YARN-11374. [Federation] Support refreshSuperUserGroupsConfiguration、refreshUserToGroupsMappings API's for Federation. (#5193)

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slfan1989 2023-01-13 07:04:09 +08:00 committed by GitHub
parent 1263e024b9
commit 4520448327
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8 changed files with 372 additions and 27 deletions

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@ -33,4 +33,27 @@ public static RefreshSuperUserGroupsConfigurationRequest newInstance() {
Records.newRecord(RefreshSuperUserGroupsConfigurationRequest.class);
return request;
}
@Public
@Stable
public static RefreshSuperUserGroupsConfigurationRequest newInstance(String subClusterId) {
RefreshSuperUserGroupsConfigurationRequest request =
Records.newRecord(RefreshSuperUserGroupsConfigurationRequest.class);
request.setSubClusterId(subClusterId);
return request;
}
/**
* Get the subClusterId.
*
* @return subClusterId.
*/
public abstract String getSubClusterId();
/**
* Set the subClusterId.
*
* @param subClusterId subCluster Id.
*/
public abstract void setSubClusterId(String subClusterId);
}

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@ -33,4 +33,27 @@ public static RefreshUserToGroupsMappingsRequest newInstance() {
Records.newRecord(RefreshUserToGroupsMappingsRequest.class);
return request;
}
@Public
@Stable
public static RefreshUserToGroupsMappingsRequest newInstance(String subClusterId) {
RefreshUserToGroupsMappingsRequest request =
Records.newRecord(RefreshUserToGroupsMappingsRequest.class);
request.setSubClusterId(subClusterId);
return request;
}
/**
* Get the subClusterId.
*
* @return subClusterId.
*/
public abstract String getSubClusterId();
/**
* Set the subClusterId.
*
* @param subClusterId subCluster Id.
*/
public abstract void setSubClusterId(String subClusterId);
}

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@ -46,11 +46,13 @@ message RefreshNodesResponseProto {
}
message RefreshSuperUserGroupsConfigurationRequestProto {
optional string sub_cluster_id = 1;
}
message RefreshSuperUserGroupsConfigurationResponseProto {
}
message RefreshUserToGroupsMappingsRequestProto {
optional string sub_cluster_id = 1;
}
message RefreshUserToGroupsMappingsResponseProto {
}

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@ -18,8 +18,10 @@
package org.apache.hadoop.yarn.server.api.protocolrecords.impl.pb;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.RefreshSuperUserGroupsConfigurationRequestProtoOrBuilder;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.RefreshSuperUserGroupsConfigurationRequestProto;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshSuperUserGroupsConfigurationRequest;
@ -27,18 +29,20 @@
@Private
@Unstable
public class RefreshSuperUserGroupsConfigurationRequestPBImpl
extends RefreshSuperUserGroupsConfigurationRequest {
public class RefreshSuperUserGroupsConfigurationRequestPBImpl
extends RefreshSuperUserGroupsConfigurationRequest {
RefreshSuperUserGroupsConfigurationRequestProto proto = RefreshSuperUserGroupsConfigurationRequestProto.getDefaultInstance();
RefreshSuperUserGroupsConfigurationRequestProto.Builder builder = null;
boolean viaProto = false;
private RefreshSuperUserGroupsConfigurationRequestProto proto =
RefreshSuperUserGroupsConfigurationRequestProto.getDefaultInstance();
private RefreshSuperUserGroupsConfigurationRequestProto.Builder builder = null;
private boolean viaProto = false;
public RefreshSuperUserGroupsConfigurationRequestPBImpl() {
builder = RefreshSuperUserGroupsConfigurationRequestProto.newBuilder();
}
public RefreshSuperUserGroupsConfigurationRequestPBImpl(RefreshSuperUserGroupsConfigurationRequestProto proto) {
