On 18/07/2022 17:21, tejaswini vadlamudi wrote:
Can someone point me to the advantages of using remote-write over
federation?
I understand that remote-write is more of a standard interface in the
monitoring domain.
Are there any handy performance measurements that were observed/recorded?
They are really quite different.
Federation is a way of pulling data from a remote Prometheus into
(generally) a local one. The puller gets to choose how often to pull
data and what data to fetch. If the puller can't fetch the data for any
reason (local/remote outage, network issues, etc.) there will be gaps.
Remote write is a way of pushing data from a Prometheus server to
"something else", which could be another Prometheus or one of the many
things which implement the API (e.g. various databases, Thanos, custom
analytics tools, etc.). For these you get all the data (basically as
soon as it has been scraped) with the ability to do filtering via
relabling. If there is an outage/disconnect data will be queued for a
while (too long and things will get lost) so small issues can be handled
transparently.
So you have a difference in what data you get - either all (filtered)
data or data on a schedule (so in effect a form of built-in
downsampling), and who controls that - either the data source Prometheus
or the destination.
Which is "better" depends on what you are trying to achieve and the
constraints you might have (for example difficulties with accepting
network connections or data storage/transfer limits). Don't forget the
organisation differences too - for remote write adding/changing a
destination (or filter rules) needs changes to every data source
Prometheus where federation is purely controlled at the other end, which
might be a good or bad thing depending on team responsibilities/timings.
--
Stuart Clark
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