title: Updating/Refreshing side inputs data or passing some additional set of data that can be accessible in transformations while processing main input
body: <p>I am trying to create a streaming dataflow pipeline.
  I need to access some additional data for processing main input received from pubsub. If I use side inputs then after some time period (like 1 day) I need to update the cached side input data.
  Or Is there any way to pass additional data to transformations in the form of list or map so that I can use third party cache manager to refresh this data. </p>
  
  <p>Thanks.</p>