如何从compileInFn中编写日志消息？

Question

如何从MapGroupCompiler中的compileInFn编写调试消息？ 使用ContextAwareLogger我收到序列化错误。

（像这样：

class Compiler(context: DriverContext, compilerConf: CompilerConfig)
  extends MapGroupCompiler[IntermediateData]
  with CompileOut1To1Fn[IntermediateData]
  with LayerDefinitions {

private val log = new ContextAwareLogger(this.getClass)
...
}

）

Answer 1

我只需要使用ContextLogging扩展

class Compiler(context: DriverContext, compilerConf: CompilerConfig)
  extends MapGroupCompiler[IntermediateData]
  with ContextLogging     // <--
  with CompileOut1To1Fn[IntermediateData]
  with LayerDefinitions {

  private val log = new ContextAwareLogger(this.getClass)

  ...