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From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: NetworkTopologyStrategy with 1 node
Date Sat, 26 May 2012 00:00:19 GMT
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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