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HDFS-13488. RBF: Reject requests when a Router is overloaded. Contributed by Inigo Goiri.

This commit is contained in:
Yiqun Lin 2018-05-02 14:49:39 +08:00
parent 8f42dafcf8
commit 37269261d1
14 changed files with 349 additions and 108 deletions
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2
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/FederationRPCMBean.java
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@ -40,6 +40,8 @@ public interface FederationRPCMBean {
long getProxyOpFailureStandby();
long getProxyOpFailureClientOverloaded();
long getProxyOpNotImplemented();
long getProxyOpRetries();

10
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/FederationRPCMetrics.java
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@ -54,6 +54,8 @@ public class FederationRPCMetrics implements FederationRPCMBean {
private MutableCounterLong proxyOpFailureStandby;
@Metric("Number of operations to hit a standby NN")
private MutableCounterLong proxyOpFailureCommunicate;
@Metric("Number of operations to hit a client overloaded Router")
private MutableCounterLong proxyOpFailureClientOverloaded;
@Metric("Number of operations not implemented")
private MutableCounterLong proxyOpNotImplemented;
@Metric("Number of operation retries")
@ -118,6 +120,14 @@ public long getProxyOpFailureCommunicate() {
return proxyOpFailureCommunicate.value();
}
public void incrProxyOpFailureClientOverloaded() {
proxyOpFailureClientOverloaded.incr();
}
@Override
public long getProxyOpFailureClientOverloaded() {
return proxyOpFailureClientOverloaded.value();
}
public void incrProxyOpNotImplemented() {
proxyOpNotImplemented.incr();

5
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/FederationRPCPerformanceMonitor.java
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@ -153,6 +153,11 @@ public void proxyOpFailureCommunicate() {
metrics.incrProxyOpFailureCommunicate();
}
@Override
public void proxyOpFailureClientOverloaded() {
metrics.incrProxyOpFailureClientOverloaded();
}
@Override
public void proxyOpNotImplemented() {
metrics.incrProxyOpNotImplemented();

3
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RBFConfigKeys.java
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@ -113,6 +113,9 @@ public class RBFConfigKeys extends CommonConfigurationKeysPublic {
public static final String DFS_ROUTER_CLIENT_MAX_ATTEMPTS =
FEDERATION_ROUTER_PREFIX + "client.retry.max.attempts";
public static final int DFS_ROUTER_CLIENT_MAX_ATTEMPTS_DEFAULT = 3;
public static final String DFS_ROUTER_CLIENT_REJECT_OVERLOAD =
FEDERATION_ROUTER_PREFIX + "client.reject.overload";
public static final boolean DFS_ROUTER_CLIENT_REJECT_OVERLOAD_DEFAULT = false;
// HDFS Router State Store connection
public static final String FEDERATION_FILE_RESOLVER_CLIENT_CLASS =

31
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java
View File

@ -35,13 +35,16 @@
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@ -98,7 +101,7 @@ public class RouterRpcClient {
/** Connection pool to the Namenodes per user for performance. */
private final ConnectionManager connectionManager;
/** Service to run asynchronous calls. */
private final ExecutorService executorService;
private final ThreadPoolExecutor executorService;
/** Retry policy for router -> NN communication. */
private final RetryPolicy retryPolicy;
/** Optional perf monitor. */
@ -131,8 +134,16 @@ public RouterRpcClient(Configuration conf, String identifier,
ThreadFactory threadFactory = new ThreadFactoryBuilder()
.setNameFormat("RPC Router Client-%d")
.build();
this.executorService = Executors.newFixedThreadPool(
numThreads, threadFactory);
BlockingQueue<Runnable> workQueue;
if (conf.getBoolean(
RBFConfigKeys.DFS_ROUTER_CLIENT_REJECT_OVERLOAD,
RBFConfigKeys.DFS_ROUTER_CLIENT_REJECT_OVERLOAD_DEFAULT)) {
workQueue = new ArrayBlockingQueue<>(numThreads);
} else {
workQueue = new LinkedBlockingQueue<>();
}
this.executorService = new ThreadPoolExecutor(numThreads, numThreads,
0L, TimeUnit.MILLISECONDS, workQueue, threadFactory);
this.rpcMonitor = monitor;
@ -1106,6 +1117,16 @@ public Object call() throws Exception {
}
return results;
} catch (RejectedExecutionException e) {
if (rpcMonitor != null) {
rpcMonitor.proxyOpFailureClientOverloaded();
}
int active = executorService.getActiveCount();
int total = executorService.getMaximumPoolSize();
String msg = "Not enough client threads " + active + "/" + total;
LOG.error(msg);
throw new StandbyException(
"Router " + routerId + " is overloaded: " + msg);
} catch (InterruptedException ex) {
LOG.error("Unexpected error while invoking API: {}", ex.getMessage());
throw new IOException(

