#20346

Committed 03 Jul 2026 10:23AM UTC coverage: 89.106% (-0.01%) from 89.118%

Build # #20346

Build Type

push

github

Committed by

web-flow

Commit Message

xds: Move backend service label plumbing to CDS (#12882)

Addresses #12431.

This moves backend service metric label plumbing from `xds_cluster_impl`
to `cds`, matching the A75/A89 aggregate cluster behavior.

Previously, `xds_cluster_impl` added the `grpc.lb.backend_service`
pick-details label and propagated `NameResolver.ATTR_BACKEND_SERVICE` to
its child policy. That works for simple clusters, but it is the wrong
layer after A75 because aggregate clusters need the leaf CDS cluster
name, not the aggregate root cluster name.

This change makes CDS responsible for backend service plumbing:

- non-aggregate CDS adds the `grpc.lb.backend_service` pick-details
label using the CDS cluster name
- non-aggregate CDS propagates `NameResolver.ATTR_BACKEND_SERVICE` to
its child policy, so WRR can consume the backend service context
- aggregate root CDS does not add the backend service attribute or
pick-details label
- leaf CDS instances under an aggregate cluster add their own leaf
cluster name
- `xds_cluster_impl` no longer owns backend service pick-details label
or child attribute propagation

The existing `InternalEquivalentAddressGroup.ATTR_BACKEND_SERVICE` path
is left unchanged for endpoint/subchannel metrics.

Tests cover:

- non-aggregate CDS propagating `NameResolver.ATTR_BACKEND_SERVICE`
- non-aggregate CDS adding `grpc.lb.backend_service`
- aggregate root CDS not adding the root cluster name
- aggregate leaf CDS instances propagating leaf cluster names
- `xds_cluster_impl` no longer adding backend service labels or
attributes
- picker tests using a non-null `PickDetailsConsumer`, matching the real
`PickSubchannelArgs` contract

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95.18

/../xds/src/main/java/io/grpc/xds/ClusterImplLoadBalancer.java

/*
 * Copyright 2020 The gRPC Authors
 *
 * Licensed 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 io.grpc.xds;

import static com.google.common.base.Preconditions.checkNotNull;
import static io.grpc.xds.client.LoadStatsManager2.isEnabledOrcaLrsPropagation;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.MoreObjects;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableMap;
import com.google.protobuf.Struct;
import io.grpc.Attributes;
import io.grpc.ClientStreamTracer;
import io.grpc.ClientStreamTracer.StreamInfo;
import io.grpc.ConnectivityState;
import io.grpc.ConnectivityStateInfo;
import io.grpc.EquivalentAddressGroup;
import io.grpc.InternalLogId;
import io.grpc.LoadBalancer;
import io.grpc.Metadata;
import io.grpc.Status;
import io.grpc.internal.ForwardingClientStreamTracer;
import io.grpc.internal.GrpcUtil;
import io.grpc.services.MetricReport;
import io.grpc.util.ForwardingLoadBalancerHelper;
import io.grpc.util.ForwardingSubchannel;
import io.grpc.util.GracefulSwitchLoadBalancer;
import io.grpc.xds.ClusterImplLoadBalancerProvider.ClusterImplConfig;
import io.grpc.xds.Endpoints.DropOverload;
import io.grpc.xds.EnvoyServerProtoData.UpstreamTlsContext;
import io.grpc.xds.ThreadSafeRandom.ThreadSafeRandomImpl;
import io.grpc.xds.XdsNameResolverProvider.CallCounterProvider;
import io.grpc.xds.client.BackendMetricPropagation;
import io.grpc.xds.client.Bootstrapper.ServerInfo;
import io.grpc.xds.client.LoadStatsManager2.ClusterDropStats;
import io.grpc.xds.client.LoadStatsManager2.ClusterLocalityStats;
import io.grpc.xds.client.Locality;
import io.grpc.xds.client.XdsClient;
import io.grpc.xds.client.XdsLogger;
import io.grpc.xds.client.XdsLogger.XdsLogLevel;
import io.grpc.xds.internal.XdsInternalAttributes;
import io.grpc.xds.internal.security.SecurityProtocolNegotiators;
import io.grpc.xds.internal.security.SslContextProviderSupplier;
import io.grpc.xds.orca.OrcaPerRequestUtil;
import io.grpc.xds.orca.OrcaPerRequestUtil.OrcaPerRequestReportListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import javax.annotation.Nullable;

