simbadzina commented on code in PR #4311: URL: https://github.com/apache/hadoop/pull/4311#discussion_r964131419
########## hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/FederatedNamespaceIds.java: ########## @@ -0,0 +1,113 @@ +/** + * 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 java.util.Collections; +import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.locks.ReentrantLock; +import org.apache.hadoop.classification.VisibleForTesting; +import org.apache.hadoop.hdfs.NamespaceStateId; +import org.apache.hadoop.ipc.protobuf.RpcHeaderProtos; +import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.RouterFederatedStateProto; +import org.apache.hadoop.thirdparty.protobuf.InvalidProtocolBufferException; +import org.apache.hadoop.thirdparty.protobuf.ByteString; + + +/** + * Collection of last-seen namespace state Ids for a set of namespaces. + * A single NamespaceStateId is shared by all outgoing connections to a particular namespace. + * Router clients share and query the entire collection. + */ +public class FederatedNamespaceIds { + private final Map<String, NamespaceStateId> namespaceIdMap = new ConcurrentHashMap<>(); + private final ReentrantLock lock = new ReentrantLock(); + + public void updateStateUsingRequestHeader(RpcHeaderProtos.RpcRequestHeaderProto header) { + if (header.hasRouterFederatedState()) { + RouterFederatedStateProto federatedState; + try { + federatedState = RouterFederatedStateProto.parseFrom(header.getRouterFederatedState()); + } catch (InvalidProtocolBufferException e) { + throw new RuntimeException(e); + } + lock.lock(); + try { + federatedState.getNamespaceStateIdsMap().forEach((nsId, stateId) -> { + if (!namespaceIdMap.containsKey(nsId)) { + namespaceIdMap.putIfAbsent(nsId, new NamespaceStateId()); + } + namespaceIdMap.get(nsId).update(stateId); + }); + } finally { + lock.unlock(); + } + + } + } + + public void setResponseHeaderState(RpcHeaderProtos.RpcResponseHeaderProto.Builder headerBuilder) { + RouterFederatedStateProto.Builder federatedStateBuilder = + RouterFederatedStateProto.newBuilder(); + lock.lock(); + try { + namespaceIdMap.forEach((k, v) -> federatedStateBuilder.putNamespaceStateIds(k, v.get())); + } finally { + lock.unlock(); + } + headerBuilder.setRouterFederatedState(federatedStateBuilder.build().toByteString()); + } + + public NamespaceStateId getNamespaceId(String nsId) { + lock.lock(); + try { + namespaceIdMap.putIfAbsent(nsId, new NamespaceStateId()); + } finally { + lock.unlock(); + } + return namespaceIdMap.get(nsId); + } + + public void removeNamespaceId(String nsId) { + lock.lock(); + try { + namespaceIdMap.remove(nsId); + } finally { + lock.unlock(); + } + } + + /** + * Utility function to view state of routerFederatedState field in RPC headers. + */ + @VisibleForTesting + public static Map<String, Long> getRouterFederatedStateMap(ByteString byteString) { Review Comment: I now use this class in the RouterRPCClient. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org
