Behavior while scaling cluster

Hi,

I'm looking for information regarding cluster behavior while scaling. What I've seen in my tests is that query performance is severely impacted (I'd call it downtime) for a couple of minutes when initiating both a scale-out and scale-in.

Is there any official information on the behavior while scaling?

Azure Data Explorer (Kusto)

Cluster Management

gabil
May 03, 2019
abergs

Hi,

During scaling operations that cluster goes through deployment; therefore it is not answering queries for a short time and does not ingest data. The data queued for ingestion will be ingested as soon as the cluster is up again.

I'll add this to one of our official docs.

Thanks,

Gabi

3 Replies

gabil
Microsoft
May 03, 2019
abergs

Hi,

During scaling operations that cluster goes through deployment; therefore it is not answering queries for a short time and does not ingest data. The data queued for ingestion will be ingested as soon as the cluster is up again.

I'll add this to one of our official docs.

Thanks,

Gabi
- abergs
  Copper Contributor
  May 03, 2019
  Follow up question: Is the ingestion endpoint affected by this re-deployment (with failures) or is the ingestion simply queued and delayed?
  - gabil
    Microsoft
    May 03, 2019
    abergs
    
    The ingestion is delayed until the cluster is up and running and then it continues from the same point.
    
    Thanks,
    
    Gabi

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Behavior while scaling cluster

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