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From Tyler Hobbs <ty...@datastax.com>
Subject Re: Not enough replicas???
Date Mon, 04 Feb 2013 16:17:28 GMT
RackInferringSnitch determines each node's DC and rack by looking at the
second and third octets in its IP address (
http://www.datastax.com/docs/1.0/cluster_architecture/replication#rackinferringsnitch),
so your nodes are in DC "28".

Your replication strategy says to put one replica in DC "datacenter1", but
doesn't mention DC "28" at all, so you don't have any replicas for your
keyspace.


On Mon, Feb 4, 2013 at 7:55 AM, <Stephen.M.Thompson@wellsfargo.com> wrote:

> Hi Edward - thanks for responding.   The keyspace could not have been
> created more simply:****
>
> ** **
>
> create keyspace KEYSPACE_NAME;****
>
> ** **
>
> According to the help, this should have created a replication factor of 1:
> ****
>
> ** **
>
> Keyspace Attributes (all are optional):****
>
> - placement_strategy: Class used to determine how replicas****
>
>   are distributed among nodes. Defaults to NetworkTopologyStrategy with***
> *
>
>   one datacenter defined with a replication factor of 1
> ("[datacenter1:1]").****
>
> ** **
>
> Steve****
>
> ** **
>
> -----Original Message-----
> From: Edward Capriolo [mailto:edlinuxguru@gmail.com]
> Sent: Friday, February 01, 2013 5:49 PM
> To: user@cassandra.apache.org
> Subject: Re: Not enough replicas???
>
> ** **
>
> Please include the information on how your keyspace was created. This may
> indicate you set the replication factor to 3, when you only have 1 node, or
> some similar condition.****
>
> ** **
>
> On Fri, Feb 1, 2013 at 4:57 PM,  <Stephen.M.Thompson@wellsfargo.com>
> wrote:****
>
> > I need to offer my profound thanks to this community which has been so *
> ***
>
> > helpful in trying to figure this system out.****
>
> >** **
>
> >** **
>
> >** **
>
> > I’ve setup a simple ring with two nodes and I’m trying to insert data **
> **
>
> > to them.  I get failures 100% with this error:****
>
> >** **
>
> >** **
>
> >** **
>
> > me.prettyprint.hector.api.exceptions.HUnavailableException: : May not **
> **
>
> > be enough replicas present to handle consistency level.****
>
> >** **
>
> >** **
>
> >** **
>
> > I’m not doing anything fancy – this is just from setting up the ****
>
> > cluster following the basic instructions from datastax for a simple ****
>
> > one data center cluster.  My config is basically the default except ****
>
> > for the changes they discuss (except that I have configured for my IP **
> **
>
> > addresses… my two boxes are****
>
> > .126 and .127)****
>
> >** **
>
> >** **
>
> >** **
>
> > cluster_name: 'MyDemoCluster'****
>
> >** **
>
> > num_tokens: 256****
>
> >** **
>
> > seed_provider:****
>
> >** **
>
> >   - class_name: org.apache.cassandra.locator.SimpleSeedProvider****
>
> >** **
>
> >     parameters:****
>
> >** **
>
> >          - seeds: "10.28.205.126"****
>
> >** **
>
> > listen_address: 10.28.205.126****
>
> >** **
>
> > rpc_address: 0.0.0.0****
>
> >** **
>
> > endpoint_snitch: RackInferringSnitch****
>
> >** **
>
> >** **
>
> >** **
>
> > Nodetool shows both nodes active in the ring, status = up, state =
> normal.****
>
> >** **
>
> >** **
>
> >** **
>
> > For the CF:****
>
> >** **
>
> >** **
>
> >** **
>
> >    ColumnFamily: SystemEvent****
>
> >** **
>
> >      Key Validation Class: org.apache.cassandra.db.marshal.UTF8Type****
>
> >** **
>
> >      Default column value validator:****
>
> > org.apache.cassandra.db.marshal.UTF8Type****
>
> >** **
>
> >      Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type****
>
> >** **
>
> >      GC grace seconds: 864000****
>
> >** **
>
> >      Compaction min/max thresholds: 4/32****
>
> >** **
>
> >      Read repair chance: 0.1****
>
> >** **
>
> >      DC Local Read repair chance: 0.0****
>
> >** **
>
> >      Replicate on write: true****
>
> >** **
>
> >      Caching: KEYS_ONLY****
>
> >** **
>
> >      Bloom Filter FP chance: default****
>
> >** **
>
> >      Built indexes: [SystemEvent.IdxName]****
>
> >** **
>
> >      Column Metadata:****
>
> >** **
>
> >        Column Name: eventTimeStamp****
>
> >** **
>
> >          Validation Class: org.apache.cassandra.db.marshal.DateType****
>
> >** **
>
> >        Column Name: name****
>
> >** **
>
> >          Validation Class: org.apache.cassandra.db.marshal.UTF8Type****
>
> >** **
>
> >          Index Name: IdxName****
>
> >** **
>
> >          Index Type: KEYS****
>
> >** **
>
> >      Compaction Strategy:****
>
> > org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy****
>
> >** **
>
> >      Compression Options:****
>
> >** **
>
> >        sstable_compression:****
>
> > org.apache.cassandra.io.compress.SnappyCompressor****
>
> >** **
>
> >** **
>
> >** **
>
> > Any ideas?****
>



-- 
Tyler Hobbs
DataStax <http://datastax.com/>

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