YARN-1496. Protocol additions to allow moving apps between queues (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1567479 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sanford Ryza 2014-02-12 01:00:08 +00:00
parent 989f41078f
commit 81bff204c3
12 changed files with 428 additions and 0 deletions

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@ -90,6 +90,8 @@ import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoResponse;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationRequest;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesRequest;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesResponse;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenRequest;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenResponse;
import org.apache.hadoop.yarn.api.protocolrecords.SubmitApplicationRequest;
@ -99,6 +101,7 @@ import org.apache.hadoop.yarn.api.records.ApplicationReport;
import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
import org.apache.hadoop.yarn.api.records.YarnApplicationState;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.yarn.factories.RecordFactory;
import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
@ -354,6 +357,12 @@ public class TestClientRedirect {
CancelDelegationTokenRequest request) throws IOException {
return null;
}
@Override
public MoveApplicationAcrossQueuesResponse moveApplicationAcrossQueues(
MoveApplicationAcrossQueuesRequest request) throws YarnException, IOException {
return null;
}
}
class HistoryService extends AMService implements HSClientProtocol {

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@ -93,6 +93,9 @@ Release 2.4.0 - UNRELEASED
YARN-1637. Implemented a client library for Java users to post timeline
entities and events. (zjshen)
YARN-1496. Protocol additions to allow moving apps between queues (Sandy
Ryza)
IMPROVEMENTS
YARN-1007. Enhance History Reader interface for Containers. (Mayank Bansal via

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@ -44,6 +44,8 @@ import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoResponse;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationRequest;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesRequest;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesResponse;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenRequest;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenResponse;
import org.apache.hadoop.yarn.api.protocolrecords.SubmitApplicationRequest;
@ -339,4 +341,17 @@ public interface ApplicationClientProtocol {
public CancelDelegationTokenResponse cancelDelegationToken(
CancelDelegationTokenRequest request) throws YarnException,
IOException;
/**
* Move an application to a new queue.
*
* @param request the application ID and the target queue
* @return an empty response
* @throws YarnException
* @throws IOException
*/
@Public
@Unstable
public MoveApplicationAcrossQueuesResponse moveApplicationAcrossQueues(
MoveApplicationAcrossQueuesRequest request) throws YarnException, IOException;
}

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@ -0,0 +1,69 @@
/**
* 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.yarn.api.protocolrecords;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.ApplicationClientProtocol;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.util.Records;
/**
* <p>The request sent by the client to the <code>ResourceManager</code>
* to move a submitted application to a different queue.</p>
*
* <p>The request includes the {@link ApplicationId} of the application to be
* moved and the queue to place it in.</p>
*
* @see ApplicationClientProtocol#moveApplicationAcrossQueues(MoveApplicationAcrossQueuesRequest)
*/
@Public
@Unstable
public abstract class MoveApplicationAcrossQueuesRequest {
public static MoveApplicationAcrossQueuesRequest newInstance(ApplicationId appId, String queue) {
MoveApplicationAcrossQueuesRequest request =
Records.newRecord(MoveApplicationAcrossQueuesRequest.class);
request.setApplicationId(appId);
request.setTargetQueue(queue);
return request;
}
/**
* Get the <code>ApplicationId</code> of the application to be moved.
* @return <code>ApplicationId</code> of the application to be moved
*/
public abstract ApplicationId getApplicationId();
/**
* Set the <code>ApplicationId</code> of the application to be moved.
* @param appId <code>ApplicationId</code> of the application to be moved
*/
public abstract void setApplicationId(ApplicationId appId);
/**
* Get the queue to place the application in.
* @return the name of the queue to place the application in
*/
public abstract String getTargetQueue();
/**
* Get the queue to place the application in.
* @param queue the name of the queue to place the application in
*/
public abstract void setTargetQueue(String queue);
}

