients pointing to the same one
|
||||||
|
boolean randomized = conf.getBoolean(
|
||||||
|
HdfsClientConfigKeys.Failover.RANDOM_ORDER,
|
||||||
|
HdfsClientConfigKeys.Failover.RANDOM_ORDER_DEFAULT);
|
||||||
|
if (randomized) {
|
||||||
|
Collections.shuffle(observerProxies);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public synchronized AlignmentContext getAlignmentContext() {
|
||||||
|
return alignmentContext;
|
||||||
|
}
|
||||||
|
|
||||||
|
@SuppressWarnings("unchecked")
|
||||||
|
@Override
|
||||||
|
public synchronized ProxyInfo<T> getProxy() {
|
||||||
|
// We just create a wrapped proxy containing all the proxies
|
||||||
|
List<ProxyInfo<T>> observerProxies = new ArrayList<>();
|
||||||
|
StringBuilder combinedInfo = new StringBuilder("[");
|
||||||
|
|
||||||
|
for (int i = 0; i < this.observerProxies.size(); i++) {
|
||||||
|
if (i > 0) {
|
||||||
|
combinedInfo.append(",");
|
||||||
|
}
|
||||||
|
AddressRpcProxyPair<T> p = this.observerProxies.get(i);
|
||||||
|
ProxyInfo<T> pInfo = getProxy(p);
|
||||||
|
observerProxies.add(pInfo);
|
||||||
|
combinedInfo.append(pInfo.proxyInfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
combinedInfo.append(']');
|
||||||
|
T wrappedProxy = (T) Proxy.newProxyInstance(
|
||||||
|
ObserverReadInvocationHandler.class.getClassLoader(),
|
||||||
|
new Class<?>[]{xface},
|
||||||
|
new ObserverReadInvocationHandler(observerProxies));
|
||||||
|
return new ProxyInfo<>(wrappedProxy, combinedInfo.toString());
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Check if a method is read-only.
|
||||||
|
*
|
||||||
|
* @return whether the 'method' is a read-only operation.
|
||||||
|
*/
|
||||||
|
private boolean isRead(Method method) {
|
||||||
|
return method.isAnnotationPresent(ReadOnly.class);
|
||||||
|
}
|
||||||
|
|
||||||
|
@VisibleForTesting
|
||||||
|
void setObserverReadEnabled(boolean flag) {
|
||||||
|
this.observerReadEnabled = flag;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* After getting exception 'ex', whether we should retry the current request
|
||||||
|
* on a different observer.
|
||||||
|
*/
|
||||||
|
private boolean shouldRetry(Exception ex) throws Exception {
|
||||||
|
// TODO: implement retry policy
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
@VisibleForTesting
|
||||||
|
ProxyInfo<T> getLastProxy() {
|
||||||
|
return lastProxy;
|
||||||
|
}
|
||||||
|
|
||||||
|
boolean isObserverState(AddressRpcProxyPair<T> ap) {
|
||||||
|
// TODO: should introduce new ClientProtocol method to verify the
|
||||||
|
// underlying service state, which does not require superuser access
|
||||||
|
// The is a workaround
|
||||||
|
IOException ioe = null;
|
||||||
|
try {
|
||||||
|
// Verify write access first
|
||||||
|
ap.namenode.reportBadBlocks(new LocatedBlock[0]);
|
||||||
|
return false; // Only active NameNode allows write
|
||||||
|
} catch (RemoteException re) {
|
||||||
|
IOException sbe = re.unwrapRemoteException(StandbyException.class);
|
||||||
|
if (!(sbe instanceof StandbyException)) {
|
||||||
|
ioe = re;
|
||||||
|
}
|
||||||
|
} catch (IOException e) {
|
||||||
|
ioe = e;
|
||||||
|
}
|
||||||
|
if (ioe != null) {
|
||||||
|
LOG.error("Failed to connect to {}", ap.address, ioe);
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
// Verify read access
|
||||||
|
// For now we assume only Observer nodes allow reads
|
||||||
|
// Stale reads on StandbyNode should be turned off
|
||||||
|
try {
|
||||||
|
ap.namenode.checkAccess("/", FsAction.READ);
|
||||||
|
return true;
|
||||||
|
} catch (RemoteException re) {
|
||||||
|
IOException sbe = re.unwrapRemoteException(StandbyException.class);
|
||||||
|
if (!(sbe instanceof StandbyException)) {
|
||||||
|
ioe = re;
|
||||||
|
}
|
||||||
|
} catch (IOException e) {
|
||||||
|
ioe = e;
|
||||||
|
}
|
||||||
|
if (ioe != null) {
|
||||||
|
LOG.error("Failed to connect to {}", ap.address, ioe);
|
||||||
|
}
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
class ObserverReadInvocationHandler implements InvocationHandler {
|
||||||
|
final List<ProxyInfo<T>> observerProxies;
|
||||||
|
final ProxyInfo<T> activeProxy;
|
||||||
|
|
||||||
|
ObserverReadInvocationHandler(List<ProxyInfo<T>> observerProxies) {
|
||||||
|
this.observerProxies = observerProxies;
|
||||||
|
this.activeProxy = ObserverReadProxyProvider.super.getProxy();
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Sends read operations to the observer (if enabled) specified by the
|
||||||
|
* current index, and send write operations to the active. If a observer
|
||||||
|
* fails, we increment the index and retry the next one. If all observers
|
||||||
|
* fail, the request is forwarded to the active.
