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HDFS-13522: Add federated nameservices states to client protocol and …
…propagate it between routers and clients. Fixes apache#4311 Signed-off-by: Owen O'Malley <oomalley@linkedin.com>
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103 changes: 103 additions & 0 deletions
103
...f/src/main/java/org/apache/hadoop/hdfs/server/federation/router/PoolAlignmentContext.java
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| @@ -0,0 +1,103 @@ | ||
| /** | ||
| * 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. | ||
| */ | ||
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| package org.apache.hadoop.hdfs.server.federation.router; | ||
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| import java.io.IOException; | ||
| import java.util.concurrent.atomic.LongAccumulator; | ||
| import org.apache.hadoop.ipc.AlignmentContext; | ||
| import org.apache.hadoop.ipc.protobuf.RpcHeaderProtos; | ||
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| /** | ||
| * An alignment context shared by all connections in a {@link ConnectionPool}. | ||
| * There is a distinct connection pool for each [namespace,UGI] pairing. | ||
| * <p> | ||
| * {@link #sharedGlobalStateId} is a reference to a | ||
| * shared {@link LongAccumulator} object in the {@link RouterStateIdContext}. | ||
| * {@link #poolLocalStateId} is specific to each PoolAlignmentContext. | ||
| * <p> | ||
| * The shared {@link #sharedGlobalStateId} is updated only using | ||
| * responses from NameNodes, so clients cannot poison it. | ||
| * {@link #poolLocalStateId} is used to propagate client observed | ||
| * state into NameNode requests. A misbehaving client can poison this but the effect is only | ||
| * visible to other clients with the same UGI and accessing the same namespace. | ||
| */ | ||
| public class PoolAlignmentContext implements AlignmentContext { | ||
| private LongAccumulator sharedGlobalStateId; | ||
| private LongAccumulator poolLocalStateId; | ||
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| PoolAlignmentContext(RouterStateIdContext routerStateIdContext, String namespaceId) { | ||
| sharedGlobalStateId = routerStateIdContext.getNamespaceStateId(namespaceId); | ||
| poolLocalStateId = new LongAccumulator(Math::max, Long.MIN_VALUE); | ||
| } | ||
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| /** | ||
| * Client side implementation only receives state alignment info. | ||
| * It does not provide state alignment info therefore this does nothing. | ||
| */ | ||
| @Override | ||
| public void updateResponseState(RpcHeaderProtos.RpcResponseHeaderProto.Builder header) { | ||
| // Do nothing. | ||
| } | ||
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| /** | ||
| * Router updates a globally shared value using response from | ||
| * namenodes. | ||
| */ | ||
| @Override | ||
| public void receiveResponseState(RpcHeaderProtos.RpcResponseHeaderProto header) { | ||
| sharedGlobalStateId.accumulate(header.getStateId()); | ||
| } | ||
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| /** | ||
| * Client side implementation for routers to provide state info in requests to | ||
| * namenodes. | ||
| */ | ||
| @Override | ||
| public void updateRequestState(RpcHeaderProtos.RpcRequestHeaderProto.Builder header) { | ||
| long maxStateId = Long.max(poolLocalStateId.get(), sharedGlobalStateId.get()); | ||
| header.setStateId(maxStateId); | ||
| } | ||
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| /** | ||
| * Client side implementation only provides state alignment info in requests. | ||
| * Client does not receive RPC requests therefore this does nothing. | ||
| */ | ||
| @Override | ||
| public long receiveRequestState(RpcHeaderProtos.RpcRequestHeaderProto header, long threshold) | ||
| throws IOException { | ||
| // Do nothing. | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public long getLastSeenStateId() { | ||
| return sharedGlobalStateId.get(); | ||
| } | ||
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| @Override | ||
| public boolean isCoordinatedCall(String protocolName, String method) { | ||
| throw new UnsupportedOperationException( | ||
| "Client should not be checking uncoordinated call"); | ||
| } | ||
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| public void advanceClientStateId(Long clientStateId) { | ||
| poolLocalStateId.accumulate(clientStateId); | ||
| } | ||
| } |
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