6
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcMonitor.java
View File

@ -75,6 +75,12 @@ void init(
*/
void proxyOpFailureCommunicate();
/**
* Failed to proxy an operation to a Namenode because the client was
* overloaded.
*/
void proxyOpFailureClientOverloaded();
/**
* Failed to proxy an operation because it is not implemented.
*/

11
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java
View File

@ -289,7 +289,6 @@ public RouterRpcServer(Configuration configuration, Router router,
// We don't want the server to log the full stack trace for some exceptions
this.rpcServer.addTerseExceptions(
RemoteException.class,
StandbyException.class,
SafeModeException.class,
FileNotFoundException.class,
FileAlreadyExistsException.class,
@ -298,6 +297,9 @@ public RouterRpcServer(Configuration configuration, Router router,
NotReplicatedYetException.class,
IOException.class);
this.rpcServer.addSuppressedLoggingExceptions(
StandbyException.class);
// The RPC-server port can be ephemeral... ensure we have the correct info
InetSocketAddress listenAddress = this.rpcServer.getListenerAddress();
this.rpcAddress = new InetSocketAddress(
@ -413,7 +415,7 @@ public InetSocketAddress getRpcAddress() {
* @throws UnsupportedOperationException If the operation is not supported.
*/
protected void checkOperation(OperationCategory op, boolean supported)
throws RouterSafeModeException, UnsupportedOperationException {
throws StandbyException, UnsupportedOperationException {
checkOperation(op);
if (!supported) {
@ -435,7 +437,7 @@ protected void checkOperation(OperationCategory op, boolean supported)
* client requests.
*/
protected void checkOperation(OperationCategory op)
throws RouterSafeModeException {
throws StandbyException {
// Log the function we are currently calling.
if (rpcMonitor != null) {
rpcMonitor.startOp();
@ -459,7 +461,8 @@ protected void checkOperation(OperationCategory op)
if (rpcMonitor != null) {
rpcMonitor.routerFailureSafemode();
}
throw new RouterSafeModeException(router.getRouterId(), op);
throw new StandbyException("Router " + router.getRouterId() +
" is in safe mode and cannot handle " + op + " requests");
}
}

53
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterSafeModeException.java
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@ -1,53 +0,0 @@
/**
* 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.hdfs.server.federation.router;
import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
import org.apache.hadoop.ipc.StandbyException;
/**
* Exception that the Router throws when it is in safe mode. This extends
* {@link StandbyException} for the client to try another Router when it gets
* this exception.
*/
public class RouterSafeModeException extends StandbyException {
private static final long serialVersionUID = 453568188334993493L;
/** Identifier of the Router that generated this exception. */
private final String routerId;
/**
* Build a new Router safe mode exception.
* @param router Identifier of the Router.
* @param op Category of the operation (READ/WRITE).
*/
public RouterSafeModeException(String router, OperationCategory op) {
super("Router " + router + " is in safe mode and cannot handle " + op
+ " requests.");
this.routerId = router;
}
/**
* Get the id of the Router that generated this exception.
* @return Id of the Router that generated this exception.
*/
public String getRouterId() {
return this.routerId;
}
}

9
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/resources/hdfs-rbf-default.xml
View File

@ -431,4 +431,13 @@
</description>
</property>
<property>
<name>dfs.federation.router.client.reject.overload</name>
<value>false</value>
<description>
Set to true to reject client requests when we run out of RPC client
threads.
</description>
</property>
</configuration>

2
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/FederationTestUtils.java
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@ -59,7 +59,7 @@
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.Whitebox;
import org.mockito.internal.util.reflection.Whitebox;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.slf4j.Logger;