public RefreshSuperUserGroupsConfigurationRequestPBImpl(
RefreshSuperUserGroupsConfigurationRequestProto proto) {
this.proto = proto;
viaProto = true;
}
@ -56,16 +60,46 @@ public int hashCode() {
@Override
public boolean equals(Object other) {
if (other == null)
if (!(other instanceof RefreshSuperUserGroupsConfigurationRequest)) {
return false;
if (other.getClass().isAssignableFrom(this.getClass())) {
return this.getProto().equals(this.getClass().cast(other).getProto());
}
return false;
RefreshSuperUserGroupsConfigurationRequestPBImpl otherImpl = this.getClass().cast(other);
return new EqualsBuilder()
.append(this.getProto(), otherImpl.getProto())
.isEquals();
}
@Override
public String toString() {
return TextFormat.shortDebugString(getProto());
}
private synchronized void maybeInitBuilder() {
if (viaProto || builder == null) {
builder = RefreshSuperUserGroupsConfigurationRequestProto.newBuilder(proto);
}
viaProto = false;
}
@Override
public String getSubClusterId() {
RefreshSuperUserGroupsConfigurationRequestProtoOrBuilder p = viaProto ? proto : builder;
boolean hasSubClusterId = p.hasSubClusterId();
if (hasSubClusterId) {
return p.getSubClusterId();
}
return null;
}
@Override
public void setSubClusterId(String subClusterId) {
maybeInitBuilder();
if (subClusterId == null) {
builder.clearSubClusterId();
return;
}
builder.setSubClusterId(subClusterId);
}
}

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@ -18,8 +18,10 @@
package org.apache.hadoop.yarn.server.api.protocolrecords.impl.pb;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.RefreshUserToGroupsMappingsRequestProtoOrBuilder;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.RefreshUserToGroupsMappingsRequestProto;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshUserToGroupsMappingsRequest;
@ -27,12 +29,12 @@
@Private
@Unstable
public class RefreshUserToGroupsMappingsRequestPBImpl
extends RefreshUserToGroupsMappingsRequest {
public class RefreshUserToGroupsMappingsRequestPBImpl extends RefreshUserToGroupsMappingsRequest {
RefreshUserToGroupsMappingsRequestProto proto = RefreshUserToGroupsMappingsRequestProto.getDefaultInstance();
RefreshUserToGroupsMappingsRequestProto.Builder builder = null;
boolean viaProto = false;
private RefreshUserToGroupsMappingsRequestProto proto =
RefreshUserToGroupsMappingsRequestProto.getDefaultInstance();
private RefreshUserToGroupsMappingsRequestProto.Builder builder = null;
private boolean viaProto = false;
public RefreshUserToGroupsMappingsRequestPBImpl() {
builder = RefreshUserToGroupsMappingsRequestProto.newBuilder();
@ -56,16 +58,46 @@ public int hashCode() {
@Override
public boolean equals(Object other) {
if (other == null)
if (!(other instanceof RefreshUserToGroupsMappingsRequest)) {
return false;
if (other.getClass().isAssignableFrom(this.getClass())) {
return this.getProto().equals(this.getClass().cast(other).getProto());
}
return false;
RefreshUserToGroupsMappingsRequestPBImpl otherImpl = this.getClass().cast(other);
return new EqualsBuilder()
.append(this.getProto(), otherImpl.getProto())
.isEquals();
}
@Override
public String toString() {
return TextFormat.shortDebugString(getProto());
}
private synchronized void maybeInitBuilder() {
if (viaProto || builder == null) {
builder = RefreshUserToGroupsMappingsRequestProto.newBuilder(proto);
}
viaProto = false;
}
@Override
public String getSubClusterId() {
RefreshUserToGroupsMappingsRequestProtoOrBuilder p = viaProto ? proto : builder;
boolean hasSubClusterId = p.hasSubClusterId();
if (hasSubClusterId) {
return p.getSubClusterId();
}
return null;
}
@Override
public void setSubClusterId(String subClusterId) {
maybeInitBuilder();
if (subClusterId == null) {
