Partition Loss Policy mismatch blocks server restart

[Conrad Mukai (cmukai)]

I set up a cluster of server nodes with the following cacheConfiguration:

        <property name="cacheConfiguration">
            <list>
                <!-- Partitioned cache example configuration (Atomic mode). -->
                <bean 
class="org.apache.ignite.configuration.CacheConfiguration">
                    <property name="name" value="default"/>
                    <property name="atomicityMode" value="ATOMIC"/>
                    <property name="backups" value="0"/>
                </bean>
            </list>
        </property>

Apparently an application uploaded a client configuration with a cache group 
and now I cannot restart the cluster with the original configuration. I get the 
following error:

Caused by: class org.apache.ignite.IgniteCheckedException: Partition Loss 
Policy mismatch for caches related to the same group 
[groupName=group_data_loom, existingCache=AlphaCaseTelProtobufCache1, 
existingPartitionLossPolicy=READ_WRITE_SAFE, 
startingCache=AlphaCaseTelProtobufCache, startingPartitionLossPolicy=IGNORE]

First question is how can I restart my cluster. The second question is this 
really due to the client configuration, and if so why is it possible for a 
client to break the entire service restart?

Thanks in advance,
Conrad