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7f8db4d8ed
Running a Purge and a Get at the same time could allow an old key to be pulled back into the cache if the request was initiated by a node that had been cleared and sent to a node that hadn't. This patch tries to mitigate this, by adding an additional `generation` field, that keeps track of the number of purges issued. Requests are fulfilled successfully only if boths ends of a request are on the same generation.
48 lines
1.2 KiB
Protocol Buffer
48 lines
1.2 KiB
Protocol Buffer
/*
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Copyright 2012 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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syntax = "proto2";
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option go_package = "github.com/mailgun/groupcache/v2/groupcachepb";
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package groupcachepb;
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message GetRequest {
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required string group = 1;
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required string key = 2; // not actually required/guaranteed to be UTF-8
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required int64 generation = 3;
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}
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message GetResponse {
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optional bytes value = 1;
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optional double minute_qps = 2;
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optional int64 expire = 3;
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optional int64 generation = 4;
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}
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message SetRequest {
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required string group = 1;
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required string key = 2;
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optional bytes value = 3;
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optional int64 expire = 4;
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optional int64 generation = 5;
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}
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service GroupCache {
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rpc Get(GetRequest) returns (GetResponse) {
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};
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}
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