Impact of --storage.tsdb.min-block-duration and --storage.tsdb.max-block-duration (for Thanos)

[ssor...@whitepages.com]

I am evaluating integrating Thanos [1] with our Prometheus clusters. The Thanos documentation states: "The --storage.tsdb.min-block-duration and --storage.tsdb.max-block-duration must be set to equal values. The default of 2h is recommended." [2]

We don't currently set those flags for our Prometheus instances. Are there any issues with adding these flags for an existing production Prometheus instance, or removing the flags after they have been added? I see recommendations in the Prometheus issue tracker against adjusting those flags. [3][4] We are using --storage.tsdb.retention=720h.

[1] https://github.com/improbable-eng/thanos

[2] https://github.com/improbable-eng/thanos/blob/904357803f8095c784e5397dc27a1851fda39839/docs/components/sidecar.md

[3] https://github.com/prometheus/prometheus/issues/4302

[4] https://github.com/prometheus/prometheus/issues/4047

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Svend Sorensen

[Brian Brazil]

On 17 July 2018 at 22:41, <ssor...@whitepages.com> wrote:

I am evaluating integrating Thanos [1] with our Prometheus clusters. The Thanos documentation states: "The --storage.tsdb.min-block-duration and --storage.tsdb.max-block-duration must be set to equal values. The default of 2h is recommended." [2]

We don't currently set those flags for our Prometheus instances. Are there any issues with adding these flags for an existing production Prometheus instance, or removing the flags after they have been added? I see recommendations in the Prometheus issue tracker against adjusting those flags. [3][4] We are using --storage.tsdb.retention=720h.

From a Prometheus standpoint these settings exist entirely for our own loadtesting, and should not be changed by users.

Brian

 

[1] https://github.com/improbable-eng/thanos

[2] https://github.com/improbable-eng/thanos/blob/904357803f8095c784e5397dc27a1851fda39839/docs/components/sidecar.md

[3] https://github.com/prometheus/prometheus/issues/4302

[4] https://github.com/prometheus/prometheus/issues/4047

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Svend Sorensen

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Brian Brazil

www.robustperception.io