incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Benjamin Black...@b3k.us>
Subject Re: Quorom consistency in a changing ring
Date Tue, 27 Apr 2010 00:30:48 GMT
Live nodes that have tokens indicating they should receive a copy of
data count towards write quorum.  This means if a node is down (not
decommissioned) the copy sent to the node acting as the hinted handoff
replica will not count towards achieving quorum.  If a token is moved,
it is moved.  It is not in 2 places at once.  If you are using
CL.QUORUM and it succeeds, it really is reading or writing RF / 2 + 1
copies.


b

2010/4/26 Peter Schüller <scode@spotify.com>:
>> Increasing the replication level is known to break it.
>
> Thanks! Yes, of that I am aware. When I said ring changes I meant
> nodes being added and removed, or just re-balanced, implying tokens
> moving around the ring.
>
> --
> / Peter Schuller aka scode
>

Mime
View raw message