kafka MetadataSnapshotter 源码
kafka MetadataSnapshotter 代码
文件路径：/core/src/main/scala/kafka/server/metadata/MetadataSnapshotter.scala
/**
* 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 kafka.server.metadata
import org.apache.kafka.image.MetadataImage
import org.apache.kafka.metadata.util.SnapshotReason
/**
* Handles creating snapshots.
*/
trait MetadataSnapshotter {
/**
* If there is no other snapshot being written out, start writing out a snapshot.
*
* @param lastContainedLogTime The highest time contained in the snapshot.
* @param image The metadata image to write out.
* @param reason Set of reasons due to which a snapshot is being taken.
*
* @return True if we will write out a new snapshot; false otherwise.
*/
def maybeStartSnapshot(lastContainedLogTime: Long, image: MetadataImage, reason: Set[SnapshotReason]): Boolean
}
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