// 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": 59,
  "type": "request",
  "listeners": ["controller"],
  "name": "FetchSnapshotRequest",
  // Version 1 adds replica directory id (KIP-853)
  "validVersions": "0-1",
  "flexibleVersions": "0+",
  "fields": [
    { "name": "ClusterId", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null", "taggedVersions": "0+", "tag": 0,
      "about": "The clusterId if known, this is used to validate metadata fetches prior to broker registration." },
    { "name": "ReplicaId", "type": "int32", "versions": "0+", "default": "-1", "entityType": "brokerId",
      "about": "The broker ID of the follower." },
    { "name": "MaxBytes", "type": "int32", "versions": "0+", "default": "0x7fffffff",
      "about": "The maximum bytes to fetch from all of the snapshots." },
    { "name": "Topics", "type": "[]TopicSnapshot", "versions": "0+",
      "about": "The topics to fetch.", "fields": [
        { "name": "Name", "type": "string", "versions": "0+", "entityType": "topicName",
          "about": "The name of the topic to fetch." },
        { "name": "Partitions", "type": "[]PartitionSnapshot", "versions": "0+",
          "about": "The partitions to fetch.", "fields": [
            { "name": "Partition", "type": "int32", "versions": "0+",
              "about": "The partition index." },
            { "name": "CurrentLeaderEpoch", "type": "int32", "versions": "0+",
              "about": "The current leader epoch of the partition, -1 for unknown leader epoch." },
            { "name": "SnapshotId", "type": "SnapshotId", "versions": "0+",
              "about": "The snapshot endOffset and epoch to fetch.", "fields": [
                { "name": "EndOffset", "type": "int64", "versions": "0+",
                  "about": "The end offset of the snapshot."},
                { "name": "Epoch", "type": "int32", "versions": "0+",
                  "about": "The epoch of the snapshot."}
              ]
            },
            { "name": "Position", "type": "int64", "versions": "0+",
              "about": "The byte position within the snapshot to start fetching from." },
            { "name": "ReplicaDirectoryId", "type": "uuid", "versions": "1+", "taggedVersions": "1+", "tag": 0, "ignorable": true,
              "about": "The directory id of the follower fetching." }
          ]
        }
      ]
    }
  ]
}