/**
 * Load balancer for cluster_impl_experimental LB policy. This LB policy is the child LB policy of
 * the priority_experimental LB policy and the parent LB policy of the weighted_target_experimental
 * LB policy in the xDS load balancing hierarchy. This LB policy applies cluster-level
 * configurations to requests sent to the corresponding cluster, such as drop policies, circuit
 * breakers.
 */
final class ClusterImplLoadBalancer extends LoadBalancer {

  @VisibleForTesting
  static final long DEFAULT_PER_CLUSTER_MAX_CONCURRENT_REQUESTS = 1024L;
  @VisibleForTesting
  static boolean enableCircuitBreaking =
      Strings.isNullOrEmpty(System.getenv("GRPC_XDS_EXPERIMENTAL_CIRCUIT_BREAKING"))
          || Boolean.parseBoolean(System.getenv("GRPC_XDS_EXPERIMENTAL_CIRCUIT_BREAKING"));

  private static final Attributes.Key<AtomicReference<ClusterLocality>> ATTR_CLUSTER_LOCALITY =
      Attributes.Key.create("io.grpc.xds.ClusterImplLoadBalancer.clusterLocality");
  @VisibleForTesting
  static final Attributes.Key<String> ATTR_SUBCHANNEL_ADDRESS_NAME =
      Attributes.Key.create("io.grpc.xds.ClusterImplLoadBalancer.addressName");

  private final XdsLogger logger;
  private final Helper helper;
  private final ThreadSafeRandom random;
  // The following fields are effectively final.
  private String cluster;
  @Nullable
  private String edsServiceName;
  private XdsClient xdsClient;
  private CallCounterProvider callCounterProvider;
  private ClusterDropStats dropStats;
  private ClusterImplLbHelper childLbHelper;
  private GracefulSwitchLoadBalancer childSwitchLb;

  ClusterImplLoadBalancer(Helper helper) {
    this(helper, ThreadSafeRandomImpl.instance);
  }

  ClusterImplLoadBalancer(Helper helper, ThreadSafeRandom random) {
    this.helper = checkNotNull(helper, "helper");
    this.random = checkNotNull(random, "random");
    InternalLogId logId = InternalLogId.allocate("cluster-impl-lb", helper.getAuthority());
    logger = XdsLogger.withLogId(logId);
    logger.log(XdsLogLevel.INFO, "Created");
  }

  @Override
  public Status acceptResolvedAddresses(ResolvedAddresses resolvedAddresses) {
    logger.log(XdsLogLevel.DEBUG, "Received resolution result: {0}", resolvedAddresses);
    Attributes attributes = resolvedAddresses.getAttributes();
    if (xdsClient == null) {
      xdsClient = checkNotNull(attributes.get(io.grpc.xds.XdsAttributes.XDS_CLIENT), "xdsClient");
    }
    if (callCounterProvider == null) {
      callCounterProvider = attributes.get(io.grpc.xds.XdsAttributes.CALL_COUNTER_PROVIDER);
    }

    ClusterImplConfig config =
        (ClusterImplConfig) resolvedAddresses.getLoadBalancingPolicyConfig();
    if (config == null) {
      return Status.INTERNAL.withDescription("No cluster configuration found");
    }

    if (cluster == null) {
      cluster = config.cluster;
      edsServiceName = config.edsServiceName;
      childLbHelper = new ClusterImplLbHelper(
          callCounterProvider.getOrCreate(config.cluster, config.edsServiceName),
          config.lrsServerInfo);
      childSwitchLb = new GracefulSwitchLoadBalancer(childLbHelper);
      // Assume load report server does not change throughout cluster lifetime.
      if (config.lrsServerInfo != null) {
        dropStats = xdsClient.addClusterDropStats(config.lrsServerInfo, cluster, edsServiceName);
      }
    }

    childLbHelper.updateDropPolicies(config.dropCategories);
    childLbHelper.updateMaxConcurrentRequests(config.maxConcurrentRequests);
    childLbHelper.updateSslContextProviderSupplier(config.tlsContext);
    childLbHelper.updateFilterMetadata(config.filterMetadata);
    childLbHelper.updateBackendMetricPropagation(config.backendMetricPropagation);

    return childSwitchLb.acceptResolvedAddresses(
        resolvedAddresses.toBuilder()
            .setLoadBalancingPolicyConfig(config.childConfig)
            .build());
  }

