RFC: support witness(log only replica) #106
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Signed-off-by: Connor1996 <zbk602423539@gmail.com>
ethercflow
reviewed
Feb 9, 2023
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| ## Background | ||
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| On cloud env, TiKV is equipped with AWS EBS storage for single node which provides durability of 99.9%. Moreover, TiKV organizes 3 Raft replicas on top of that, which may be a overkill for durability. To reduce cost, we can introduce a mechanism named "2 Replicas With 1 Log Only" instead of 3 replicas to save 30% storage resources and cut down about 100%(1 core) CPU usage empirically on the cloud. Compared with the original 3 replicas architecture, the "1 Log Only" replica stores raft logs but does not apply it, which still ensures data consistency through the Raft protocol. |
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Our usage doc mentioned: Amazon Elastic Block Store (EBS) with 99.8%~99.9% and durability or Persistent Disk of Google Cloud Platform (GCP) with 99.99%~99.999% durability as the storage of each TiKV node. Should we keep with it?
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