| /* |
| * 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.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| 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_ACK2; |
| |
| public class GossipDigestAckVerbHandler extends GossipVerbHandler<GossipDigestAck> |
| { |
| public static final GossipDigestAckVerbHandler instance = new GossipDigestAckVerbHandler(); |
| |
| private static final Logger logger = LoggerFactory.getLogger(GossipDigestAckVerbHandler.class); |
| |
| public void doVerb(Message<GossipDigestAck> message) |
| { |
| InetAddressAndPort from = message.from(); |
| if (logger.isTraceEnabled()) |
| logger.trace("Received a GossipDigestAckMessage from {}", from); |
| if (!Gossiper.instance.isEnabled() && !Gossiper.instance.isInShadowRound()) |
| { |
| if (logger.isTraceEnabled()) |
| logger.trace("Ignoring GossipDigestAckMessage because gossip is disabled"); |
| return; |
| } |
| |
| GossipDigestAck gDigestAckMessage = message.payload; |
| List<GossipDigest> gDigestList = gDigestAckMessage.getGossipDigestList(); |
| Map<InetAddressAndPort, EndpointState> epStateMap = gDigestAckMessage.getEndpointStateMap(); |
| logger.trace("Received ack with {} digests and {} states", gDigestList.size(), epStateMap.size()); |
| |
| if (Gossiper.instance.isInShadowRound()) |
| { |
| if (logger.isDebugEnabled()) |
| logger.debug("Received an ack from {}, which may trigger exit from shadow round", from); |
| |
| // if the ack is completely empty, then we can infer that the respondent is also in a shadow round |
| Gossiper.instance.maybeFinishShadowRound(from, gDigestList.isEmpty() && epStateMap.isEmpty(), epStateMap); |
| return; // don't bother doing anything else, we have what we came for |
| } |
| |
| if (epStateMap.size() > 0) |
| { |
| // Ignore any GossipDigestAck messages that we handle before a regular GossipDigestSyn has been send. |
| // This will prevent Acks from leaking over from the shadow round that are not actual part of |
| // the regular gossip conversation. |
| if ((System.nanoTime() - Gossiper.instance.firstSynSendAt) < 0 || Gossiper.instance.firstSynSendAt == 0) |
| { |
| if (logger.isTraceEnabled()) |
| logger.trace("Ignoring unrequested GossipDigestAck from {}", from); |
| return; |
| } |
| |
| /* Notify the Failure Detector */ |
| Gossiper.instance.notifyFailureDetector(epStateMap); |
| Gossiper.instance.applyStateLocally(epStateMap); |
| } |
| |
| /* Get the state required to send to this gossipee - construct GossipDigestAck2Message */ |
| Map<InetAddressAndPort, EndpointState> deltaEpStateMap = new HashMap<InetAddressAndPort, EndpointState>(); |
| for (GossipDigest gDigest : gDigestList) |
| { |
| InetAddressAndPort addr = gDigest.getEndpoint(); |
| EndpointState localEpStatePtr = Gossiper.instance.getStateForVersionBiggerThan(addr, gDigest.getMaxVersion()); |
| if (localEpStatePtr != null) |
| deltaEpStateMap.put(addr, localEpStatePtr); |
| } |
| |
| Message<GossipDigestAck2> gDigestAck2Message = Message.out(GOSSIP_DIGEST_ACK2, new GossipDigestAck2(deltaEpStateMap)); |
| if (logger.isTraceEnabled()) |
| logger.trace("Sending a GossipDigestAck2Message to {}", from); |
| MessagingService.instance().send(gDigestAck2Message, from); |
| |
| super.doVerb(message); |
| } |
| } |