一.问题现象,使用flink on yarn 模式,写入数据到clickhouse,但是在yarn 集群充足的情况下一直报:Deployment took more than 60 seconds. Please check if the requested resources are available in the YARN cluster,表面现象是 yarn 集群资源可能不够,实际yarn 集群资源是够用的. 查看flink jobmanager的日志,发现日志中一直在出现如下报错: C…
一直对于maven中解决jar包依赖问题的解决方法纠结不清: 下面这个例子可以说明一个很简单的解决方法: 项目启动报错: Connected to the target VM, address: '127.0.0.1:59412', transport: 'socket' SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/D:/document/repository/org…
项目启动报错: Connected to the target VM, address: '127.0.0.1:59412', transport: 'socket' SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/D:/document/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.10.0/log4j-s…
一月 23, 2015 3:46:13 下午 org.apache.catalina.core.AprLifecycleListener init 信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.…
从服务器端接收数据的时候,那些数据必须以浏览器能够理解的格式来发送. 服务器端的编程语言只能以如下 3 种格式返回数据: HTML XML JSON JSON一种简单的数据格式,比xml更轻巧. JSON是JavaScript原生格式,这意味着在JavaScript中处理JSON数据不需要任何特殊的API或工具包. JSON的规则很简单:对象是一个无序的“‘名称:值’对”集合.一个对象以“{”(左括号)开始,“}”(右括号)结束.每个“名称”后跟一个“:”(冒号):“‘名称/值’对”之间使用“,…