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// 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.

{
  "apiKey": 8,
  "type": "request",
  "listeners": ["zkBroker", "broker"],
  "name": "OffsetCommitRequest",
  // Version 1 adds timestamp and group membership information, as well as the commit timestamp.
  //
  // Version 2 adds retention time.  It removes the commit timestamp added in version 1.
  //
  // Version 3 and 4 are the same as version 2. 
  //
  // Version 5 removes the retention time, which is now controlled only by a broker configuration.
  //
  // Version 6 adds the leader epoch for fencing.
  //
  // version 7 adds a new field called groupInstanceId to indicate member identity across restarts.
  //
  // Version 8 is the first flexible version.
  "validVersions": "0-8",
  "flexibleVersions": "8+",
  "fields": [
    { "name": "GroupId", "type": "string", "versions": "0+", "entityType": "groupId",
      "about": "The unique group identifier." },
    { "name": "GenerationId", "type": "int32", "versions": "1+", "default": "-1", "ignorable": true,
      "about": "The generation of the group." },
    { "name": "MemberId", "type": "string", "versions": "1+", "ignorable": true,
      "about": "The member ID assigned by the group coordinator." },
    { "name": "GroupInstanceId", "type": "string", "versions": "7+",
      "nullableVersions": "7+", "default": "null",
      "about": "The unique identifier of the consumer instance provided by end user." },
    { "name": "RetentionTimeMs", "type": "int64", "versions": "2-4", "default": "-1", "ignorable": true,
      "about": "The time period in ms to retain the offset." },
    { "name": "Topics", "type": "[]OffsetCommitRequestTopic", "versions": "0+",
      "about": "The topics to commit offsets for.",  "fields": [
      { "name": "Name", "type": "string", "versions": "0+", "entityType": "topicName",
        "about": "The topic name." },
      { "name": "Partitions", "type": "[]OffsetCommitRequestPartition", "versions": "0+",
        "about": "Each partition to commit offsets for.", "fields": [
        { "name": "PartitionIndex", "type": "int32", "versions": "0+",
          "about": "The partition index." },
        { "name": "CommittedOffset", "type": "int64", "versions": "0+",
          "about": "The message offset to be committed." },
        { "name": "CommittedLeaderEpoch", "type": "int32", "versions": "6+", "default": "-1", "ignorable": true,
          "about": "The leader epoch of this partition." },
        // CommitTimestamp has been removed from v2 and later.
        { "name": "CommitTimestamp", "type": "int64", "versions": "1", "default": "-1",
          "about": "The timestamp of the commit." },
        { "name": "CommittedMetadata", "type": "string", "versions": "0+", "nullableVersions": "0+",
          "about": "Any associated metadata the client wants to keep." }
      ]}
    ]}
  ]
}