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@ -0,0 +1,47 @@
/**
* 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.yarn.api.protocolrecords;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.ApplicationClientProtocol;
import org.apache.hadoop.yarn.util.Records;
/**
* <p>
* The response sent by the <code>ResourceManager</code> to the client moving
* a submitted application to a different queue.
* </p>
* <p>
* A response without exception means that the move has completed successfully.
* </p>
*
* @see ApplicationClientProtocol#moveApplicationAcrossQueues(MoveApplicationAcrossQueuesRequest)
*/
@Public
@Unstable
public class MoveApplicationAcrossQueuesResponse {
@Private
@Unstable
public MoveApplicationAcrossQueuesResponse newInstance() {
MoveApplicationAcrossQueuesResponse response =
Records.newRecord(MoveApplicationAcrossQueuesResponse.class);
return response;
}
}

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@ -44,5 +44,6 @@ service ApplicationClientProtocolService {
rpc getDelegationToken(hadoop.common.GetDelegationTokenRequestProto) returns (hadoop.common.GetDelegationTokenResponseProto);
rpc renewDelegationToken(hadoop.common.RenewDelegationTokenRequestProto) returns (hadoop.common.RenewDelegationTokenResponseProto);
rpc cancelDelegationToken(hadoop.common.CancelDelegationTokenRequestProto) returns (hadoop.common.CancelDelegationTokenResponseProto);
rpc moveApplicationAcrossQueues(MoveApplicationAcrossQueuesRequestProto) returns (MoveApplicationAcrossQueuesResponseProto);
}

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@ -128,6 +128,14 @@ message GetClusterMetricsResponseProto {
optional YarnClusterMetricsProto cluster_metrics = 1;
}
message MoveApplicationAcrossQueuesRequestProto {
required ApplicationIdProto application_id = 1;
required string target_queue = 2;
}
message MoveApplicationAcrossQueuesResponseProto {
}
enum ApplicationsRequestScopeProto {
ALL = 0;
VIEWABLE = 1;

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@ -51,6 +51,8 @@ import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoResponse;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationRequest;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesRequest;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesResponse;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenRequest;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenResponse;
import org.apache.hadoop.yarn.api.protocolrecords.SubmitApplicationRequest;
@ -75,6 +77,8 @@ import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.GetQueueUserAclsInfoRe
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.GetQueueUserAclsInfoResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.KillApplicationRequestPBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.KillApplicationResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.MoveApplicationAcrossQueuesRequestPBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.MoveApplicationAcrossQueuesResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.RenewDelegationTokenRequestPBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.RenewDelegationTokenResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.SubmitApplicationRequestPBImpl;
@ -89,6 +93,7 @@ import org.apache.hadoop.yarn.proto.YarnServiceProtos.GetNewApplicationRequestPr
import org.apache.hadoop.yarn.proto.YarnServiceProtos.GetQueueInfoRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.GetQueueUserAclsInfoRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.KillApplicationRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.MoveApplicationAcrossQueuesRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.SubmitApplicationRequestProto;
import com.google.protobuf.ServiceException;
@ -291,4 +296,20 @@ public class ApplicationClientProtocolPBClientImpl implements ApplicationClientP
return null;
}
}
@Override
public MoveApplicationAcrossQueuesResponse moveApplicationAcrossQueues(
MoveApplicationAcrossQueuesRequest request) throws YarnException,
IOException {
MoveApplicationAcrossQueuesRequestProto requestProto =
((MoveApplicationAcrossQueuesRequestPBImpl) request).getProto();
try {
return new MoveApplicationAcrossQueuesResponsePBImpl(
proxy.moveApplicationAcrossQueues(null, requestProto));
} catch (ServiceException e) {
RPCUtil.unwrapAndThrowException(e);
return null;
}
}
}

