arjunashok commented on code in PR #58: URL: https://github.com/apache/cassandra-sidecar/pull/58#discussion_r1310534787
########## adapters/base/src/main/java/org/apache/cassandra/sidecar/adapters/base/TokenRangeReplicaProvider.java: ########## @@ -0,0 +1,263 @@ +/* + * 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.cassandra.sidecar.adapters.base; + +import java.math.BigInteger; +import java.net.UnknownHostException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.function.Function; +import java.util.stream.Collectors; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.cassandra.sidecar.adapters.base.NodeInfo.NodeState; +import org.apache.cassandra.sidecar.common.JmxClient; +import org.apache.cassandra.sidecar.common.data.GossipInfoResponse; +import org.apache.cassandra.sidecar.common.data.TokenRangeReplicasResponse; +import org.apache.cassandra.sidecar.common.data.TokenRangeReplicasResponse.ReplicaInfo; +import org.apache.cassandra.sidecar.common.utils.GossipInfoParser; +import org.jetbrains.annotations.NotNull; + +import static java.util.stream.Collectors.toList; +import static org.apache.cassandra.sidecar.adapters.base.ClusterMembershipJmxOperations.FAILURE_DETECTOR_OBJ_NAME; +import static org.apache.cassandra.sidecar.adapters.base.EndpointSnitchJmxOperations.ENDPOINT_SNITCH_INFO_OBJ_NAME; +import static org.apache.cassandra.sidecar.adapters.base.StorageJmxOperations.STORAGE_SERVICE_OBJ_NAME; +import static org.apache.cassandra.sidecar.adapters.base.TokenRangeReplicas.generateTokenRangeReplicas; + +/** + * Aggregates the replica-set by token range + */ +public class TokenRangeReplicaProvider +{ + private final JmxClient jmxClient; + + private static final Logger LOGGER = LoggerFactory.getLogger(TokenRangeReplicaProvider.class); + + public TokenRangeReplicaProvider(JmxClient jmxClient) + { + this.jmxClient = jmxClient; + } + + public TokenRangeReplicasResponse tokenRangeReplicas(String keyspace, Partitioner partitioner) + { + Objects.requireNonNull(keyspace, "keyspace must be non-null"); + + StorageJmxOperations storage = initializeStorageOps(); + + // Retrieve map of primary token ranges to endpoints that describe the ring topology + Map<List<String>, List<String>> naturalReplicaMappings = storage.getRangeToEndpointWithPortMap(keyspace); + LOGGER.debug("Natural token range mappingsfor keyspace={}, pendingRangeMappings={}", + keyspace, + naturalReplicaMappings); + // Pending ranges include bootstrap tokens and leaving endpoints as represented in the Cassandra TokenMetadata + Map<List<String>, List<String>> pendingRangeMappings = storage.getPendingRangeToEndpointWithPortMap(keyspace); + + LOGGER.debug("Pending token range mappings for keyspace={}, pendingRangeMappings={}", + keyspace, + pendingRangeMappings); + List<TokenRangeReplicas> naturalTokenRangeReplicas = transformRangeMappings(naturalReplicaMappings, + partitioner); + List<TokenRangeReplicas> pendingTokenRangeReplicas = transformRangeMappings(pendingRangeMappings, + partitioner); + + // Merge natural and pending range replicas to generate candidates for write-replicas + List<TokenRangeReplicas> allTokenRangeReplicas = new ArrayList<>(naturalTokenRangeReplicas); + allTokenRangeReplicas.addAll(pendingTokenRangeReplicas); + + Map<String, String> hostToDatacenter = buildHostToDatacenterMapping(allTokenRangeReplicas); + + // Retrieve map of all token ranges (pending & primary) to endpoints + List<ReplicaInfo> writeReplicas = writeReplicasFromPendingRanges(allTokenRangeReplicas, hostToDatacenter); + + List<ReplicaInfo> readReplicas = readReplicasFromReplicaMapping(naturalTokenRangeReplicas, hostToDatacenter); + Map<String, String> replicaToStateMap = replicaToStateMap(allTokenRangeReplicas, storage); + + return new TokenRangeReplicasResponse(replicaToStateMap, + writeReplicas, + readReplicas); + } + + private