  @Override
  public void handleNameResolutionError(Status error) {
    if (childSwitchLb != null) {
      childSwitchLb.handleNameResolutionError(error);
    } else {
      helper.updateBalancingState(
          ConnectivityState.TRANSIENT_FAILURE, new FixedResultPicker(PickResult.withError(error)));
    }
  }

  @Override
  public void requestConnection() {
    if (childSwitchLb != null) {
      childSwitchLb.requestConnection();
    }
  }

  @Override
  public void shutdown() {
    if (dropStats != null) {
      dropStats.release();
    }
    if (childSwitchLb != null) {
      childSwitchLb.shutdown();
      if (childLbHelper != null) {
        childLbHelper.updateSslContextProviderSupplier(null);
        childLbHelper = null;
      }
    }
    xdsClient = null;
  }

  /**
   * A decorated {@link LoadBalancer.Helper} that applies configurations for connections
   * or requests to endpoints in the cluster.
   */
  private final class ClusterImplLbHelper extends ForwardingLoadBalancerHelper {
    private final AtomicLong inFlights;
    private ConnectivityState currentState = ConnectivityState.IDLE;
    private SubchannelPicker currentPicker = new FixedResultPicker(PickResult.withNoResult());
    private List<DropOverload> dropPolicies = Collections.emptyList();
    private long maxConcurrentRequests = DEFAULT_PER_CLUSTER_MAX_CONCURRENT_REQUESTS;
    @Nullable
    private SslContextProviderSupplier sslContextProviderSupplier;
    private Map<String, Struct> filterMetadata = ImmutableMap.of();
    @Nullable
    private final ServerInfo lrsServerInfo;
    @Nullable
    private BackendMetricPropagation backendMetricPropagation;

    private ClusterImplLbHelper(AtomicLong inFlights, @Nullable ServerInfo lrsServerInfo) {
      this.inFlights = checkNotNull(inFlights, "inFlights");
      this.lrsServerInfo = lrsServerInfo;
    }

    @Override
    public void updateBalancingState(ConnectivityState newState, SubchannelPicker newPicker) {
      currentState = newState;
      currentPicker =  newPicker;
      SubchannelPicker picker = new RequestLimitingSubchannelPicker(
          newPicker, dropPolicies, maxConcurrentRequests, filterMetadata);
      delegate().updateBalancingState(newState, picker);
    }

    @Override
    public Subchannel createSubchannel(CreateSubchannelArgs args) {
      List<EquivalentAddressGroup> addresses = withAdditionalAttributes(args.getAddresses());
      // This value for  ClusterLocality is not recommended for general use.
      // Currently, we extract locality data from the first address, even before the subchannel is
      // READY.
      // This is mainly to accommodate scenarios where a Load Balancing API (like "pick first")
      // might return the subchannel before it is READY. Typically, we wouldn't report load for such
      // selections because the channel will disregard the chosen (not-ready) subchannel.
      // However, we needed to ensure this case is handled.
      ClusterLocality clusterLocality = createClusterLocalityFromAttributes(
          args.getAddresses().get(0).getAttributes());
      AtomicReference<ClusterLocality> localityAtomicReference = new AtomicReference<>(
          clusterLocality);
      Attributes.Builder attrsBuilder = args.getAttributes().toBuilder()
          .set(ATTR_CLUSTER_LOCALITY, localityAtomicReference);
      if (GrpcUtil.getFlag("GRPC_EXPERIMENTAL_XDS_AUTHORITY_REWRITE", false)) {
        String hostname = args.getAddresses().get(0).getAttributes()
            .get(XdsInternalAttributes.ATTR_ADDRESS_NAME);
        if (hostname != null) {
          attrsBuilder.set(ATTR_SUBCHANNEL_ADDRESS_NAME, hostname);
        }
      }
      args = args.toBuilder().setAddresses(addresses).setAttributes(attrsBuilder.build()).build();
      final Subchannel subchannel = delegate().createSubchannel(args);

