I'm sure that's what he meant, I just disagree that it sounds useful
--
Jeff Jirsa
> On Oct 8, 2016, at 10:33 AM, Vladimir Yudovin <vla...@winguzone.com> wrote:
>
> As far as I understand Edward meant to have option determinate actual storage
> node on client side, by driver, disregarding key hash/tokens mechanism.
>
> Best regards, Vladimir Yudovin,
> Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
> Launch your cluster in minutes.
>
>
>
>
> ---- On Sat, 08 Oct 2016 13:17:14 -0400 Jeff Jirsa <jji...@gmail.com>
> wrote ----
>
> That sounds awful, especially since you could just use SimpleStrategy with
> RF=1 and then bootstrap / decom would handle resharding for you as expected.
>
> --
> Jeff Jirsa
>
>
> > On Oct 8, 2016, at 10:09 AM, Edward Capriolo
> <edlinuxg...@gmail.com> wrote:
> >
> > I have contemplated using LocalStrategy as a "do it yourself client side
> > sharding system".
> >
> > On Sat, Oct 8, 2016 at 12:37 AM, Vladimir Yudovin
> <vla...@winguzone.com>
> > wrote:
> >
> >> Hi Prasenjit,
> >> I would like to get the replication factors of the key-spaces using
> the
> >> strategies in the same way we get the replication factors for Simple
> and
> >> NetworkTopology.
> >> Actually LocalSarategy has no replication factor:
> >>
> >> SELECT * FROM system_schema.keyspaces WHERE keyspace_name IN
> ('system',
> >> 'system_schema');
> >> keyspace_name | durable_writes | replication
> >> ---------------+----------------+---------------------------
> >> -----------------------------------------
> >> system | True | {'class':
> >> 'org.apache.cassandra.locator.LocalStrategy'}
> >> system_schema | True | {'class':
> >> 'org.apache.cassandra.locator.LocalStrategy'}
> >>
> >>
> >> It's used for internal tables and not accessible to users:
> >>
> >> CREATE KEYSPACE excel WITH replication = {'class': 'LocalStrategy'};
> >> ConfigurationException: Unable to use given strategy class:
> LocalStrategy
> >> is reserved for internal use.
> >>
> >>
> >> Best regards, Vladimir Yudovin,
> >> Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
> >> Launch your cluster in minutes.
> >>
> >>
> >>
> >>
> >> ---- On Fri, 07 Oct 2016 17:06:09 -0400 Prasenjit
> >> Sarkar&lt;prasenjit.sar...@datos.io&gt; wrote ----
> >>
> >> Thanks Vlad and Jeremiah.
> >>
> >> There were questions about support, so let me address that in more
> detail.
> >>
> >> If I look at the latest Cassandra python driver, the support for
> >> LocalStrategy is very limited (code snippet shown below) and the
> support
> >> for EverywhereStrategy is non-existent. By limited I mean that the
> >> Cassandra python driver only provides the name of the strategy for
> >> LocalStrategy and not much else.
> >>
> >> What I would like (and happy to help) is for the Cassandra python
> driver to
> >> provide support for Local and Everywhere to the same extent it is
> provided
> >> for Simple and NetworkTopology. I understand that token aware
> routing is
> >> not applicable to either strategy but I would like to get the
> replication
> >> factors of the key-spaces using the strategies in the same way we
> get the
> >> replication factors for Simple and NetworkTopology.
> >>
> >> Hope this helps,
> >> Prasenjit
> >>
> >>
> >> class LocalStrategy(ReplicationStrategy):
> >> def __init__(self, options_map):
> >> pass
> >> def make_token_replica_map(self, token_to_host_owner, ring):
> >> return {}
> >> def export_for_schema(self):
> >> """
> >> Returns a string version of these replication options which are
> >> suitable for use in a CREATE KEYSPACE statement.
> >> """
> >> return "{'class': 'LocalStrategy'}"
> >> def __eq__(self, other):
> >> return isinstance(other, LocalStrategy)
> >>
> >> On Fri, Oct 7, 2016 at 11:56 AM, Jeremiah D Jordan &lt;
> >> jeremiah.jor...@gmail.com&gt; wrote:
> >>
> >> &gt; What kind of support are you thinking of? All drivers
> should support
> >> them
> >> &gt; already, drivers shouldn’t care about replication strategy
> except when
> >> &gt; trying to do token aware routing.
> >> &gt; But since anyone can make a custom replication strategy,
> drivers that
> >> do
> >> &gt; token aware routing just need to handle falling back to not
> doing
> >> token
> >> &gt; aware routing if a replication strategy they don’t know
> about is in
> >> use.
> >> &gt; All the open sources drivers I know of do this, so they
> should all
> >> &gt; “support” those strategies already.
> >> &gt;
> >> &gt; -Jeremiah
> >> &gt;
> >> &gt; &gt; On Oct 7, 2016, at 1:02 PM, Prasenjit Sarkar &
> >> lt;prasenjit.sar...@datos.io&gt;
> >> &gt; wrote:
> >> &gt; &gt;
> >> &gt; &gt; Hi everyone,
> >> &gt; &gt;
> >> &gt; &gt; To the best of my understanding that Datastax has
> proprietary
> >> replication
> >> &gt; &gt; strategies: Local and Everywhere which are not
> part of the open
> >> source
> >> &gt; &gt; Apache Cassandra project.
> >> &gt; &gt;
> >> &gt; &gt; Do we know of any plans in the open source
> Cassandra driver
> >> community to
> >> &gt; &gt; support these two replication strategies? Would
> Datastax have a
> >> licensing
> >> &gt; &gt; concern if the open source driver community
> supported these
> >> strategies?
> >> &gt; I'm
> >> &gt; &gt; fairly new here and would like to understand the
> dynamics.
> >> &gt; &gt;
> >> &gt; &gt; Thanks,
> >> &gt; &gt; Prasenjit
> >> &gt;
> >> &gt;
> >>
> >>
> >>
> >>
> >>
> >>
>
>
>
>
>
