> On Dec 28, 2018, at 2:17 AM, Jinhua Luo <luajit...@gmail.com> wrote:
>
> Hi All,
>
> While the pending node get streaming of token ranges from other nodes,
> all coordinator would send new writes to it so that it would not miss
> any new data, correct?
>
> I have two (maybe silly) questions here:
> Given the CL is ONE,
> a) what if the coordinator haven't meet the pending node via gossip,
> and only sends mutation to the main replica (the replica would be
> replaced by the pending node)?
There’s a delay between joining in gossip and calculating the bootstrap
streaming plan to mitigate this
There’s also protections added in recent versions to avoid ack’ing a write (or
read or stream) for ranges that don’t properly own the range, so
topology/gossip disagreements shouldn’t result in consistency violations.
> b) what if the coordinator fails to send the mutation to pending node?
The coordinators increase consistency level/ blockFor by one for each pending
node, so the pending node may not get the write if your RF is > 1, but enough
nodes will that you’ll meet your consistency guarantee
>
> In both cases, when the pending node finish streaming and join the
> ring eventually, the mutation mentioned above would be lost?
>
> Regards,
> Jinhua Luo
>
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