      return new ClusterImplSubchannel(subchannel, localityAtomicReference);
    }

    private final class ClusterImplSubchannel extends ForwardingSubchannel {
      private final Subchannel delegate;
      private final AtomicReference<ClusterLocality> localityAtomicReference;

      private ClusterImplSubchannel(
          Subchannel delegate, AtomicReference<ClusterLocality> localityAtomicReference) {
        this.delegate = delegate;
        this.localityAtomicReference = localityAtomicReference;
      }

      @Override
      public void start(SubchannelStateListener listener) {
        delegate().start(
            new SubchannelStateListener() {
              @Override
              public void onSubchannelState(ConnectivityStateInfo newState) {
                // Do nothing if LB has been shutdown
                if (xdsClient != null && newState.getState().equals(ConnectivityState.READY)) {
                  // Get locality based on the connected address attributes
                  ClusterLocality updatedClusterLocality =
                      createClusterLocalityFromAttributes(
                          delegate.getConnectedAddressAttributes());
                  ClusterLocality oldClusterLocality =
                      localityAtomicReference.getAndSet(updatedClusterLocality);
                  oldClusterLocality.release();
                }
                listener.onSubchannelState(newState);
              }
            });
      }

      @Override
      public void shutdown() {
        localityAtomicReference.get().release();
        delegate().shutdown();
      }

      @Override
      public void updateAddresses(List<EquivalentAddressGroup> addresses) {
        delegate().updateAddresses(withAdditionalAttributes(addresses));
      }

      @Override
      protected Subchannel delegate() {
        return delegate;
      }
    }

    private List<EquivalentAddressGroup> withAdditionalAttributes(
        List<EquivalentAddressGroup> addresses) {
      List<EquivalentAddressGroup> newAddresses = new ArrayList<>();
      for (EquivalentAddressGroup eag : addresses) {
        Attributes.Builder attrBuilder = eag.getAttributes().toBuilder().set(
            io.grpc.xds.XdsAttributes.ATTR_CLUSTER_NAME, cluster);
        if (sslContextProviderSupplier != null) {
          attrBuilder.set(
              SecurityProtocolNegotiators.ATTR_SSL_CONTEXT_PROVIDER_SUPPLIER,
              sslContextProviderSupplier);
        }
        newAddresses.add(new EquivalentAddressGroup(eag.getAddresses(), attrBuilder.build()));
      }
      return newAddresses;
    }

    private ClusterLocality createClusterLocalityFromAttributes(Attributes addressAttributes) {
      Locality locality = addressAttributes.get(io.grpc.xds.XdsAttributes.ATTR_LOCALITY);
      String localityName = addressAttributes.get(EquivalentAddressGroup.ATTR_LOCALITY_NAME);

      // Endpoint addresses resolved by ClusterResolverLoadBalancer should always contain
      // attributes with its locality, including endpoints in LOGICAL_DNS clusters.
      // In case of not (which really shouldn't), loads are aggregated under an empty
      // locality.
      if (locality == null) {
        locality = Locality.create("", "", "");
        localityName = "";
      }

      final ClusterLocalityStats localityStats =
          (lrsServerInfo == null)
              ? null
              : xdsClient.addClusterLocalityStats(lrsServerInfo, cluster,
                  edsServiceName, locality, backendMetricPropagation);

      return new ClusterLocality(localityStats, localityName);
    }

    @Override
    protected Helper delegate()  {
      return helper;
    }

    private void updateDropPolicies(List<DropOverload> dropOverloads) {
      if (!dropPolicies.equals(dropOverloads)) {
        dropPolicies = dropOverloads;
        updateBalancingState(currentState, currentPicker);
      }
    }

