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Posted to user@cassandra.apache.org by Erik Forsberg <fo...@opera.com> on 2015/10/06 11:43:38 UTC
How are writes handled while adding nodes to cluster?
Hi!
How are writes handled while I'm adding a node to a cluster, i.e. while
the new node is in JOINING state?
Are they queued up as hinted handoffs, or are they being written to the
joining node?
In the former case I guess I have to make sure my max_hint_window_in_ms
is long enough for the node to become NORMAL or hints will get dropped
and I must do repair. Am I right?
Thanks,
\EF
Re: How are writes handled while adding nodes to cluster?
Posted by Robert Coli <rc...@eventbrite.com>.
On Tue, Oct 6, 2015 at 11:10 AM, Tyler Hobbs <ty...@datastax.com> wrote:
> When a node is joining, writes are sent to both the current replicas *and*
> the joining replica. However, the joining replica does not count towards
> the consistency level. So, for example, if you write at
> ConsistencyLevel.TWO, and only one existing replica and the joining replica
> respond, the write will be considered a failure.
>
The word I usually use to summarize the nature of the writes being sent to
the joining replica is :
"Extra"
In that they are otherwise just like replication, but no one but the
joining node cares if they are delivered...
=Rob
Re: How are writes handled while adding nodes to cluster?
Posted by Tyler Hobbs <ty...@datastax.com>.
When a node is joining, writes are sent to both the current replicas *and*
the joining replica. However, the joining replica does not count towards
the consistency level. So, for example, if you write at
ConsistencyLevel.TWO, and only one existing replica and the joining replica
respond, the write will be considered a failure.
On Tue, Oct 6, 2015 at 4:43 AM, Erik Forsberg <fo...@opera.com> wrote:
> Hi!
>
> How are writes handled while I'm adding a node to a cluster, i.e. while
> the new node is in JOINING state?
>
> Are they queued up as hinted handoffs, or are they being written to the
> joining node?
>
> In the former case I guess I have to make sure my max_hint_window_in_ms
> is long enough for the node to become NORMAL or hints will get dropped
> and I must do repair. Am I right?
>
> Thanks,
> \EF
>
--
Tyler Hobbs
DataStax <http://datastax.com/>