Data loss after updating tranquility

Hey guys,

Today we have updated and restarted tranquility in order to add new elements to our schema. After this, we see the new data coming in, but all the previous data doesn’t show up when we query. We haven’t restarted any other Druid service except for Tranquility.

Do you know what could be the issue or if we have done something wrong?

Thank you for your help!


After some debugging, we found that the coordinator console would show a lot of tasks being stuck at the queue and we figured that something was wrong with the middle-manager/historical node. After restarting the node it all started to behave as expected.

Could updating Tranquility have such an effect on the data node, or could this be coincidental?