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@ -39,6 +39,7 @@ import org.apache.hadoop.yarn.api.protocolrecords.GetNewApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.GetQueueInfoResponse;
import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoResponse;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesResponse;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenResponse;
import org.apache.hadoop.yarn.api.protocolrecords.SubmitApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.CancelDelegationTokenRequestPBImpl;
@ -61,6 +62,8 @@ import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.GetQueueUserAclsInfoRe
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.GetQueueUserAclsInfoResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.KillApplicationRequestPBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.KillApplicationResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.MoveApplicationAcrossQueuesRequestPBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.MoveApplicationAcrossQueuesResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.RenewDelegationTokenRequestPBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.RenewDelegationTokenResponsePBImpl;
import org.apache.hadoop.yarn.api.protocolrecords.impl.pb.SubmitApplicationRequestPBImpl;
@ -82,6 +85,8 @@ import org.apache.hadoop.yarn.proto.YarnServiceProtos.GetQueueUserAclsInfoReques
import org.apache.hadoop.yarn.proto.YarnServiceProtos.GetQueueUserAclsInfoResponseProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.KillApplicationRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.KillApplicationResponseProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.MoveApplicationAcrossQueuesRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.MoveApplicationAcrossQueuesResponseProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.SubmitApplicationRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.SubmitApplicationResponseProto;
@ -278,4 +283,20 @@ public class ApplicationClientProtocolPBServiceImpl implements ApplicationClient
throw new ServiceException(e);
}
}
@Override
public MoveApplicationAcrossQueuesResponseProto moveApplicationAcrossQueues(
RpcController controller, MoveApplicationAcrossQueuesRequestProto proto)
throws ServiceException {
MoveApplicationAcrossQueuesRequestPBImpl request =
new MoveApplicationAcrossQueuesRequestPBImpl(proto);
try {
MoveApplicationAcrossQueuesResponse response = real.moveApplicationAcrossQueues(request);
return ((MoveApplicationAcrossQueuesResponsePBImpl)response).getProto();
} catch (YarnException e) {
throw new ServiceException(e);
} catch (IOException e) {
throw new ServiceException(e);
}
}
}

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@ -0,0 +1,158 @@
/**
* 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.yarn.api.protocolrecords.impl.pb;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesRequest;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.impl.pb.ApplicationIdPBImpl;
import org.apache.hadoop.yarn.proto.YarnProtos.ApplicationIdProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.MoveApplicationAcrossQueuesRequestProto;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.MoveApplicationAcrossQueuesRequestProtoOrBuilder;
import com.google.protobuf.TextFormat;
@Private
@Unstable
public class MoveApplicationAcrossQueuesRequestPBImpl extends MoveApplicationAcrossQueuesRequest {
MoveApplicationAcrossQueuesRequestProto proto = MoveApplicationAcrossQueuesRequestProto.getDefaultInstance();
MoveApplicationAcrossQueuesRequestProto.Builder builder = null;
boolean viaProto = false;
private ApplicationId applicationId;
private String targetQueue;
public MoveApplicationAcrossQueuesRequestPBImpl() {
builder = MoveApplicationAcrossQueuesRequestProto.newBuilder();
}
public MoveApplicationAcrossQueuesRequestPBImpl(MoveApplicationAcrossQueuesRequestProto proto) {
this.proto = proto;
viaProto = true;
}
public MoveApplicationAcrossQueuesRequestProto getProto() {
mergeLocalToProto();
proto = viaProto ? proto : builder.build();
viaProto = true;
return proto;
}
@Override
public ApplicationId getApplicationId() {
if (this.applicationId != null) {
return this.applicationId;
}
MoveApplicationAcrossQueuesRequestProtoOrBuilder p = viaProto ? proto : builder;
if (!p.hasApplicationId()) {
return null;
}
this.applicationId = convertFromProtoFormat(p.getApplicationId());
return this.applicationId;
}
@Override
public void setApplicationId(ApplicationId appId) {
maybeInitBuilder();
if (applicationId == null) {
builder.clearApplicationId();
}
applicationId = appId;
}
@Override
public String getTargetQueue() {
if (this.targetQueue != null) {
return this.targetQueue;
}
MoveApplicationAcrossQueuesRequestProtoOrBuilder p = viaProto ? proto : builder;
if (!p.hasApplicationId()) {
return null;
}
this.targetQueue = p.getTargetQueue();
return this.targetQueue;
}
@Override
public void setTargetQueue(String queue) {
maybeInitBuilder();
if (applicationId == null) {
builder.clearTargetQueue();
}
targetQueue = queue;
}
private void mergeLocalToBuilder() {
if (applicationId != null) {
builder.setApplicationId(convertToProtoFormat(this.applicationId));
}
if (targetQueue != null) {
builder.setTargetQueue(this.targetQueue);
}
}
private void mergeLocalToProto() {
if (viaProto) {
maybeInitBuilder();
}
mergeLocalToBuilder();
proto = builder.build();
viaProto = true;
}
private void maybeInitBuilder() {
if (viaProto || builder == null) {
builder = MoveApplicationAcrossQueuesRequestProto.newBuilder(proto);
}
viaProto = false;
}
@Override
public int hashCode() {
return getProto().hashCode();
}
@Override
public boolean equals(Object other) {
if (other == null) {
return false;
}
if (other.getClass().isAssignableFrom(this.getClass())) {
return this.getProto().equals(this.getClass().cast(other).getProto());
}
return false;
}
@Override
public String toString() {
return TextFormat.shortDebugString(getProto());
}
private ApplicationIdPBImpl convertFromProtoFormat(ApplicationIdProto p) {
return new ApplicationIdPBImpl(p);
}
private ApplicationIdProto convertToProtoFormat(ApplicationId t) {
return ((ApplicationIdPBImpl)t).getProto();
}
}

