Upgrade druid from 0.9.0 to 0.22.1 (latest version as of now)

Guys,

I have very old version of druid .i.e., 0.9.0 in Production Environment. I need to upgrade it to latest version i.e., 0.22.1 without losing any data.

I am using MySQL for metadata storage and S3 for deep storage.

Can anyone help me on this?

Thanks
Manmohan

I think your best approach will be to test the process on another cluster, rather than do it directly in production.
Ideally you will want to test all of the datasources, but I realize that may be complicated if it is a large cluster.
At a minimum I would suggest:

Let us know how it goes.