28
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/StateStoreDFSCluster.java
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@ -28,6 +28,10 @@
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.hdfs.server.federation.resolver.ActiveNamenodeResolver;
import org.apache.hadoop.hdfs.server.federation.resolver.FederationNamenodeServiceState;
import org.apache.hadoop.hdfs.server.federation.resolver.FileSubclusterResolver;
@ -37,6 +41,7 @@
import org.apache.hadoop.hdfs.server.federation.store.StateStoreService;
import org.apache.hadoop.hdfs.server.federation.store.records.MembershipState;
import org.apache.hadoop.hdfs.server.federation.store.records.MountTable;
import org.apache.hadoop.util.StringUtils;
/**
* Test utility to mimic a federated HDFS cluster with a router and a state
@ -145,4 +150,27 @@ public List<MountTable> generateMockMountTable() throws IOException {
entries.add(entry);
return entries;
}
/**
* Get the client configuration which targets all the Routers. It uses the HA
* setup to fails over between them.
* @return Configuration for the client which uses two routers.
*/
public Configuration getRouterClientConf() {
List<RouterContext> routers = getRouters();
Configuration clientConf = DFSTestUtil.newHAConfiguration("fed");
int i = 0;
List<String> names = new ArrayList<>(routers.size());
for (RouterContext routerContext : routers) {
String name = "r" + i++;
clientConf.set(
DFSConfigKeys.DFS_NAMENODE_RPC_ADDRESS_KEY + ".fed." + name,
"localhost:" + routerContext.getRpcPort());
names.add(name);
}
clientConf.set(DFSUtil.addKeySuffixes(
HdfsClientConfigKeys.DFS_HA_NAMENODES_KEY_PREFIX, "fed"),
StringUtils.join(",", names));
return clientConf;
}
}

