| /* |
| * 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.gms; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.apache.cassandra.locator.InetAddressAndPort; |
| import org.apache.cassandra.net.Message; |
| import org.apache.cassandra.net.MessagingService; |
| |
| import static org.apache.cassandra.net.Verb.GOSSIP_DIGEST_ACK; |
| |
| public class GossipDigestSynVerbHandler extends GossipVerbHandler<GossipDigestSyn> |
| { |
| public static final GossipDigestSynVerbHandler instance = new GossipDigestSynVerbHandler(); |
| |
| private static final Logger logger = LoggerFactory.getLogger(GossipDigestSynVerbHandler.class); |
| |
| public void doVerb(Message<GossipDigestSyn> message) |
| { |
| InetAddressAndPort from = message.from(); |
| if (logger.isTraceEnabled()) |
| logger.trace("Received a GossipDigestSynMessage from {}", from); |
| if (!Gossiper.instance.isEnabled() && !Gossiper.instance.isInShadowRound()) |
| { |
| if (logger.isTraceEnabled()) |
| logger.trace("Ignoring GossipDigestSynMessage because gossip is disabled"); |
| return; |
| } |
| |
| GossipDigestSyn gDigestMessage = message.payload; |
| /* If the message is from a different cluster throw it away. */ |
| if (!gDigestMessage.clusterId.equals(DatabaseDescriptor.getClusterName())) |
| { |
| logger.warn("ClusterName mismatch from {} {}!={}", from, gDigestMessage.clusterId, DatabaseDescriptor.getClusterName()); |
| return; |
| } |
| |
| if (gDigestMessage.partioner != null && !gDigestMessage.partioner.equals(DatabaseDescriptor.getPartitionerName())) |
| { |
| logger.warn("Partitioner mismatch from {} {}!={}", from, gDigestMessage.partioner, DatabaseDescriptor.getPartitionerName()); |
| return; |
| } |
| |
| List<GossipDigest> gDigestList = gDigestMessage.getGossipDigests(); |
| |
| // if the syn comes from a peer performing a shadow round and this node is |
| // also currently in a shadow round, send back a minimal ack. This node must |
| // be in the sender's seed list and doing this allows the sender to |
| // differentiate between seeds from which it is partitioned and those which |
| // are in their shadow round |
| if (!Gossiper.instance.isEnabled() && Gossiper.instance.isInShadowRound()) |
| { |
| // a genuine syn (as opposed to one from a node currently |
| // doing a shadow round) will always contain > 0 digests |
| if (gDigestList.size() > 0) |
| { |
| logger.debug("Ignoring non-empty GossipDigestSynMessage because currently in gossip shadow round"); |
| return; |
| } |
| |
| logger.debug("Received a shadow round syn from {}. Gossip is disabled but " + |
| "currently also in shadow round, responding with a minimal ack", from); |
| MessagingService.instance() |
| .send(Message.out(GOSSIP_DIGEST_ACK, new GossipDigestAck(Collections.emptyList(), Collections.emptyMap())), |
| from); |
| return; |
| } |
| |
| if (logger.isTraceEnabled()) |
| { |
| StringBuilder sb = new StringBuilder(); |
| for (GossipDigest gDigest : gDigestList) |
| { |
| sb.append(gDigest); |
| sb.append(" "); |
| } |
| logger.trace("Gossip syn digests are : {}", sb); |
| } |
| |
| Message<GossipDigestAck> gDigestAckMessage = gDigestList.isEmpty() ? |
| createShadowReply() : |
| createNormalReply(gDigestList); |
| |
| if (logger.isTraceEnabled()) |
| logger.trace("Sending a GossipDigestAckMessage to {}", from); |
| MessagingService.instance().send(gDigestAckMessage, from); |
| |
| super.doVerb(message); |
| } |
| |
| private static Message<GossipDigestAck> createNormalReply(List<GossipDigest> gDigestList) |
| { |
| List<GossipDigest> deltaGossipDigestList = new ArrayList<>(); |
| Map<InetAddressAndPort, EndpointState> deltaEpStateMap = new HashMap<>(); |
| Gossiper.instance.examineGossiper(gDigestList, deltaGossipDigestList, deltaEpStateMap); |
| logger.trace("sending {} digests and {} deltas", deltaGossipDigestList.size(), deltaEpStateMap.size()); |
| |
| return Message.out(GOSSIP_DIGEST_ACK, new GossipDigestAck(deltaGossipDigestList, deltaEpStateMap)); |
| } |
| |
| private static Message<GossipDigestAck> createShadowReply() |
| { |
| Map<InetAddressAndPort, EndpointState> stateMap = Gossiper.instance.examineShadowState(); |
| logger.trace("sending 0 digests and {} deltas", stateMap.size()); |
| return Message.out(GOSSIP_DIGEST_ACK, new GossipDigestAck(Collections.emptyList(), stateMap)); |
| } |
| } |