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Single node down when joining and leaving will cause total outage #1290

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@bboreham

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@bboreham

If you have 3 ingesters, and replication factor 3, then a rolling update will give this error:

at least 3 live ingesters required, could only find 2

This is because the distributor increases the size of the quorum required when it finds ingesters joining and leaving.

Strikes me there is something wrong here.

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