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From Cyril Auburtin <cyril.aubur...@gmail.com>
Subject Re: NetworkTopologyStrategy with 1 node
Date Sat, 26 May 2012 09:20:14 GMT
thx, but still not

I did:

update keyspace ks with strategy_options = [{DC1:1}] and placement_strategy
= 'org.apache.cassandra.locator.NetworkTopologyStrategy';

then in cassandra-cli :

[default@ks] list Position;
Using default limit of 100
Internal error processing get_range_slices

and in cassandra console:

 INFO 11:10:52,680 Keyspace updated. Please perform any manual operations.
ERROR 11:13:37,565 Internal error processing get_range_slices
java.lang.IllegalStateException: datacenter (DC1) has no more endpoints,
(1) replicas still needed
at
org.apache.cassandra.locator.NetworkTopologyStrategy.calculateNaturalEndpoints(NetworkTopologyStrategy.java:118)
 at
org.apache.cassandra.locator.AbstractReplicationStrategy.getNaturalEndpoints(AbstractReplicationStrategy.java:101)
 at
org.apache.cassandra.service.StorageService.getLiveNaturalEndpoints(StorageService.java:1538)

How do I have to set the cassndra-topology.properties for a single node in
ths DC?
I will try to do the same thing with C1.1, it could work

2012/5/26 Edward Capriolo <edlinuxguru@gmail.com>

> replication_factor = 1 and strategy_options = [{DC1:0}]
>
> You should not be setting both of these.
>
> All you should need is:
> strategy_options = [{DC1:1}]
>
> On Fri, May 25, 2012 at 1:47 PM, Cyril Auburtin
> <cyril.auburtin@gmail.com> wrote:
> > I was using a single node, on cassandra 0.7.10
> >
> > with Network strategy = SimpleStrategy, and replication factor = 1,
> > everything is fine, I was using a consistency level of ONE, for
> > reading/writing
> >
> > I have updated the keyspace to
> >
> > update keyspace Mymed with replication_factor = 1 and strategy_options =
> > [{DC1:0}] and placement_strategy =
> > 'org.apache.cassandra.locator.NetworkTopologyStrategy';
> >
> > with conf/cassandra-topology.properties having just this for the moment:
> >
> > default=DC1:r1
> >
> > the keyspace could update, I could use ks; also, but can't read anything
> >
> > even from Thrift using ConsistencyLevel.ONE; it will complain that this
> > strategy require Quorum
> >
> > I tried with  ConsistencyLevel.LOCAL_QUORUM;  but get an exception like :
> >
> > org.apache.thrift.TApplicationException: Internal error processing
> get_slice
> >
> > and in cassandra console:
> >
> > DEBUG 19:45:02,013 Command/ConsistencyLevel is
> > SliceFromReadCommand(table='Mymed',
> > key='637972696c2e617562757274696e40676d61696c2e636f6d',
> > column_parent='QueryPath(columnFamilyName='Authentication',
> > superColumnName='null', columnName='null')', start='', finish='',
> > reversed=false, count=100)/LOCAL_QUORUM
> > ERROR 19:45:02,014 Internal error processing get_slice
> > java.lang.NullPointerException
> > at
> >
> org.apache.cassandra.locator.NetworkTopologyStrategy.getReplicationFactor(NetworkTopologyStrategy.java:139)
> > at
> >
> org.apache.cassandra.service.DatacenterReadCallback.determineBlockFor(DatacenterReadCallback.java:83)
> > at org.apache.cassandra.service.ReadCallback.<init>(ReadCallback.java:77)
> > at
> >
> org.apache.cassandra.service.DatacenterReadCallback.<init>(DatacenterReadCallback.java:48)
> > at
> >
> org.apache.cassandra.service.StorageProxy.getReadCallback(StorageProxy.java:461)
> > at
> >
> org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:326)
> > at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:291)
> >
> > So probably I guess Network topology strategy can't work with just one
> node?
> >
> > thx for any feedback
>

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