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Posted to user-zh@flink.apache.org by allanqinjy <al...@163.com> on 2021/03/11 14:50:15 UTC
回复： Flink savepoint迁移问题
建云，
之前我也遇到了savepoint 起作业失败的问题，是我们升级pulsar客户端以后，从2.2升级到2.5.2，我-s 启动作业的时候。因为作业也不是很重要，当时手头有其他任务，我就没有关注这个问题。你看看pulsar source那儿是不是做了什么。
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allanqinjy
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allanqinjy@163.com
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签名由网易邮箱大师定制
在2021年03月11日 22:43，Kezhu Wang<ke...@gmail.com> 写道：
有没有可能flink在读取savepoint文件时，就做了反序列化，在这个过程中失败了。
确实是这样的，checkpoint 把 serializer 也 snapshot 了。
重新看了下 stack，应该是 deserialize `MessageId` 的时候出错的。你可以看下，pulsar
的版本是不是也有变动？有的话，这两个版本之间的某个 `MessageId` 实现是不是有字段变动？感觉你们应该用
`MessageId.toByteArray`。
On March 11, 2021 at 20:26:15, 赵 建云 (zhaojianyun88@outlook.com) wrote:
你好，我参考StatefulSinkWriterOperator重写了迁移方法，进行测试，还是遇到了上面的错误。 这个错误似乎发生在source的
initializeState之前。有没有可能flink在读取savepoint文件时，就做了反序列化，在这个过程中失败了。请问有什么办法能帮忙定位吗？
感谢~
2021年3月11日 上午11:36，Kezhu Wang <ke...@gmail.com> 写道：
新的集群使用的是更新之后的 pulsar connector ？我看了下 pulsar-flink 的代码，这个更新对 state 是破坏性的。
+ unionOffsetStates = stateStore.getUnionListState(
+ new ListStateDescriptor<>(
+ OFFSETS_STATE_NAME,
+ TypeInformation.of(new TypeHint<Tuple3<String,
MessageId, String>>() {
+ })));
解决方法 :?
1. 尝试通过 state-processor-api 重写下 state ?
2. 1.9 的 pulsar-flink connector 可以跑在 1.11 的 flink 上吗？
感觉后面还有不兼容的更新
new ListStateDescriptor<>(
OFFSETS_STATE_NAME,
- TypeInformation.of(new TypeHint<Tuple3<String,
MessageId, String>>() {
+ TypeInformation.of(new TypeHint<Tuple3<TopicRange,
MessageId, String>>() {
})));
不兼容的 state 更新，如果不好做 schema migration，可以试试 StatefulSinkWriterOperator
的方法：同时读取新旧 state + 只写新 state。
可以等 streamnative 的人确认下。
On March 11, 2021 at 10:43:53, 赵 建云 (zhaojianyun88@outlook.com) wrote:
社区各位大佬，我遇到了一个Flink版本升级后，savepoint不会正确恢复问题。
版本从1.9.3 升级到1.11.0或1.11.3.
连接器使用的pulsar的连接器。在Source的checkpoint数据结构如下
oldUnionOffsetStates = stateStore.getUnionListState(
new ListStateDescriptor<>(
OFFSETS_STATE_NAME,
TypeInformation.of(new TypeHint<Tuple2<String, MessageId>>() {
})));
oldUnionSubscriptionNameStates =
stateStore.getUnionListState(
new ListStateDescriptor<>(
OFFSETS_STATE_NAME + "_subName",
TypeInformation.of(new TypeHint<String>() {
})));
我在本地通过bin/flink savepoint 命令保存下1.9.3的state，然后停止flink
1.9.3的集群，启动1.11.3的flink集群，使用bin/flink run -s 参数恢复任务。
任务在启动后，会遇到下面的错误
2021-03-11 10:02:25
java.lang.Exception: Exception while creating StreamOperatorStateContext.
at
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:222)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:248)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:290)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$1(StreamTask.java:506)
at
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:92)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:475)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:526)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: org.apache.flink.util.FlinkException: Could not restore operator
state backend for StreamSource_15541fe0b20ca4f01df784b178a8cc9d_(1/1) from
any of the 1 provided restore options.
at
org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
at
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.operatorStateBackend(StreamTaskStateInitializerImpl.java:283)
at
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:156)
... 9 more
Caused by: org.apache.flink.runtime.state.BackendBuildingException: Failed
when trying to restore operator state backend
at
org.apache.flink.runtime.state.DefaultOperatorStateBackendBuilder.build(DefaultOperatorStateBackendBuilder.java:86)
at
org.apache.flink.runtime.state.memory.MemoryStateBackend.createOperatorStateBackend(MemoryStateBackend.java:314)
at
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$operatorStateBackend$0(StreamTaskStateInitializerImpl.java:274)
at
org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:142)
at
org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:121)
... 11 more
Caused by: java.io
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<http://java.io
<https://apac01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fjava.io%2F&data=04%7C01%7C%7C06cd7ca48a8f481f58d708d8e43ed127%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637510305734217175%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=VU%2Bgy0%2B6u%2BVe0Qj1maU3nvijfSH9hBdQApSnfFjq9G8%3D&reserved=0>>.EOFException:
No more bytes left.
at
org.apache.flink.api.java.typeutils.runtime.NoFetchingInput.require(NoFetchingInput.java:79)
at com.esotericsoftware.kryo.io
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<http://com.esotericsoftware.kryo.io
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.Input.readVarInt(Input.java:355)
at com.esotericsoftware.kryo.io
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<http://com.esotericsoftware.kryo.io
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.Input.readInt(Input.java:350)
at
com.esotericsoftware.kryo.serializers.UnsafeCacheFields$UnsafeIntField.read(UnsafeCacheFields.java:46)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
at
org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize(KryoSerializer.java:346)
at
org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:151)
at
org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:37)
at
org.apache.flink.runtime.state.OperatorStateRestoreOperation.deserializeOperatorStateValues(OperatorStateRestoreOperation.java:191)
at
org.apache.flink.runtime.state.OperatorStateRestoreOperation.restore(OperatorStateRestoreOperation.java:165)
at
org.apache.flink.runtime.state.DefaultOperatorStateBackendBuilder.build(DefaultOperatorStateBackendBuilder.java:83)
... 15 more
请问题大佬们可以提供排查问题的办法或者解决方案吗？
Jianyun8023
2021-3-11