WIP: Send samples to joining ingester during handover#788

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leth wants to merge 7 commits intomasterfrom

Commits on Apr 11, 2018

When transferring state, mark the next ingester on each token
Marcus Cobden
committed
During ingester handover, batch up samples in new ingester
Marcus Cobden
committed
Add a test to check queued samples are added to the store
Marcus Cobden
committed
Add PREPARING_TO_LEAVE state to ingester handover
Marcus Cobden
committed
Clear NextIngester after transfer completes
Marcus Cobden
committed

Commits on Apr 12, 2018

Improve error cases and add docstrings
Marcus Cobden
committed
Joining ingesters should now be healthy for writes
Marcus Cobden
committed