builder.clearSubClusterId();
return;
}
builder.setSubClusterId(subClusterId);
}
}

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@ -135,6 +135,10 @@ public final class RouterMetrics {
private MutableGaugeInt numRenewDelegationTokenFailedRetrieved;
@Metric("# of renewDelegationToken failed to be retrieved")
private MutableGaugeInt numCancelDelegationTokenFailedRetrieved;
@Metric("# of refreshSuperUserGroupsConfiguration failed to be retrieved")
private MutableGaugeInt numRefreshSuperUserGroupsConfigurationFailedRetrieved;
@Metric("# of refreshUserToGroupsMappings failed to be retrieved")
private MutableGaugeInt numRefreshUserToGroupsMappingsFailedRetrieved;
// Aggregate metrics are shared, and don't have to be looked up per call
@Metric("Total number of successful Submitted apps and latency(ms)")
@ -231,6 +235,10 @@ public final class RouterMetrics {
private MutableRate totalSucceededRenewDelegationTokenRetrieved;
@Metric("Total number of successful Retrieved CancelDelegationToken and latency(ms)")
private MutableRate totalSucceededCancelDelegationTokenRetrieved;
@Metric("Total number of successful Retrieved RefreshSuperUserGroupsConfig and latency(ms)")
private MutableRate totalSucceededRefreshSuperUserGroupsConfigurationRetrieved;
@Metric("Total number of successful Retrieved RefreshUserToGroupsMappings and latency(ms)")
private MutableRate totalSucceededRefreshUserToGroupsMappingsRetrieved;
/**
* Provide quantile counters for all latencies.
@ -282,6 +290,8 @@ public final class RouterMetrics {
private MutableQuantiles getDelegationTokenLatency;
private MutableQuantiles renewDelegationTokenLatency;
private MutableQuantiles cancelDelegationTokenLatency;
private MutableQuantiles refreshSuperUserGroupsConfLatency;
private MutableQuantiles refreshUserToGroupsMappingsLatency;
private static volatile RouterMetrics instance = null;
private static MetricsRegistry registry;
@ -456,6 +466,11 @@ private RouterMetrics() {
cancelDelegationTokenLatency = registry.newQuantiles("cancelDelegationTokenLatency",
"latency of cancel delegation token timeouts", "ops", "latency", 10);
refreshSuperUserGroupsConfLatency = registry.newQuantiles("refreshSuperUserGroupsConfLatency",
"latency of refresh superuser groups configuration timeouts", "ops", "latency", 10);
refreshUserToGroupsMappingsLatency = registry.newQuantiles("refreshUserToGroupsMappingsLatency",
"latency of refresh user to groups mappings timeouts", "ops", "latency", 10);
}
public static RouterMetrics getMetrics() {
@ -712,6 +727,11 @@ public long getNumSucceededCancelDelegationTokenRetrieved() {
return totalSucceededCancelDelegationTokenRetrieved.lastStat().numSamples();
}
@VisibleForTesting
public long getNumSucceededRefreshSuperUserGroupsConfigurationRetrieved() {
return totalSucceededRefreshSuperUserGroupsConfigurationRetrieved.lastStat().numSamples();
}
@VisibleForTesting
public double getLatencySucceededAppsCreated() {
return totalSucceededAppsCreated.lastStat().mean();
@ -947,6 +967,11 @@ public double getLatencySucceededCancelDelegationTokenRetrieved() {
return totalSucceededCancelDelegationTokenRetrieved.lastStat().mean();
}
@VisibleForTesting
public double getLatencySucceededRefreshSuperUserGroupsConfigurationRetrieved() {
return totalSucceededRefreshSuperUserGroupsConfigurationRetrieved.lastStat().mean();
}
@VisibleForTesting
public int getAppsFailedCreated() {
return numAppsFailedCreated.value();
@ -1145,6 +1170,14 @@ public int getNumRefreshNodesFailedRetrieved() {
return numRefreshNodesFailedRetrieved.value();
}
public int getNumRefreshSuperUserGroupsConfigurationFailedRetrieved() {
return numRefreshSuperUserGroupsConfigurationFailedRetrieved.value();
}