    private void updateMaxConcurrentRequests(@Nullable Long maxConcurrentRequests) {
      if (Objects.equals(this.maxConcurrentRequests, maxConcurrentRequests)) {
        return;
      }
      this.maxConcurrentRequests =
          maxConcurrentRequests != null
              ? maxConcurrentRequests
              : DEFAULT_PER_CLUSTER_MAX_CONCURRENT_REQUESTS;
      updateBalancingState(currentState, currentPicker);
    }

    private void updateSslContextProviderSupplier(@Nullable UpstreamTlsContext tlsContext) {
      UpstreamTlsContext currentTlsContext =
          sslContextProviderSupplier != null
              ? (UpstreamTlsContext)sslContextProviderSupplier.getTlsContext()
              : null;
      if (Objects.equals(currentTlsContext,  tlsContext)) {
        return;
      }
      if (sslContextProviderSupplier != null) {
        sslContextProviderSupplier.close();
      }
      sslContextProviderSupplier =
          tlsContext != null
              ? new SslContextProviderSupplier(tlsContext,
                                               (TlsContextManager) xdsClient.getSecurityConfig())
              : null;
    }

    private void updateFilterMetadata(Map<String, Struct> filterMetadata) {
      this.filterMetadata = ImmutableMap.copyOf(filterMetadata);
    }

    private void updateBackendMetricPropagation(
        @Nullable BackendMetricPropagation backendMetricPropagation) {
      this.backendMetricPropagation = backendMetricPropagation;
    }

    private class RequestLimitingSubchannelPicker extends SubchannelPicker {
      private final SubchannelPicker delegate;
      private final List<DropOverload> dropPolicies;
      private final long maxConcurrentRequests;
      private final Map<String, Struct> filterMetadata;

      private RequestLimitingSubchannelPicker(SubchannelPicker delegate,
          List<DropOverload> dropPolicies, long maxConcurrentRequests,
          Map<String, Struct> filterMetadata) {
        this.delegate = delegate;
        this.dropPolicies = dropPolicies;
        this.maxConcurrentRequests = maxConcurrentRequests;
        this.filterMetadata = checkNotNull(filterMetadata, "filterMetadata");
      }

      @Override
      public PickResult pickSubchannel(PickSubchannelArgs args) {
        args.getCallOptions().getOption(ClusterImplLoadBalancerProvider.FILTER_METADATA_CONSUMER)
            .accept(filterMetadata);
        for (DropOverload dropOverload : dropPolicies) {
          int rand = random.nextInt(1_000_000);
          if (rand < dropOverload.dropsPerMillion()) {
            logger.log(XdsLogLevel.INFO, "Drop request with category: {0}",
                dropOverload.category());
            if (dropStats != null) {
              dropStats.recordDroppedRequest(dropOverload.category());
            }
            return PickResult.withDrop(
                Status.UNAVAILABLE.withDescription("Dropped: " + dropOverload.category()));
          }
        }
        PickResult result = delegate.pickSubchannel(args);
        if (result.getStatus().isOk() && result.getSubchannel() != null) {
          Subchannel subchannel = result.getSubchannel();
          if (subchannel instanceof ClusterImplLbHelper.ClusterImplSubchannel) {
            subchannel = ((ClusterImplLbHelper.ClusterImplSubchannel) subchannel).delegate();
            result = result.copyWithSubchannel(subchannel);
          }
          if (enableCircuitBreaking) {
            if (inFlights.get() >= maxConcurrentRequests) {
              if (dropStats != null) {
                dropStats.recordDroppedRequest();
              }
              return PickResult.withDrop(Status.UNAVAILABLE.withDescription(
                  String.format(Locale.US, "Cluster max concurrent requests limit of %d exceeded",
                      maxConcurrentRequests)));
            }
          }
          final AtomicReference<ClusterLocality> clusterLocality =
              result.getSubchannel().getAttributes().get(ATTR_CLUSTER_LOCALITY);

          if (clusterLocality != null) {
            ClusterLocalityStats stats = clusterLocality.get().getClusterLocalityStats();
            if (stats != null) {
              String localityName =
                  result.getSubchannel().getAttributes().get(ATTR_CLUSTER_LOCALITY).get()
                      .getClusterLocalityName();
              args.getPickDetailsConsumer().addOptionalLabel("grpc.lb.locality", localityName);