|
||||||
|
*
|
||||||
|
* Write requests are always forwarded to the active.
|
||||||
|
*/
|
||||||
|
@Override
|
||||||
|
public Object invoke(Object proxy, final Method method, final Object[] args)
|
||||||
|
throws Throwable {
|
||||||
|
lastProxy = null;
|
||||||
|
Object retVal;
|
||||||
|
|
||||||
|
if (observerReadEnabled && isRead(method)) {
|
||||||
|
// Loop through all the proxies, starting from the current index.
|
||||||
|
for (int i = 0; i < observerProxies.size(); i++) {
|
||||||
|
ProxyInfo<T> current = observerProxies.get(currentIndex.get());
|
||||||
|
try {
|
||||||
|
retVal = method.invoke(current.proxy, args);
|
||||||
|
lastProxy = current;
|
||||||
|
return retVal;
|
||||||
|
} catch (Exception e) {
|
||||||
|
if (!shouldRetry(e)) {
|
||||||
|
throw e;
|
||||||
|
}
|
||||||
|
currentIndex.set((currentIndex.get() + 1) % observerProxies.size());
|
||||||
|
LOG.warn("Invocation returned exception on [{}]",
|
||||||
|
current.proxyInfo, e.getCause());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// If we get here, it means all observers have failed.
|
||||||
|
LOG.warn("All observers have failed for read request {}. " +
|
||||||
|
"Fall back on active: {}", method.getName(), activeProxy);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Either all observers have failed, or that it is a write request.
|
||||||
|
// In either case, we'll forward the request to active NameNode.
|
||||||
|
try {
|
||||||
|
retVal = method.invoke(activeProxy.proxy, args);
|
||||||
|
} catch (Exception e) {
|
||||||
|
throw e.getCause();
|
||||||
|
}
|
||||||
|
lastProxy = activeProxy;
|
||||||
|
return retVal;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -2586,6 +2586,12 @@ public class MiniDFSCluster implements AutoCloseable {
|
||||||
getNameNode(nnIndex).getRpcServer().transitionToStandby(
|
getNameNode(nnIndex).getRpcServer().transitionToStandby(
|
||||||
new StateChangeRequestInfo(RequestSource.REQUEST_BY_USER_FORCED));
|
new StateChangeRequestInfo(RequestSource.REQUEST_BY_USER_FORCED));
|
||||||
}
|
}
|
||||||
|
|
||||||
|
public void transitionToObserver(int nnIndex) throws IOException,
|
||||||
|
ServiceFailedException {
|
||||||
|
getNameNode(nnIndex).getRpcServer().transitionToObserver(
|
||||||
|
new StateChangeRequestInfo(RequestSource.REQUEST_BY_USER_FORCED));
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
public void triggerBlockReports()
|
public void triggerBlockReports()
|
||||||
|
|
|
||||||
|
|
@ -90,7 +90,7 @@ public class TestStateAlignmentContextWithHA {
|
||||||
// Create and set AlignmentContext in HAProxyFactory.
|
// Create and set AlignmentContext in HAProxyFactory.
|
||||||
// All proxies by factory will now have AlignmentContext assigned.
|
// All proxies by factory will now have AlignmentContext assigned.