public int getNumRefreshUserToGroupsMappingsFailedRetrieved() {
return numRefreshUserToGroupsMappingsFailedRetrieved.value();
}
public int getDelegationTokenFailedRetrieved() {
return numGetDelegationTokenFailedRetrieved.value();
}
@ -1392,6 +1425,16 @@ public void succeededCancelDelegationTokenRetrieved(long duration) {
cancelDelegationTokenLatency.add(duration);
}
public void succeededRefreshSuperUserGroupsConfRetrieved(long duration) {
totalSucceededRefreshSuperUserGroupsConfigurationRetrieved.add(duration);
refreshSuperUserGroupsConfLatency.add(duration);
}
public void succeededRefreshUserToGroupsMappingsRetrieved(long duration) {
totalSucceededRefreshUserToGroupsMappingsRetrieved.add(duration);
refreshUserToGroupsMappingsLatency.add(duration);
}
public void incrAppsFailedCreated() {
numAppsFailedCreated.incr();
}
@ -1568,6 +1611,14 @@ public void incrRefreshNodesFailedRetrieved() {
numRefreshNodesFailedRetrieved.incr();
}
public void incrRefreshSuperUserGroupsConfigurationFailedRetrieved() {
numRefreshSuperUserGroupsConfigurationFailedRetrieved.incr();
}
public void incrRefreshUserToGroupsMappingsFailedRetrieved() {
numRefreshUserToGroupsMappingsFailedRetrieved.incr();
}
public void incrGetDelegationTokenFailedRetrieved() {
numGetDelegationTokenFailedRetrieved.incr();
}

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@ -192,7 +192,8 @@ public RefreshQueuesResponse refreshQueues(RefreshQueuesRequest request)
}
} catch (YarnException e) {
routerMetrics.incrRefreshQueuesFailedRetrieved();
RouterServerUtil.logAndThrowException(e, "Unable to refreshQueue due to exception.");
RouterServerUtil.logAndThrowException(e,
"Unable to refreshQueue due to exception. " + e.getMessage());
}
routerMetrics.incrRefreshQueuesFailedRetrieved();
@ -245,25 +246,127 @@ public RefreshNodesResponse refreshNodes(RefreshNodesRequest request)
}
} catch (YarnException e) {
routerMetrics.incrRefreshNodesFailedRetrieved();
RouterServerUtil.logAndThrowException(e, "Unable to refreshNodes due to exception.");
RouterServerUtil.logAndThrowException(e,
"Unable to refreshNodes due to exception. " + e.getMessage());
}
routerMetrics.incrRefreshNodesFailedRetrieved();
throw new YarnException("Unable to refreshNodes.");
throw new YarnException("Unable to refreshNodes due to exception.");
}
/**
* Refresh SuperUserGroupsConfiguration requests.
*
* The Router supports refreshing all subCluster SuperUserGroupsConfiguration at once,
* and also supports refreshing SuperUserGroupsConfiguration by SubCluster.
*
* @param request RefreshSuperUserGroupsConfigurationRequest,
* If subClusterId is not empty, it means that we want to
* refresh the superuser groups configuration of the specified subClusterId.
* If subClusterId is empty, it means we want to
* refresh all subCluster superuser groups configuration.
*
* @return RefreshSuperUserGroupsConfigurationResponse,
* There is no specific information in the response, as long as it is not empty,
* it means that the request is successful.
*
* @throws StandbyException exception thrown by non-active server.
* @throws YarnException indicates exceptions from yarn servers.
* @throws IOException io error occurs.
*/
@Override
public RefreshSuperUserGroupsConfigurationResponse refreshSuperUserGroupsConfiguration(
RefreshSuperUserGroupsConfigurationRequest request)
throws StandbyException, YarnException, IOException {
throw new NotImplementedException();
// parameter verification.
if (request == null) {
routerMetrics.incrRefreshSuperUserGroupsConfigurationFailedRetrieved();
RouterServerUtil.logAndThrowException("Missing RefreshSuperUserGroupsConfiguration request.",
null);
}
// call refreshSuperUserGroupsConfiguration of activeSubClusters.
