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YARN-6955. Handle concurrent register AM requests in FederationInterceptor. (Botong Huang via Subru).

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This commit is contained in:
Subru Krishnan 2017-08-07 16:58:29 -07:00
parent bc206806da
commit c61f2c4198
4 changed files with 110 additions and 43 deletions
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4
hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
View File

@ -594,11 +594,9 @@
<Bug pattern="UL_UNRELEASED_LOCK_EXCEPTION_PATH" />
</Match>
<!-- Ignore false alert for RCN_REDUNDANT_NULLCHECK_OF_NULL_VALUE -->
<Match>
<Class name="org.apache.hadoop.yarn.server.nodemanager.amrmproxy.FederationInterceptor" />
<Method name="registerApplicationMaster" />
<Bug pattern="RCN_REDUNDANT_NULLCHECK_OF_NULL_VALUE" />
<Bug pattern="IS2_INCONSISTENT_SYNC" />
</Match>
</FindBugsFilter>

18
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/MockResourceManagerFacade.java
View File

@ -246,6 +246,16 @@ public RegisterApplicationMasterResponse registerApplicationMaster(
shouldReRegisterNext = false;
synchronized (applicationContainerIdMap) {
if (applicationContainerIdMap.containsKey(amrmToken)) {
throw new InvalidApplicationMasterRequestException(
AMRMClientUtils.APP_ALREADY_REGISTERED_MESSAGE);
}
// Keep track of the containers that are returned to this application
applicationContainerIdMap.put(amrmToken, new ArrayList<ContainerId>());
}
// Make sure we wait for certain test cases last in the method
synchronized (syncObj) {
syncObj.notifyAll();
// We reuse the port number to indicate whether the unit test want us to
@ -261,14 +271,6 @@ public RegisterApplicationMasterResponse registerApplicationMaster(
}
}
synchronized (applicationContainerIdMap) {
if (applicationContainerIdMap.containsKey(amrmToken)) {
throw new InvalidApplicationMasterRequestException(
AMRMClientUtils.APP_ALREADY_REGISTERED_MESSAGE);
}
// Keep track of the containers that are returned to this application
applicationContainerIdMap.put(amrmToken, new ArrayList<ContainerId>());
}
return RegisterApplicationMasterResponse.newInstance(null, null, null, null,
null, request.getHost(), null);
}

31
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/amrmproxy/FederationInterceptor.java
View File

@ -208,21 +208,24 @@ public void init(AMRMProxyApplicationContext appContext) {
* requests from AM because of timeout between AM and AMRMProxy, which is
* shorter than the timeout + failOver between FederationInterceptor
* (AMRMProxy) and RM.
*
* For the same reason, this method needs to be synchronized.
*/
@Override
public RegisterApplicationMasterResponse registerApplicationMaster(
RegisterApplicationMasterRequest request)
public synchronized RegisterApplicationMasterResponse
registerApplicationMaster(RegisterApplicationMasterRequest request)
throws YarnException, IOException {
// If AM is calling with a different request, complain
if (this.amRegistrationRequest != null
&& !this.amRegistrationRequest.equals(request)) {
throw new YarnException("A different request body recieved. AM should"
+ " not call registerApplicationMaster with different request body");
if (this.amRegistrationRequest != null) {
if (!this.amRegistrationRequest.equals(request)) {
throw new YarnException("AM should not call "
+ "registerApplicationMaster with a different request body");
}
} else {
// Save the registration request. This will be used for registering with
// secondary sub-clusters using UAMs, as well as re-register later
this.amRegistrationRequest = request;
}
/*
* Present to AM as if we are the RM that never fails over. When actual RM
@ -245,22 +248,8 @@ public RegisterApplicationMasterResponse registerApplicationMaster(
* is running and will breaks the elasticity feature. The registration with
* the other sub-cluster RM will be done lazily as needed later.
*/
try {
this.amRegistrationResponse =
this.homeRM.registerApplicationMaster(request);
} catch (InvalidApplicationMasterRequestException e) {
if (e.getMessage()
.contains(AMRMClientUtils.APP_ALREADY_REGISTERED_MESSAGE)) {
// Some other register thread might have succeeded in the meantime
if (this.amRegistrationResponse != null) {
LOG.info("Other concurrent thread registered successfully, "
+ "simply return the same success register response");
return this.amRegistrationResponse;
}
}
// This is a real issue, throw back to AM
throw e;
}
// the queue this application belongs will be used for getting
// AMRMProxy policy from state store.