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@ -0,0 +1,68 @@
/**
* 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.yarn.api.protocolrecords.impl.pb;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesResponse;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.MoveApplicationAcrossQueuesResponseProto;
import com.google.protobuf.TextFormat;
@Private
@Unstable
public class MoveApplicationAcrossQueuesResponsePBImpl extends MoveApplicationAcrossQueuesResponse {
MoveApplicationAcrossQueuesResponseProto proto = MoveApplicationAcrossQueuesResponseProto.getDefaultInstance();
MoveApplicationAcrossQueuesResponseProto.Builder builder = null;
boolean viaProto = false;
public MoveApplicationAcrossQueuesResponsePBImpl() {
builder = MoveApplicationAcrossQueuesResponseProto.newBuilder();
}
public MoveApplicationAcrossQueuesResponsePBImpl(MoveApplicationAcrossQueuesResponseProto proto) {
this.proto = proto;
viaProto = true;
}
public MoveApplicationAcrossQueuesResponseProto getProto() {
proto = viaProto ? proto : builder.build();
viaProto = true;
return proto;
}
@Override
public int hashCode() {
return getProto().hashCode();
}
@Override
public boolean equals(Object other) {
if (other == null)
return false;
if (other.getClass().isAssignableFrom(this.getClass())) {
return this.getProto().equals(this.getClass().cast(other).getProto());
}
return false;
}
@Override
public String toString() {
return TextFormat.shortDebugString(getProto());
}
}

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@ -66,6 +66,8 @@ import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetQueueUserAclsInfoResponse;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationRequest;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesRequest;
import org.apache.hadoop.yarn.api.protocolrecords.MoveApplicationAcrossQueuesResponse;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenRequest;
import org.apache.hadoop.yarn.api.protocolrecords.RenewDelegationTokenResponse;
import org.apache.hadoop.yarn.api.protocolrecords.SubmitApplicationRequest;
@ -719,6 +721,12 @@ public class ClientRMService extends AbstractService implements
throw RPCUtil.getRemoteException(e);
}
}
@Override
public MoveApplicationAcrossQueuesResponse moveApplicationAcrossQueues(
MoveApplicationAcrossQueuesRequest request) throws YarnException {
throw new UnsupportedOperationException("Move not yet supported");
}
private String getRenewerForToken(Token<RMDelegationTokenIdentifier> token)
throws IOException {