try {
long startTime = clock.getTime();
RMAdminProtocolMethod remoteMethod = new RMAdminProtocolMethod(
new Class[] {RefreshSuperUserGroupsConfigurationRequest.class}, new Object[] {request});
String subClusterId = request.getSubClusterId();
Collection<RefreshSuperUserGroupsConfigurationResponse> refreshSuperUserGroupsConfResps =
remoteMethod.invokeConcurrent(this, RefreshSuperUserGroupsConfigurationResponse.class,
subClusterId);
if (CollectionUtils.isNotEmpty(refreshSuperUserGroupsConfResps)) {
long stopTime = clock.getTime();
routerMetrics.succeededRefreshSuperUserGroupsConfRetrieved(stopTime - startTime);
return RefreshSuperUserGroupsConfigurationResponse.newInstance();
}
} catch (YarnException e) {
routerMetrics.incrRefreshSuperUserGroupsConfigurationFailedRetrieved();
RouterServerUtil.logAndThrowException(e,
"Unable to refreshSuperUserGroupsConfiguration due to exception. " + e.getMessage());
}
routerMetrics.incrRefreshSuperUserGroupsConfigurationFailedRetrieved();
throw new YarnException("Unable to refreshSuperUserGroupsConfiguration.");
}
/**
* Refresh UserToGroupsMappings requests.
*
* The Router supports refreshing all subCluster UserToGroupsMappings at once,
* and also supports refreshing UserToGroupsMappings by subCluster.
*
* @param request RefreshUserToGroupsMappingsRequest,
* If subClusterId is not empty, it means that we want to
* refresh the user groups mapping of the specified subClusterId.
* If subClusterId is empty, it means we want to
* refresh all subCluster user groups mapping.
*
* @return RefreshUserToGroupsMappingsResponse,
* There is no specific information in the response, as long as it is not empty,
* it means that the request is successful.
*
* @throws StandbyException exception thrown by non-active server.
* @throws YarnException indicates exceptions from yarn servers.
* @throws IOException io error occurs.
*/
@Override
public RefreshUserToGroupsMappingsResponse refreshUserToGroupsMappings(
RefreshUserToGroupsMappingsRequest request)
throws StandbyException, YarnException, IOException {
throw new NotImplementedException();
RefreshUserToGroupsMappingsRequest request) throws StandbyException, YarnException,
IOException {
// parameter verification.
if (request == null) {
routerMetrics.incrRefreshUserToGroupsMappingsFailedRetrieved();
RouterServerUtil.logAndThrowException("Missing RefreshUserToGroupsMappings request.", null);
}
// call refreshUserToGroupsMappings of activeSubClusters.
try {
long startTime = clock.getTime();
RMAdminProtocolMethod remoteMethod = new RMAdminProtocolMethod(
new Class[] {RefreshUserToGroupsMappingsRequest.class}, new Object[] {request});
String subClusterId = request.getSubClusterId();
Collection<RefreshUserToGroupsMappingsResponse> refreshUserToGroupsMappingsResps =
remoteMethod.invokeConcurrent(this, RefreshUserToGroupsMappingsResponse.class,
subClusterId);
if (CollectionUtils.isNotEmpty(refreshUserToGroupsMappingsResps)) {
long stopTime = clock.getTime();
routerMetrics.succeededRefreshUserToGroupsMappingsRetrieved(stopTime - startTime);
return RefreshUserToGroupsMappingsResponse.newInstance();
}
} catch (YarnException e) {
routerMetrics.incrRefreshUserToGroupsMappingsFailedRetrieved();
RouterServerUtil.logAndThrowException(e,
"Unable to refreshUserToGroupsMappings due to exception. " + e.getMessage());
}
routerMetrics.incrRefreshUserToGroupsMappingsFailedRetrieved();
throw new YarnException("Unable to refreshUserToGroupsMappings.");
}
@Override

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@ -25,6 +25,11 @@
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshNodesRequest;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshQueuesRequest;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshQueuesResponse;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshSuperUserGroupsConfigurationRequest;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshSuperUserGroupsConfigurationResponse;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshUserToGroupsMappingsRequest;
import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshUserToGroupsMappingsResponse;
import org.apache.hadoop.yarn.server.federation.store.impl.MemoryFederationStateStore;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
import org.apache.hadoop.yarn.server.federation.utils.FederationStateStoreFacade;
@ -37,6 +42,8 @@
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.assertNotNull;
/**
* Extends the FederationRMAdminInterceptor and overrides methods to provide a
* testable implementation of FederationRMAdminInterceptor.
