kafka FailureReason 源码
kafka FailureReason 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/query/FailureReason.java
/*
* 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.kafka.streams.query;
import org.apache.kafka.common.annotation.InterfaceStability.Evolving;
/**
* This enumeration type captures the various top-level reasons that a particular
* partition of a store would fail to execute a query. Stores should generally
* respond with a failure message instead of throwing an exception.
* <p>
* Intended to be used in {@link QueryResult#forFailure(FailureReason, String)}.
*/
@Evolving
public enum FailureReason {
/**
* Failure indicating that the store doesn't know how to handle the given query.
*/
UNKNOWN_QUERY_TYPE,
/**
* The query required to execute on an active task (via {@link StateQueryRequest#requireActive()}),
* but while executing the query, the task was either a Standby task, or it was an Active task
* not in the RUNNING state. The failure message will contain the reason for the failure.
* <p>
* The caller should either try again later or try a different replica.
*/
NOT_ACTIVE,
/**
* Failure indicating that the store partition is not (yet) up to the desired bound. The caller
* should either try again later or try a different replica.
*/
NOT_UP_TO_BOUND,
/**
* Failure indicating that the requested store partition is not present on the local
* KafkaStreams instance. It may have been migrated to another instance during a rebalance. The
* caller is recommended to try a different replica.
*/
NOT_PRESENT,
/**
* The requested store partition does not exist at all. For example, partition 4 was requested,
* but the store in question only has 4 partitions (0 through 3).
*/
DOES_NOT_EXIST,
/**
* The store that handled the query got an exception during query execution. The message
* will contain the exception details. Depending on the nature of the exception, the caller
* may be able to retry this instance or may need to try a different instance.
*/
STORE_EXCEPTION;
}
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