243
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterClientRejectOverload.java Normal file
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@ -0,0 +1,243 @@
/**
* 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.hdfs.server.federation.router;
import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.simulateSlowNamenode;
import static org.apache.hadoop.test.GenericTestUtils.assertExceptionContains;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.server.federation.MiniRouterDFSCluster.RouterContext;
import org.apache.hadoop.hdfs.server.federation.RouterConfigBuilder;
import org.apache.hadoop.hdfs.server.federation.StateStoreDFSCluster;
import org.apache.hadoop.hdfs.server.federation.metrics.FederationRPCMetrics;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.ipc.StandbyException;
import org.junit.After;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Test the Router overload control which rejects requests when the RPC client
* is overloaded. This feature is managed by
* {@link RBFConfigKeys#DFS_ROUTER_CLIENT_REJECT_OVERLOAD}.
*/
public class TestRouterClientRejectOverload {
private static final Logger LOG =
LoggerFactory.getLogger(TestRouterClientRejectOverload.class);
private StateStoreDFSCluster cluster;
@After
public void cleanup() {
if (cluster != null) {
cluster.shutdown();
cluster = null;
}
}
private void setupCluster(boolean overloadControl) throws Exception {
// Build and start a federated cluster
cluster = new StateStoreDFSCluster(false, 2);
Configuration routerConf = new RouterConfigBuilder()
.stateStore()
.metrics()
.admin()
.rpc()
.build();
// Reduce the number of RPC clients threads to overload the Router easy
routerConf.setInt(RBFConfigKeys.DFS_ROUTER_CLIENT_THREADS_SIZE, 4);
// Overload control
routerConf.setBoolean(
RBFConfigKeys.DFS_ROUTER_CLIENT_REJECT_OVERLOAD, overloadControl);
// No need for datanodes as we use renewLease() for testing
cluster.setNumDatanodesPerNameservice(0);
cluster.addRouterOverrides(routerConf);
cluster.startCluster();
cluster.startRouters();
cluster.waitClusterUp();
}
@Test
public void testWithoutOverloadControl() throws Exception {
setupCluster(false);
// Nobody should get overloaded
testOverloaded(0);
// Set subcluster 0 as slow
MiniDFSCluster dfsCluster = cluster.getCluster();
NameNode nn0 = dfsCluster.getNameNode(0);
simulateSlowNamenode(nn0, 1);
// Nobody should get overloaded, but it will be really slow
testOverloaded(0);
// No rejected requests expected
for (RouterContext router : cluster.getRouters()) {
FederationRPCMetrics rpcMetrics =
router.getRouter().getRpcServer().getRPCMetrics();
assertEquals(0, rpcMetrics.getProxyOpFailureClientOverloaded());
}
}
@Test
public void testOverloadControl() throws Exception {
setupCluster(true);
List<RouterContext> routers = cluster.getRouters();
FederationRPCMetrics rpcMetrics0 =
routers.get(0).getRouter().getRpcServer().getRPCMetrics();
FederationRPCMetrics rpcMetrics1 =
routers.get(1).getRouter().getRpcServer().getRPCMetrics();
// Nobody should get overloaded
testOverloaded(0);
assertEquals(0, rpcMetrics0.getProxyOpFailureClientOverloaded());
assertEquals(0, rpcMetrics1.getProxyOpFailureClientOverloaded());
// Set subcluster 0 as slow
MiniDFSCluster dfsCluster = cluster.getCluster();
NameNode nn0 = dfsCluster.getNameNode(0);
simulateSlowNamenode(nn0, 1);
// The subcluster should be overloaded now and reject 4-5 requests
testOverloaded(4, 6);
assertTrue(rpcMetrics0.getProxyOpFailureClientOverloaded()
+ rpcMetrics1.getProxyOpFailureClientOverloaded() >= 4);
// Client using HA with 2 Routers
// A single Router gets overloaded, but 2 will handle it
Configuration clientConf = cluster.getRouterClientConf();
// Each Router should get a similar number of ops (>=8) out of 2*10
long iniProxyOps0 = rpcMetrics0.getProxyOps();
long iniProxyOps1 = rpcMetrics1.getProxyOps();
testOverloaded(0, 0, new URI("hdfs://fed/"), clientConf, 10);
long proxyOps0 = rpcMetrics0.getProxyOps() - iniProxyOps0;
long proxyOps1 = rpcMetrics1.getProxyOps() - iniProxyOps1;
assertEquals(2 * 10, proxyOps0 + proxyOps1);
assertTrue(proxyOps0 + " operations: not distributed", proxyOps0 >= 8);
assertTrue(proxyOps1 + " operations: not distributed", proxyOps1 >= 8);
}
private void testOverloaded(int expOverload) throws Exception {
testOverloaded(expOverload, expOverload);
}
private void testOverloaded(int expOverloadMin, int expOverloadMax)
throws Exception {
RouterContext routerContext = cluster.getRandomRouter();
URI address = routerContext.getFileSystemURI();
Configuration conf = new HdfsConfiguration();
testOverloaded(expOverloadMin, expOverloadMax, address, conf, 10);
}
/**
* Test if the Router gets overloaded by submitting requests in parallel.
* We check how many requests got rejected at the end.
* @param expOverloadMin Min number of requests expected as overloaded.
* @param expOverloadMax Max number of requests expected as overloaded.
* @param address Destination address.
* @param conf Configuration of the client.
* @param numOps Number of operations to submit.
* @throws Exception If it cannot perform the test.
*/
private void testOverloaded(int expOverloadMin, int expOverloadMax,
final URI address, final Configuration conf, final int numOps)
throws Exception {
// Submit renewLease() ops which go to all subclusters
final AtomicInteger overloadException = new AtomicInteger();
ExecutorService exec = Executors.newFixedThreadPool(numOps);
List<Future<?>> futures = new ArrayList<>();
for (int i = 0; i < numOps; i++) {
// Stagger the operations a little (50ms)
final int sleepTime = i * 50;
Future<?> future = exec.submit(new Runnable() {
@Override
public void run() {
DFSClient routerClient = null;
try {
Thread.sleep(sleepTime);
routerClient = new DFSClient(address, conf);
String clientName = routerClient.getClientName();
ClientProtocol routerProto = routerClient.getNamenode();
routerProto.renewLease(clientName);
} catch (RemoteException re) {
IOException ioe = re.unwrapRemoteException();
assertTrue("Wrong exception: " + ioe,
ioe instanceof StandbyException);
assertExceptionContains("is overloaded", ioe);
overloadException.incrementAndGet();
} catch (IOException e) {
fail("Unexpected exception: " + e);
} catch (InterruptedException e) {
fail("Cannot sleep: " + e);
} finally {
if (routerClient != null) {
try {
routerClient.close();
} catch (IOException e) {
LOG.error("Cannot close the client");
}
}
}
}
});
futures.add(future);
}
// Wait until all the requests are done
while (!futures.isEmpty()) {
futures.remove(0).get();
}
exec.shutdown();
int num = overloadException.get();
if (expOverloadMin == expOverloadMax) {
assertEquals(expOverloadMin, num);
} else {
assertTrue("Expected >=" + expOverloadMin + " but was " + num,
num >= expOverloadMin);
assertTrue("Expected <=" + expOverloadMax + " but was " + num,
num <= expOverloadMax);
}
}
}