@ -128,7 +135,8 @@ public void testRefreshQueues() throws Exception {
// normal request.
RefreshQueuesRequest request = RefreshQueuesRequest.newInstance();
interceptor.refreshQueues(request);
RefreshQueuesResponse response = interceptor.refreshQueues(request);
assertNotNull(response);
}
@Test
@ -182,4 +190,73 @@ public void testSC1RefreshNodes() throws Exception {
"subClusterId = SC-NON is not an active subCluster.",
() -> interceptor.refreshNodes(request1));
}
@Test
public void testRefreshSuperUserGroupsConfiguration() throws Exception {
// null request.
LambdaTestUtils.intercept(YarnException.class,
"Missing RefreshSuperUserGroupsConfiguration request.",
() -> interceptor.refreshSuperUserGroupsConfiguration(null));
// normal request.
// There is no return information defined in RefreshSuperUserGroupsConfigurationResponse,
// as long as it is not empty, it means that the command is successfully executed.
RefreshSuperUserGroupsConfigurationRequest request =
RefreshSuperUserGroupsConfigurationRequest.newInstance();
RefreshSuperUserGroupsConfigurationResponse response =
interceptor.refreshSuperUserGroupsConfiguration(request);
assertNotNull(response);
}
@Test
public void testSC1RefreshSuperUserGroupsConfiguration() throws Exception {
// case 1, test the existing subCluster (SC-1).
String existSubCluster = "SC-1";
RefreshSuperUserGroupsConfigurationRequest request =
RefreshSuperUserGroupsConfigurationRequest.newInstance(existSubCluster);
RefreshSuperUserGroupsConfigurationResponse response =
interceptor.refreshSuperUserGroupsConfiguration(request);
assertNotNull(response);
// case 2, test the non-exist subCluster.
String notExistsSubCluster = "SC-NON";
RefreshSuperUserGroupsConfigurationRequest request1 =
RefreshSuperUserGroupsConfigurationRequest.newInstance(notExistsSubCluster);
LambdaTestUtils.intercept(Exception.class,
"subClusterId = SC-NON is not an active subCluster.",
() -> interceptor.refreshSuperUserGroupsConfiguration(request1));
}
@Test
public void testRefreshUserToGroupsMappings() throws Exception {
// null request.
LambdaTestUtils.intercept(YarnException.class,
"Missing RefreshUserToGroupsMappings request.",
() -> interceptor.refreshUserToGroupsMappings(null));
// normal request.
RefreshUserToGroupsMappingsRequest request = RefreshUserToGroupsMappingsRequest.newInstance();
RefreshUserToGroupsMappingsResponse response = interceptor.refreshUserToGroupsMappings(request);
assertNotNull(response);
}
@Test
public void testSC1RefreshUserToGroupsMappings() throws Exception {
// case 1, test the existing subCluster (SC-1).
String existSubCluster = "SC-1";
RefreshUserToGroupsMappingsRequest request =
RefreshUserToGroupsMappingsRequest.newInstance(existSubCluster);
RefreshUserToGroupsMappingsResponse response =
interceptor.refreshUserToGroupsMappings(request);
assertNotNull(response);
// case 2, test the non-exist subCluster.
String notExistsSubCluster = "SC-NON";
RefreshUserToGroupsMappingsRequest request1 =
RefreshUserToGroupsMappingsRequest.newInstance(notExistsSubCluster);
LambdaTestUtils.intercept(Exception.class,
"subClusterId = SC-NON is not an active subCluster.",
() -> interceptor.refreshUserToGroupsMappings(request1));
}
}