Can we rollback from randomUID to incremental UID

[dilipdevaraj-sfdc]

Hi TSDB Community,

• We are using OpenTSDB with incremental UID right now, and are planning to switch to metrics randomUID to reduce HBase hotspotting. Is this what the community suggests ?
  -http://opentsdb.net/docs/build/html/user_guide/writing.html#random-metric-uid-assignment
  (The last line reads "UID change is not backwards compatible so you have to create a new table and migrate your old data.")
  It was not clear if we can rollback from randomUID to incremental UID without any migration of tsdb table data ?
• Has anyone experienced any issues/performance problems when using randomUID since it retries max 10 times when there is a collision, before failing.

Thanks.

[manolama]

While you can rollback to the incremental version it will fail when a UID has already been allocated. We'd need to add a bit of code to retry the incrementals as well. Wouldn't be hard to do though.

For the performance problems, with a fairly large space you shouldn't see too many collisions and they should be resolved pretty quickly.