Map<String, String> replicaToStateMap(List<TokenRangeReplicas> replicaSet, StorageJmxOperations storage) + { + List<String> joiningNodes = storage.getJoiningNodesWithPort(); + List<String> leavingNodes = storage.getLeavingNodesWithPort(); + List<String> movingNodes = storage.getMovingNodesWithPort(); + + String rawGossipInfo = getRawGossipInfo(); + GossipInfoResponse gossipInfo = GossipInfoParser.parse(rawGossipInfo); + + StateWithReplacement state = new StateWithReplacement(joiningNodes, leavingNodes, movingNodes, gossipInfo); + + return replicaSet.stream() + .map(TokenRangeReplicas::replicaSet) + .flatMap(Collection::stream) + .distinct() + .collect(Collectors.toMap(Function.identity(), state::of)); + } + + protected EndpointSnitchJmxOperations initializeEndpointProxy() + { + return jmxClient.proxy(EndpointSnitchJmxOperations.class, ENDPOINT_SNITCH_INFO_OBJ_NAME); + } + + protected StorageJmxOperations initializeStorageOps() + { + return jmxClient.proxy(StorageJmxOperations.class, STORAGE_SERVICE_OBJ_NAME); + } + + + protected String getRawGossipInfo() + { + return jmxClient.proxy(ClusterMembershipJmxOperations.class, FAILURE_DETECTOR_OBJ_NAME) + .getAllEndpointStatesWithPort(); + } + + private List<ReplicaInfo> writeReplicasFromPendingRanges(List<TokenRangeReplicas> tokenRangeReplicaSet, + Map<String, String> hostToDatacenter) + { +// Map<String, String> hostToDatacenter = buildHostToDatacenterMapping(tokenRangeReplicaSet); + // Candidate write-replica mappings are normalized by consolidating overlapping ranges + return TokenRangeReplicas.normalize(tokenRangeReplicaSet).stream() + .map(range -> { + Map<String, List<String>> replicasByDc = + replicasByDataCenter(hostToDatacenter, range.replicaSet()); + return new ReplicaInfo(range.start().toString(), + range.end().toString(), + replicasByDc); + }) + .collect(toList()); + } + + private List<TokenRangeReplicas> transformRangeMappings(Map<List<String>, List<String>> replicaMappings, + Partitioner partitioner) + { + return replicaMappings.entrySet() + .stream() + .map(entry -> generateTokenRangeReplicas(new BigInteger(entry.getKey().get(0)), + new BigInteger(entry.getKey().get(1)), + partitioner, + new HashSet<>(entry.getValue()))) + .flatMap(Collection::stream) + .collect(toList()); + } + + + private List<ReplicaInfo> readReplicasFromReplicaMapping(List<TokenRangeReplicas> naturalTokenRangeReplicas, + Map<String, String> hostToDatacenter) + { + Map<String, String> hostToDatacenter2 = buildHostToDatacenterMapping(naturalTokenRangeReplicas); + return naturalTokenRangeReplicas.stream() + .sorted() + .map(rep -> { + Map<String, List<String>> replicasByDc + = replicasByDataCenter(hostToDatacenter2, rep.replicaSet()); + + return new ReplicaInfo(rep.start().toString(), + rep.end().toString(), + replicasByDc); + }) + .collect(toList()); + } + + private Map<String, String> buildHostToDatacenterMapping(List<TokenRangeReplicas> replicaSet) + { + EndpointSnitchJmxOperations endpointSnitchInfo = initializeEndpointProxy(); + + return replicaSet.stream() + .map(TokenRangeReplicas::replicaSet) + .flatMap(Collection::stream) + .distinct() + .collect(Collectors.toMap(Function.identity(), + (String host) -> getDatacenter(endpointSnitchInfo, host))); + } + + private String getDatacenter(EndpointSnitchJmxOperations endpointSnitchInfo, String host) + { + try + { + return endpointSnitchInfo.getDatacenter(host); + } + catch (UnknownHostException e) + { + throw new RuntimeException(e); + } + } + + @NotNull + private static Map<String, List<String>> replicasByDataCenter(Map<String, String> hostToDatacenter, + Collection<String> replicas) + { + return replicas.stream().collect(Collectors.groupingBy(hostToDatacenter::get, + Collectors.filtering(replicas::contains, toList()))); Review Comment: Addressed -- This is an automated message from the Apache Git Service. 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