VT
Which is actually not so difficult but hard to explain
Size: a a a
2016 November 18
RK
Which is actually not so difficult but hard to explain
you mean how many nodes apply the same block?
VT
I mean what the guarantees when you insert data
VT
For example you have replica set of 3
VT
Your data is replicated to 3 nodes
VT
And you insert data to one node
VT
Should it be 'at least 2' or 'one' is enough?
RK
For example you have replica set of 3
single OK after insert is not enough? ah yes
VT
OK is enough, question is what this OK means =)
RK
Should it be 'at least 2' or 'one' is enough?
i guess it should be derived from replica factor
VT
Nope, that's different
VT
replica factor is how many times your data is copied
E
we had a conversation like this here
E
we're about to break hell loose
RK
replica factor is how many times your data is copied
i know. and replica factor is a basic factor of durability
VT
Generally there are 2 options: async replication and sync replication
VT
async is default in clickhouse, and it says 'insert in one is OK'
RK
so if snapshot is saved by 'replica factor' nodes this insert is really ok
VT
sync replication usually is really slow
VT
It's not. It's OK in terms of guarantees but slowdown is like 10 times easily