Flink 开发教程网址
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| 序号 | 网址 | 内容介绍 | 备注 |
| 1 | https://blog.csdn.net/LangLang1111111/article/details/121531354 | Keyed state can only be used on a 'keyed stream', i.e., after a 'keyBy()' operation. | |
| 2 | https://blog.csdn.net/yang_shibiao/article/details/122739655 | BroadcastState的使用教程 | |
| 3 | https://blog.csdn.net/xjsj62728/article/details/144144030 | JAVA-收集器 | |
| 4 | https://yangshibiao.blog.csdn.net/category_11148369_2.html | csdn-flink开发教程 | |
| 5 | https://www.cnblogs.com/johnnyzen/p/18645358 | flink job运行超时 | |
1 出现如下错误信息:
java.lang.NullPointerException: Keyed state can only be used on a 'keyed stream', i.e., after a 'keyBy()' operation.
at org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:76)
at org.apache.flink.streaming.api.operators.StreamingRuntimeContext.checkPreconditionsAndGetKeyedStateStore(StreamingRuntimeContext.java:238)
at org.apache.flink.streaming.api.operators.StreamingRuntimeContext.getMapState(StreamingRuntimeContext.java:230)
java.lang.NullPointerException: Keyed state can only be used on a 'keyed str
2 出现如下错误信息
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