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Implement single node downgrades #13405

Merged
merged 6 commits into from
Oct 29, 2021
Merged

Implement single node downgrades #13405

merged 6 commits into from
Oct 29, 2021

Commits on Oct 29, 2021

  1. server: Depend only on cluster version to detect downgrade 

    Problem with old code was that during downgrade only members with
downgrade target version were allowed to join. This is unrealistic as
it doesn't handle any members to disconnect/rejoin.
    @serathius
    serathius committed Oct 29, 2021
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  2. server: Detect when WAL includes unapplied cluster version set to hig… 

    …her version

This is because etcd v3.5 will panic when it encounters
ClusterVersionSet entry with version >3.5.0. For downgrades to v3.5 to
work we need to make sure this entry is snapshotted.
    @serathius
    serathius committed Oct 29, 2021
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  3. server: Use server version to decide if to downgrade has finished

    @serathius
    serathius committed Oct 29, 2021
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  4. server: Implement storage downgrades 

    By validating if WAL doesn't include any incompatible entries we can
implement storage downgrades.
    @serathius
    serathius committed Oct 29, 2021
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  5. tests: Add e2e tests for downgrades

    @serathius
    serathius committed Oct 29, 2021
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  6. server: Remove lock from adapter to avoid deadlock

    @serathius
    serathius committed Oct 29, 2021
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