              ClientStreamTracer.Factory tracerFactory = new CountingStreamTracerFactory(
                  stats, inFlights, result.getStreamTracerFactory());
              ClientStreamTracer.Factory orcaTracerFactory = OrcaPerRequestUtil.getInstance()
                  .newOrcaClientStreamTracerFactory(tracerFactory, new OrcaPerRpcListener(stats));
              result = result.copyWithStreamTracerFactory(orcaTracerFactory);
            }
          }
          if (args.getCallOptions().getOption(XdsNameResolver.AUTO_HOST_REWRITE_KEY) != null
              && args.getCallOptions().getOption(XdsNameResolver.AUTO_HOST_REWRITE_KEY)) {
            result = PickResult.withSubchannel(result.getSubchannel(),
                result.getStreamTracerFactory(),
                result.getSubchannel().getAttributes().get(ATTR_SUBCHANNEL_ADDRESS_NAME));
          }
        }
        return result;
      }

      @Override
      public String toString() {
        return MoreObjects.toStringHelper(this).add("delegate", delegate).toString();
      }
    }
  }

  private static final class CountingStreamTracerFactory extends
      ClientStreamTracer.Factory {
    private final ClusterLocalityStats stats;
    private final AtomicLong inFlights;
    @Nullable
    private final ClientStreamTracer.Factory delegate;

    private CountingStreamTracerFactory(
        ClusterLocalityStats stats, AtomicLong inFlights,
        @Nullable ClientStreamTracer.Factory delegate) {
      this.stats = checkNotNull(stats, "stats");
      this.inFlights = checkNotNull(inFlights, "inFlights");
      this.delegate = delegate;
    }

    @Override
    public ClientStreamTracer newClientStreamTracer(StreamInfo info, Metadata headers) {
      stats.recordCallStarted();
      inFlights.incrementAndGet();
      if (delegate == null) {
        return new ClientStreamTracer() {
          @Override
          public void streamClosed(Status status) {
            stats.recordCallFinished(status);
            inFlights.decrementAndGet();
          }
        };
      }
      final ClientStreamTracer delegatedTracer = delegate.newClientStreamTracer(info, headers);
      return new ForwardingClientStreamTracer() {
        @Override
        protected ClientStreamTracer delegate() {
          return delegatedTracer;
        }

        @Override
        public void streamClosed(Status status) {
          stats.recordCallFinished(status);
          inFlights.decrementAndGet();
          delegate().streamClosed(status);
        }
      };
    }
  }

  private static final class OrcaPerRpcListener implements OrcaPerRequestReportListener {

    private final ClusterLocalityStats stats;

    private OrcaPerRpcListener(ClusterLocalityStats stats) {
      this.stats = checkNotNull(stats, "stats");
    }

    /**
     * Copies ORCA metrics from {@link MetricReport} to {@link ClusterLocalityStats}
     * such that they are included in the snapshot for the LRS report sent to the LRS server.
     * This includes both top-level metrics (CPU, memory, application utilization) and named
     * metrics, filtered according to the backend metric propagation configuration.
     */
    @Override
    public void onLoadReport(MetricReport report) {
      if (isEnabledOrcaLrsPropagation) {
        stats.recordTopLevelMetrics(
            report.getCpuUtilization(),
            report.getMemoryUtilization(),
            report.getApplicationUtilization());
      }
      stats.recordBackendLoadMetricStats(report.getNamedMetrics());
    }
  }

  /**
   * Represents the {@link ClusterLocalityStats} and network locality name of a cluster.
   */
  static final class ClusterLocality {
    private final ClusterLocalityStats clusterLocalityStats;
    private final String clusterLocalityName;

    @VisibleForTesting
    ClusterLocality(ClusterLocalityStats localityStats, String localityName) {
      this.clusterLocalityStats = localityStats;
      this.clusterLocalityName = localityName;
    }

    ClusterLocalityStats getClusterLocalityStats() {
      return clusterLocalityStats;
    }

    String getClusterLocalityName() {
      return clusterLocalityName;
    }

    @VisibleForTesting
    void release() {
      if (clusterLocalityStats != null) {
        clusterLocalityStats.release();
      }
    }
  }
}

grpc / grpc-java / #20346

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