should commit index be persistent?

[Skype Xu]

Hi,

Follower crashed and restarted, if commit index is not persisent, should the follower replay

all log entries once leader send a commit message ? if there is a large number of log entries,

it will take some time to complete, possible very long.

Regards,

[Oren Eini (Ayende Rahien)]

Raft can run in persistent or in memory mode.

Using in memory mode, all data is in memory, obviously. A crashing node will behave pretty much like a brand new node, and it will first need to get a snapshot, then get the commits since that snapshot, etc.

For the most part, though, it is used with persistence. Note that this doesn't solve the problem. If your node was down for a long time, it will still have a lot to catch up on.

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Oren Eini l CEO l Mobile: + 972-52-548-6969

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