|
||||||
this.alignmentContext = (spy != null ? spy : new ClientGSIContext());
|
this.alignmentContext = (spy != null ? spy : new ClientGSIContext());
|
||||||
((ClientHAProxyFactory) factory).setAlignmentContext(alignmentContext);
|
((ClientHAProxyFactory<T>) factory).setAlignmentContext(alignmentContext);
|
||||||
|
|
||||||
AC_LIST.add(alignmentContext);
|
AC_LIST.add(alignmentContext);
|
||||||
}
|
}
|
||||||
|
|
|
||||||
|
|
@ -159,6 +159,18 @@ public abstract class HATestUtil {
|
||||||
return (DistributedFileSystem)fs;
|
return (DistributedFileSystem)fs;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
public static DistributedFileSystem configureObserverReadFs(
|
||||||
|
MiniDFSCluster cluster, Configuration conf,
|
||||||
|
int nsIndex) throws IOException, URISyntaxException {
|
||||||
|
conf = new Configuration(conf);
|
||||||
|
String logicalName = getLogicalHostname(cluster);
|
||||||
|
setFailoverConfigurations(cluster, conf, logicalName, nsIndex);
|
||||||
|
conf.set(HdfsClientConfigKeys.Failover.PROXY_PROVIDER_KEY_PREFIX + "." +
|
||||||
|
logicalName, ObserverReadProxyProvider.class.getName());
|
||||||
|
FileSystem fs = FileSystem.get(new URI("hdfs://" + logicalName), conf);
|
||||||
|
return (DistributedFileSystem) fs;
|
||||||
|
}
|
||||||
|
|
||||||
public static void setFailoverConfigurations(MiniDFSCluster cluster,
|
public static void setFailoverConfigurations(MiniDFSCluster cluster,
|
||||||
Configuration conf) {
|
Configuration conf) {
|
||||||
setFailoverConfigurations(cluster, conf, getLogicalHostname(cluster));
|
setFailoverConfigurations(cluster, conf, getLogicalHostname(cluster));
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,337 @@
|
||||||
|
/**
|
||||||
|
* 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
|
||||||
|
* <p>
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
* <p>
|
||||||
|
* 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.hdfs.server.namenode.ha;
|
||||||
|
|
||||||
|
import org.apache.hadoop.conf.Configuration;
|
||||||
|
import org.apache.hadoop.fs.FileUtil;
|
||||||
|
import org.apache.hadoop.fs.Path;
|
||||||
|
import org.apache.hadoop.fs.permission.FsPermission;
|
||||||
|
import org.apache.hadoop.hdfs.DistributedFileSystem;
|
||||||
|
import org.apache.hadoop.hdfs.MiniDFSCluster;
|
||||||
|
import org.apache.hadoop.hdfs.qjournal.MiniQJMHACluster;
|
||||||
|
import org.apache.hadoop.hdfs.server.namenode.NameNode;
|
||||||
|
import org.apache.hadoop.io.retry.FailoverProxyProvider;
|
||||||
|
import org.apache.hadoop.io.retry.RetryInvocationHandler;
|
||||||
|
import org.junit.After;
|
||||||
|
import org.junit.Before;
|
||||||
|
import org.junit.Test;
|
||||||
|
|
||||||
|
import java.io.File;
|
||||||
|
import java.io.FileNotFoundException;
|
||||||
|
import java.io.IOException;
|
||||||
|
import java.lang.reflect.Proxy;
|
||||||
|
import java.net.URI;
|
||||||
|
|
||||||
|
import static org.junit.Assert.assertEquals;
|
||||||
|
import static org.junit.Assert.assertTrue;
|
||||||
|
import static org.junit.Assert.fail;
|
||||||
|
|
||||||
|
// Main unit tests for ObserverNode
|
||||||
|
public class TestObserverNode {
|
||||||
|
private Configuration conf;
|
||||||
|
private MiniQJMHACluster qjmhaCluster;
|
||||||
|
private MiniDFSCluster dfsCluster;
|
||||||
|
private NameNode[] namenodes;
|
||||||
|
private Path testPath;
|
||||||
|
private Path testPath2;
|
||||||
|
private Path testPath3;
|
||||||
|
|
||||||
|
/** These are set in each individual test case */
|
||||||
|
private DistributedFileSystem dfs;
|
||||||
|
private ObserverReadProxyProvider<?> provider;
|
||||||
|
|
||||||
|
@Before
|
||||||
|
public void setUp() throws Exception {
|
||||||
|
conf = new Configuration();
|
||||||
|
setUpCluster(1);
|
||||||
|
|
||||||
|
testPath = new Path("/test");
|
||||||
|
testPath2 = new Path("/test2");
|
||||||
|
testPath3 = new Path("/test3");
|
||||||
|
}
|
||||||
|
|
||||||
|
@After
|
||||||
|
public void cleanUp() throws IOException {
|
||||||
|
if (qjmhaCluster != null) {
|
||||||
|
