Fix min node version before state recovery #86482
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We use the minimum node version in the cluster state to make decisions about backwards compatibility (e.g. to choose newer actions in the REST layer only if all nodes will support it). Once the cluster is fully formed we reject attempts by older nodes to join the cluster so that the minimum node version only ever increases, which makes backwards-compatibility decisions safe. However, it's possible that the REST layer will make decisions about backwards compatibility before the cluster is fully formed. In this state, older nodes may still join the cluster and may therefore see actions that they do not understand. With this commit we report no nodes to the REST layer until the cluster is fully-formed, and change the minimum node version in an empty cluster to be the minimum compatible version. This means the REST layer will operate in a maximally-compatible mode until the cluster is formed. Relates elastic#86405
DaveCTurner
added
>bug
:Core/Infra/REST API
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Pinging @elastic/es-core-infra (Team:Core/Infra) |
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Hi @DaveCTurner, I've created a changelog YAML for you. |
rjernst
reviewed
May 5, 2022
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Oh I see, we pass a supplier around everywhere, so once the cluster state gets updated locally, the next call to any rest handler using it will see the new nodes. |
rjernst
approved these changes
May 5, 2022
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++ yes it's a |
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Thanks both :) |
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We use the minimum node version in the cluster state to make decisions
about backwards compatibility (e.g. to choose newer actions in the REST
layer only if all nodes will support it). Once the cluster is fully
formed we reject attempts by older nodes to join the cluster so that the
minimum node version only ever increases, which makes
backwards-compatibility decisions safe.
However, it's possible that the REST layer will make decisions about
backwards compatibility before the cluster is fully formed. In this
state, older nodes may still join the cluster and may therefore see
actions that they do not understand.
With this commit we report no nodes to the REST layer until the cluster
is fully-formed, and change the minimum node version in an empty cluster
to be the minimum compatible version. This means the REST layer will
operate in a maximally-compatible mode until the cluster is formed.
Relates #86405