88
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/amrmproxy/TestFederationInterceptor.java
View File

@ -21,6 +21,11 @@
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest;
import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse;
@ -36,6 +41,7 @@
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.InvalidApplicationMasterRequestException;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.MockResourceManagerFacade;
import org.apache.hadoop.yarn.server.federation.policies.manager.UniformBroadcastPolicyManager;
import org.apache.hadoop.yarn.server.federation.store.impl.MemoryFederationStateStore;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterDeregisterRequest;
@ -234,7 +240,7 @@ public void testMultipleSubClusters() throws Exception {
RegisterApplicationMasterRequest registerReq =
Records.newRecord(RegisterApplicationMasterRequest.class);
registerReq.setHost(Integer.toString(testAppId));
registerReq.setRpcPort(testAppId);
registerReq.setRpcPort(0);
registerReq.setTrackingUrl("");
RegisterApplicationMasterResponse registerResponse =
@ -298,7 +304,7 @@ public void testReregister() throws Exception {
RegisterApplicationMasterRequest registerReq =
Records.newRecord(RegisterApplicationMasterRequest.class);
registerReq.setHost(Integer.toString(testAppId));
registerReq.setRpcPort(testAppId);
registerReq.setRpcPort(0);
registerReq.setTrackingUrl("");
RegisterApplicationMasterResponse registerResponse =
@ -338,6 +344,78 @@ public void testReregister() throws Exception {
Assert.assertEquals(true, finshResponse.getIsUnregistered());
}
/*
* Test concurrent register threads. This is possible because the timeout
* between AM and AMRMProxy is shorter than the timeout + failOver between
* FederationInterceptor (AMRMProxy) and RM. When first call is blocked due to
* RM failover and AM timeout, it will call us resulting in a second register
* thread.
*/
@Test(timeout = 5000)
public void testConcurrentRegister()
throws InterruptedException, ExecutionException {
ExecutorService threadpool = Executors.newCachedThreadPool();
ExecutorCompletionService<RegisterApplicationMasterResponse> compSvc =
new ExecutorCompletionService<>(threadpool);
Object syncObj = MockResourceManagerFacade.getSyncObj();
// Two register threads
synchronized (syncObj) {
// Make sure first thread will block within RM, before the second thread
// starts
LOG.info("Starting first register thread");
compSvc.submit(new ConcurrentRegisterAMCallable());
try {
LOG.info("Test main starts waiting for the first thread to block");
syncObj.wait();
LOG.info("Test main wait finished");
} catch (Exception e) {
LOG.info("Test main wait interrupted", e);
}
}
// The second thread will get already registered exception from RM.
LOG.info("Starting second register thread");
compSvc.submit(new ConcurrentRegisterAMCallable());
// Notify the first register thread to return
LOG.info("Let first blocked register thread move on");
synchronized (syncObj) {
syncObj.notifyAll();
}
// Both thread should return without exception
RegisterApplicationMasterResponse response = compSvc.take().get();
Assert.assertNotNull(response);
response = compSvc.take().get();
Assert.assertNotNull(response);
threadpool.shutdown();
}
/**
* A callable that calls registerAM to RM with blocking.
*/
public class ConcurrentRegisterAMCallable
implements Callable<RegisterApplicationMasterResponse> {
@Override
public RegisterApplicationMasterResponse call() throws Exception {
RegisterApplicationMasterResponse response = null;
try {
// Use port number 1001 to let mock RM block in the register call
response = interceptor.registerApplicationMaster(
RegisterApplicationMasterRequest.newInstance(null, 1001, null));
} catch (Exception e) {
LOG.info("Register thread exception", e);
response = null;
}
return response;
}
}
@Test
public void testRequestInterceptorChainCreation() throws Exception {
RequestInterceptor root =
@ -381,7 +459,7 @@ public void testTwoIdenticalRegisterRequest() throws Exception {
RegisterApplicationMasterRequest registerReq =
Records.newRecord(RegisterApplicationMasterRequest.class);
registerReq.setHost(Integer.toString(testAppId));
registerReq.setRpcPort(testAppId);
registerReq.setRpcPort(0);
registerReq.setTrackingUrl("");
for (int i = 0; i < 2; i++) {
@ -397,7 +475,7 @@ public void testTwoDifferentRegisterRequest() throws Exception {
RegisterApplicationMasterRequest registerReq =
Records.newRecord(RegisterApplicationMasterRequest.class);
registerReq.setHost(Integer.toString(testAppId));
registerReq.setRpcPort(testAppId);
registerReq.setRpcPort(0);
registerReq.setTrackingUrl("");
RegisterApplicationMasterResponse registerResponse =
@ -407,7 +485,7 @@ public void testTwoDifferentRegisterRequest() throws Exception {
// Register the application second time with a different request obj
registerReq = Records.newRecord(RegisterApplicationMasterRequest.class);
registerReq.setHost(Integer.toString(testAppId));
registerReq.setRpcPort(testAppId);
registerReq.setRpcPort(0);
registerReq.setTrackingUrl("different");
try {
registerResponse = interceptor.registerApplicationMaster(registerReq);