public void setConfig(Config config) {
    if (!this.config.compareAndSet(null, config)) {
      LOG.warn("Attempted to set config, but it was already set");
    }
  }
Set the config to be used by Samza loggers.
Only the config used in the first call to this method will be used. After the first call, this method will do
nothing.
samza-core/src/main/java/org/apache/samza/logging/LoggingContextHolder.java