1:先前测试过使用stopWithSavepoint时会将之前成功保存的checkpoint数据给删除掉,后来我们查看了下源码,里面描述如下,就是调用该方法时Flink会将程序设置成Finished态的,可能和实际使用场景有出入。
/**
 * Stops a program on Flink cluster whose job-manager is configured in this 
client's configuration.
 * Stopping works only for streaming programs. Be aware, that the program might 
continue to run for
 * a while after sending the stop command, because after sources stopped to 
emit data all operators
 * need to finish processing.
 *
 * @param jobId the job ID of the streaming program to stop
 * @param advanceToEndOfEventTime flag indicating if the source should inject a 
{@code MAX_WATERMARK} in the pipeline
 * @param savepointDirectory directory the savepoint should be written to
 * @return a {@link CompletableFuture} containing the path where the savepoint 
is located
 */

CompletableFuture<String> stopWithSavepoint(final JobID jobId, final boolean 
advanceToEndOfEventTime, @Nullable final String savepointDirectory);

















在 2021-01-17 16:48:22,"Congxian Qiu" <qcx978132...@gmail.com> 写道:
>Hi
>    你可以看一下是不是 作业的状态变成了 FINISH 了,现在 Flink 在 FINISH 的时候,会删除 checkpoint(就算设置了
>retain on cancel 也会删除)
>    PS :FLINK-18263 正在讨论是否在 Job 变为 FINISH 状态后保留 checkpoint
>[1] https://issues.apache.org/jira/browse/FLINK-18263
>Best,
>Congxian
>
>
>yinghua...@163.com <yinghua...@163.com> 于2021年1月15日周五 上午11:23写道:
>
>> 感谢您的答复,今天我使用cancelWithSavepoint时也还是删除了,通过你的答复知道机制如此,我再使用另外的参数来观察下。
>>
>>
>>
>> yinghua...@163.com
>>
>> 发件人: Yun Tang
>> 发送时间: 2021-01-15 11:02
>> 收件人: user-zh
>> 主题: Re: 回复: 请教个Flink checkpoint的问题
>> Hi
>>
>> 这是因为在Flink-1.7.0 之后,savepoint也被当做是retained checkpoint了 [1],当你stop with
>> savepoint 成功时,新的savepoint创建之后,旧的checkpoint因为默认retain
>> checkpoint的数量为1而被subsume掉了,也就是被删掉了。
>>
>> 如果你还想保留之前的一个旧的checkpoint,可以将默认retain的checkpoint数目设置为2 [2]。
>>
>> 另外说一句,即使是已经deprecated的cancel with
>> savepoint的用法,当新的savepoint创建成功后,旧的checkpoint在默认情况下也应该会被删除,除非增大retain的checkpoint数量。
>>
>>
>> [1] https://issues.apache.org/jira/browse/FLINK-10354
>> [2]
>> https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/state/checkpointing.html#state-checkpoints-num-retained
>>
>> 祝好
>> 唐云
>> ________________________________
>> From: yinghua...@163.com <yinghua...@163.com>
>> Sent: Thursday, January 14, 2021 19:00
>> To: user-zh <user-zh@flink.apache.org>
>> Subject: 回复: 回复: 请教个Flink checkpoint的问题
>>
>> 好的,感谢您的回复!
>>
>>
>>
>> yinghua...@163.com
>>
>> 发件人: Evan
>> 发送时间: 2021-01-14 18:48
>> 收件人: user-zh
>> 主题: 回复: 回复: 请教个Flink checkpoint的问题
>> 是的,应该是机制问题,链接[1]打开有这样一句解释:
>>
>> If you choose to retain externalized checkpoints on cancellation you have
>> to handle checkpoint clean up manually when you cancel the job as well
>> (terminating with job status JobStatus#CANCELED).
>>
>> [1]
>> https://ci.apache.org/projects/flink/flink-docs-release-1.12/zh/deployment/config.html#execution-checkpointing-externalized-checkpoint-retention
>>
>> 如回答有误,请指正。
>>
>>
>>
>>
>>
>> 发件人: yinghua...@163.com
>> 发送时间: 2021-01-14 18:02
>> 收件人: user-zh
>> 主题: 回复: 回复: 请教个Flink checkpoint的问题
>> 代码如下:
>>     streamEnv.enableCheckpointing(5 * 60 * 1000);
>>     CheckpointConfig checkPointConfig = streamEnv.getCheckpointConfig();
>>     checkPointConfig.setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
>>     checkPointConfig.setCheckpointTimeout(1 * 60 * 1000);
>>     checkPointConfig.setMinPauseBetweenCheckpoints((1 * 30 * 1000));
>>     checkPointConfig.setMaxConcurrentCheckpoints(1);
>>     checkPointConfig.setTolerableCheckpointFailureNumber(3);
>>     checkPointConfig
>>
>> .enableExternalizedCheckpoints(ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION);
>>
>>     String checkpointPath = this.execOptions.get(CHECKPOINT_PATH);
>>     try {
>>       StateBackend rocksDBStateBackend = new
>> RocksDBStateBackend(checkpointPath);
>>       streamEnv.setStateBackend(rocksDBStateBackend);
>>
>>
>>
>> yinghua...@163.com
>> 发件人: Evan
>> 发送时间: 2021-01-14 17:55
>> 收件人: user-zh
>> 主题: 回复: 请教个Flink checkpoint的问题
>> 代码图挂掉了,看不到代码
>> 发件人: yinghua...@163.com
>> 发送时间: 2021-01-14 17:26
>> 收件人: user-zh
>> 主题: 请教个Flink checkpoint的问题
>>
>> 我在yarn上提交任务时,设置flink的checkpoint是5分钟一次,checkpoint使用RocksDBStateBackend保存在HDFS上且任务取消后不删除checkpoint,代码如下
>>
>> 现在我发现,当我停止任务时使用stopWithSavepoint发现任务停止后把最近一次的checkpoint信息给删除了?目前机制是这样的吗还是我使用有问题?是不是调用cancelWithSavepoint停止任务时就不会删除最近一次的checkpoint信息?
>> yinghua...@163.com
>>

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