qjmhaCluster.shutdown();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testSimpleRead() throws Exception {
|
||||||
|
setObserverRead(true);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
try {
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
fail("Should throw FileNotFoundException");
|
||||||
|
} catch (FileNotFoundException e) {
|
||||||
|
// Pass
|
||||||
|
}
|
||||||
|
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath2, FsPermission.getDefault());
|
||||||
|
assertSentTo(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testFailover() throws Exception {
|
||||||
|
setObserverRead(false);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
assertSentTo(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
dfsCluster.transitionToStandby(0);
|
||||||
|
dfsCluster.transitionToActive(1);
|
||||||
|
dfsCluster.waitActive();
|
||||||
|
|
||||||
|
dfs.mkdir(testPath2, FsPermission.getDefault());
|
||||||
|
assertSentTo(1);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testDoubleFailover() throws Exception {
|
||||||
|
setObserverRead(true);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
dfs.mkdir(testPath2, FsPermission.getDefault());
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
dfsCluster.transitionToStandby(0);
|
||||||
|
dfsCluster.transitionToActive(1);
|
||||||
|
dfsCluster.waitActive(1);
|
||||||
|
|
||||||
|
rollEditLogAndTail(1);
|
||||||
|
dfs.getFileStatus(testPath2);
|
||||||
|
assertSentTo(2);
|
||||||
|
dfs.mkdir(testPath3, FsPermission.getDefault());
|
||||||
|
assertSentTo(1);
|
||||||
|
|
||||||
|
dfsCluster.transitionToStandby(1);
|
||||||
|
dfsCluster.transitionToActive(0);
|
||||||
|
dfsCluster.waitActive(0);
|
||||||
|
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath3);
|
||||||
|
assertSentTo(2);
|
||||||
|
dfs.delete(testPath3, false);
|
||||||
|
assertSentTo(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testObserverFailover() throws Exception {
|
||||||
|
setUpCluster(2);
|
||||||
|
setObserverRead(true);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentToAny(2, 3);
|
||||||
|
|
||||||
|
// Transition observer #2 to standby, request should go to the #3.
|
||||||
|
dfsCluster.transitionToStandby(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(3);
|
||||||
|
|
||||||
|
// Transition observer #3 to standby, request should go to active
|
||||||
|
dfsCluster.transitionToStandby(3);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
// Transition #2 back to observer, request should go to #2
|
||||||
|
dfsCluster.transitionToObserver(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
|
||||||
|
// Transition #3 back to observer, request should go to either #2 or #3
|
||||||
|
dfsCluster.transitionToObserver(3);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentToAny(2, 3);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testObserverShutdown() throws Exception {
|
||||||
|
setObserverRead(true);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
|
||||||
|
// Shutdown the observer - requests should go to active
|
||||||
|
dfsCluster.shutdownNameNode(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
// Start the observer again - requests should go to observer
|
||||||
|
dfsCluster.restartNameNode(2);
|
||||||
|
dfsCluster.transitionToObserver(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testObserverFailOverAndShutdown() throws Exception {
|
||||||
|
// Test the case when there is a failover before ONN shutdown
|
||||||
|
setObserverRead(true);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
|
||||||
|
dfsCluster.transitionToStandby(0);
|
||||||
|
dfsCluster.transitionToActive(1);
|
||||||
|
dfsCluster.waitActive();
|
||||||
|
|
||||||
|
// Shutdown the observer - requests should go to active
|
||||||
|
dfsCluster.shutdownNameNode(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(1);
|
||||||
|
|
||||||
|
// Start the observer again - requests should go to observer
|
||||||
|
dfsCluster.restartNameNode(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(1);
|
||||||
|
|
||||||
|
