Consul go api: WaitIndex in QueryOptions struct

[Andreas]

Hi,

I just want to verify that setting WaitIndex to 0 means that the request will not block?
If so, does this mean that X-Consul-Index can never be 0?

Thanks!

[Kyle Havlovitz]

Hi Andreas, that's correct - the X-Consul-Index will never be 0 because there's a few things that get written to the state store when Consul starts up for the first time, such as the Autopilot config. This causes the index to increment, so it effectively will never be 0.

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[pba...@hashicorp.com]

Also note that if you GET a KV or service etc that doesn't exist, you'll still see a ModifiedIndex (and X-Consul-Index) that is always greater than zero allowing you to use that in a blocking watch to wait for it to show up.

On Tuesday, February 20, 2018 at 9:44:08 PM UTC, Kyle Havlovitz wrote:

Hi Andreas, that's correct - the X-Consul-Index will never be 0 because there's a few things that get written to the state store when Consul starts up for the first time, such as the Autopilot config. This causes the index to increment, so it effectively will never be 0.

On Tue, Feb 20, 2018 at 5:54 AM, Andreas <mrho...@gmail.com> wrote:

Hi,

I just want to verify that setting WaitIndex to 0 means that the request will not block?
If so, does this mean that X-Consul-Index can never be 0?

Thanks!

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