Your assumption is right (thats what I intend to do). My driver code will be in Java. The link sent by Kevin is a API reference to websocket. I understand how websockets works in general but my question was more geared towards seeing the end to end path on how front end dashboard gets updated in realtime. when we collect the data back to the driver program and finished writing data to websocket client the websocket connection terminate right so 1) is Spark driver program something that needs to run for ever like a typical server? if not, 2) then do we need to open a web socket connection each time when the task terminates?
On Thu, Aug 25, 2016 6:06 AM, Sivakumaran S siva.kuma...@me.com wrote: I am assuming that you are doing some calculations over a time window. At the end of the calculations (using RDDs or SQL), once you have collected the data back to the driver program, you format the data in the way your client (dashboard) requires it and write it to the websocket. Is your driver code in Python? The link Kevin has sent should start you off. Regards, Sivakumaran On 25-Aug-2016, at 11:53 AM, kant kodali < kanth...@gmail.com > wrote: yes for now it will be Spark Streaming Job but later it may change. On Thu, Aug 25, 2016 2:37 AM, Sivakumaran S siva.kuma...@me.com wrote: Is this a Spark Streaming job? Regards, Sivakumaran S @Sivakumaran when you say create a web socket object in your spark code I assume you meant a spark "task" opening websocket connection from one of the worker machines to some node.js server in that case the websocket connection terminates after the spark task is completed right ? and when new data comes in a new task gets created and opens a new websocket connection again…is that how it should be On 25-Aug-2016, at 7:08 AM, kant kodali < kanth...@gmail.com > wrote: @Sivakumaran when you say create a web socket object in your spark code I assume you meant a spark "task" opening websocket connection from one of the worker machines to some node.js server in that case the websocket connection terminates after the spark task is completed right ? and when new data comes in a new task gets created and opens a new websocket connection again…is that how it should be? On Wed, Aug 24, 2016 10:38 PM, Sivakumaran S siva.kuma...@me.com wrote: You create a websocket object in your spark code and write your data to the socket. You create a websocket object in your dashboard code and receive the data in realtime and update the dashboard. You can use Node.js in your dashboard ( socket.io ). I am sure there are other ways too. Does that help? Sivakumaran S On 25-Aug-2016, at 6:30 AM, kant kodali < kanth...@gmail.com > wrote: so I would need to open a websocket connection from spark worker machine to where? On Wed, Aug 24, 2016 8:51 PM, Kevin Mellott kevin.r.mell...@gmail.com wrote: In the diagram you referenced, a real-time dashboard can be created using WebSockets. This technology essentially allows your web page to keep an active line of communication between the client and server, in which case you can detect and display new information without requiring any user input of page refreshes. The link below contains additional information on this concept, as well as links to several different implementations (based on your programming language preferences). https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API Hope this helps! - Kevin On Wed, Aug 24, 2016 at 3:52 PM, kant kodali < kanth...@gmail.com > wrote: ---------- Forwarded message ---------- From: kant kodali < kanth...@gmail.com > Date: Wed, Aug 24, 2016 at 1:49 PM Subject: quick question To: d...@spark.apache.org , us...@spark.apache.org <attachment-1.png> In this picture what does "Dashboards" really mean? is there a open source project which can allow me to push the results back to Dashboards such that Dashboards are always in sync with real time updates? (a push based solution is better than poll but i am open to whatever is possible given the above picture)