dfsCluster.transitionToObserver(2);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentTo(2);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testMultiObserver() throws Exception {
|
||||||
|
setUpCluster(2);
|
||||||
|
setObserverRead(true);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath, FsPermission.getDefault());
|
||||||
|
assertSentTo(0);
|
||||||
|
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
dfs.getFileStatus(testPath);
|
||||||
|
assertSentToAny(2, 3);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath2, FsPermission.getDefault());
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
|
||||||
|
// Shutdown first observer, request should go to the second one
|
||||||
|
dfsCluster.shutdownNameNode(2);
|
||||||
|
dfs.listStatus(testPath2);
|
||||||
|
assertSentTo(3);
|
||||||
|
|
||||||
|
// Restart the first observer
|
||||||
|
dfsCluster.restartNameNode(2);
|
||||||
|
dfs.listStatus(testPath);
|
||||||
|
assertSentTo(3);
|
||||||
|
|
||||||
|
dfsCluster.transitionToObserver(2);
|
||||||
|
dfs.listStatus(testPath);
|
||||||
|
assertSentToAny(2, 3);
|
||||||
|
|
||||||
|
dfs.mkdir(testPath3, FsPermission.getDefault());
|
||||||
|
rollEditLogAndTail(0);
|
||||||
|
|
||||||
|
// Now shutdown the second observer, request should go to the first one
|
||||||
|
dfsCluster.shutdownNameNode(3);
|
||||||
|
dfs.listStatus(testPath3);
|
||||||
|
assertSentTo(2);
|
||||||
|
|
||||||
|
// Shutdown both, request should go to active
|
||||||
|
dfsCluster.shutdownNameNode(2);
|
||||||
|
dfs.listStatus(testPath3);
|
||||||
|
assertSentTo(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testBootstrap() throws Exception {
|
||||||
|
for (URI u : dfsCluster.getNameDirs(2)) {
|
||||||
|
File dir = new File(u.getPath());
|
||||||
|
assertTrue(FileUtil.fullyDelete(dir));
|
||||||
|
}
|
||||||
|
int rc = BootstrapStandby.run(
|
||||||
|
new String[]{"-nonInteractive"},
|
||||||
|
dfsCluster.getConfiguration(2)
|
||||||
|
);
|
||||||
|
assertEquals(0, rc);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void setUpCluster(int numObservers) throws Exception {
|
||||||
|
qjmhaCluster = new MiniQJMHACluster.Builder(conf)
|
||||||
|
.setNumNameNodes(2 + numObservers)
|
||||||
|
.build();
|
||||||
|
dfsCluster = qjmhaCluster.getDfsCluster();
|
||||||
|
|
||||||
|
namenodes = new NameNode[2 + numObservers];
|
||||||
|
for (int i = 0; i < namenodes.length; i++) {
|
||||||
|
namenodes[i] = dfsCluster.getNameNode(i);
|
||||||
|
}
|
||||||
|
|
||||||
|
dfsCluster.transitionToActive(0);
|
||||||
|
dfsCluster.waitActive(0);
|
||||||
|
|
||||||
|
for (int i = 0; i < numObservers; i++) {
|
||||||
|
dfsCluster.transitionToObserver(2 + i);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private void assertSentTo(int nnIdx) {
|
||||||
|
assertSentToAny(nnIdx);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void assertSentToAny(int... nnIndices) {
|
||||||
|
FailoverProxyProvider.ProxyInfo<?> pi = provider.getLastProxy();
|
||||||
|
for (int nnIdx : nnIndices) {
|
||||||
|
if (pi.proxyInfo.equals(
|
||||||
|
dfsCluster.getNameNode(nnIdx).getNameNodeAddress().toString())) {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
fail("Request was not sent to any of the expected namenodes");
|
||||||
|
}
|
||||||
|
|
||||||
|
private void setObserverRead(boolean flag) throws Exception {
|
||||||
|
dfs = HATestUtil.configureObserverReadFs(dfsCluster, conf, 0);
|
||||||
|
RetryInvocationHandler<?> handler =
|
||||||
|
(RetryInvocationHandler<?>) Proxy.getInvocationHandler(
|
||||||
|
dfs.getClient().getNamenode());
|
||||||
|
provider = (ObserverReadProxyProvider<?>) handler.getProxyProvider();
|
||||||
|
provider.setObserverReadEnabled(flag);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void rollEditLogAndTail(int indexForActiveNN) throws Exception {
|
||||||
|
dfsCluster.getNameNode(indexForActiveNN).getRpcServer().rollEditLog();
|
||||||
|
for (int i = 2; i < namenodes.length; i++) {
|
||||||
|
dfsCluster.getNameNode(i).getNamesystem().getEditLogTailer()
|
||||||
|
.doTailEdits();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue