Updating Kafka stream to include full alert

Support Lasair
#1

Hi Lasair,

If I change an LSST filter on Lasair from “kafka stream” to “kafka stream with full alert”, do I need to wait for new alerts to be issued for the stream to be updated?

I ask because I updated a filter to include the full alert, but when I go to ping the kafka topic it doesn’t have the alert packet included. From this, I assume my updates are only propagated on future alerts and not repopulated with current alerts?

Thanks!
Chris

#2

Yes, and changing your filter clears your Kafka queue.

#3

Hi Chris
Can I just ask why you want the full alert? Is the lightcurve-lite not sufficient? Theres a quota on output, so with full alerts you won’t get many before the quota kicks in.
Roy

#4

Hi Roy,

Don’t worry, Roy, this isn’t for TiDES!

We held a little local hack session to play around with Lasair recently. One of the example Jupyter notebooks uses the alert packet within the Kafka stream to plot a light curve. We swapped out the filter for one of our own, it didn’t work, realised we need to change the filter to ‘with full alert’ but it still didn’t work.
So we wondered if this update only takes effect on subsequent alerts, which we now know is the case.

Thanks for the swift replies.
Chris