51
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRPCClientRetries.java
View File

@ -17,13 +17,13 @@
*/
package org.apache.hadoop.hdfs.server.federation.router;
import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.simulateSlowNamenode;
import static org.apache.hadoop.test.GenericTestUtils.assertExceptionContains;
import static org.apache.hadoop.test.GenericTestUtils.waitFor;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.spy;
import java.io.IOException;
import java.util.List;
@ -44,13 +44,8 @@
import org.apache.hadoop.hdfs.server.federation.resolver.FederationNamenodeContext;
import org.apache.hadoop.hdfs.server.federation.resolver.MembershipNamenodeResolver;
import org.apache.hadoop.hdfs.server.federation.resolver.NamenodeStatusReport;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
import org.apache.hadoop.hdfs.server.namenode.ha.HAContext;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.Whitebox;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
import org.junit.After;
@ -58,10 +53,6 @@
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Supplier;
@ -70,9 +61,6 @@
*/
public class TestRouterRPCClientRetries {
private static final Logger LOG =
LoggerFactory.getLogger(TestRouterRPCClientRetries.class);
private static StateStoreDFSCluster cluster;
private static NamenodeContext nnContext1;
private static RouterContext routerContext;
@ -144,7 +132,7 @@ public void testRetryWhenAllNameServiceDown() throws Exception {
fail("Should have thrown RemoteException error.");
} catch (RemoteException e) {
String ns0 = cluster.getNameservices().get(0);
GenericTestUtils.assertExceptionContains(
assertExceptionContains(
"No namenode available under nameservice " + ns0, e);
}
@ -212,14 +200,14 @@ public void testNamenodeMetricsSlow() throws Exception {
// Making subcluster0 slow to reply, should only get DNs from nn1
MiniDFSCluster dfsCluster = cluster.getCluster();
NameNode nn0 = dfsCluster.getNameNode(0);
simulateNNSlow(nn0);
simulateSlowNamenode(nn0, 3);
waitUpdateLiveNodes(jsonString2, metrics);
final String jsonString3 = metrics.getLiveNodes();
assertEquals(2, getNumDatanodes(jsonString3));
// Making subcluster1 slow to reply, shouldn't get any DNs
NameNode nn1 = dfsCluster.getNameNode(1);
simulateNNSlow(nn1);
simulateSlowNamenode(nn1, 3);
waitUpdateLiveNodes(jsonString3, metrics);
final String jsonString4 = metrics.getLiveNodes();
assertEquals(0, getNumDatanodes(jsonString4));
@ -249,36 +237,11 @@ private static int getNumDatanodes(final String jsonString)
private static void waitUpdateLiveNodes(
final String oldValue, final NamenodeBeanMetrics metrics)
throws Exception {
GenericTestUtils.waitFor(new Supplier<Boolean>() {
waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
return !oldValue.equals(metrics.getLiveNodes());
}
}, 500, 5 * 1000);
}
/**
* Simulate that a Namenode is slow by adding a sleep to the check operation
* in the NN.
* @param nn Namenode to simulate slow.
* @throws Exception If we cannot add the sleep time.
*/
private static void simulateNNSlow(final NameNode nn) throws Exception {
FSNamesystem namesystem = nn.getNamesystem();
HAContext haContext = namesystem.getHAContext();
HAContext spyHAContext = spy(haContext);
doAnswer(new Answer<Object>() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
LOG.info("Simulating slow namenode {}", invocation.getMock());
try {
Thread.sleep(3 * 1000);
} catch(InterruptedException e) {
LOG.error("Simulating a slow namenode aborted");
}
return null;
}
}).when(spyHAContext).checkOperation(any(OperationCategory.class));
Whitebox.setInternalState(namesystem, "haContext", spyHAContext);
}
}

3
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterSafemode.java
View File

@ -33,6 +33,7 @@
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.federation.RouterConfigBuilder;
import org.apache.hadoop.ipc.StandbyException;
import org.apache.hadoop.service.Service.STATE;
import org.apache.hadoop.util.Time;
import org.junit.After;
@ -187,7 +188,7 @@ public void testRouterRpcSafeMode()
try {
router.getRpcServer().delete("/testfile.txt", true);
fail("We should have thrown a safe mode exception");
} catch (RouterSafeModeException sme) {
} catch (StandbyException sme) {
exception = true;
}
assertTrue("We should have thrown a safe mode exception", exception);