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http://jira.amdatu.org/jira/browse/AMDATUCASSANDRA-138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivo Ladage - van Doorn resolved AMDATUCASSANDRA-138.
----------------------------------------------------
Resolution: Fixed
Added support for concurrent schema modifications. The internal Cassandra
client in the CassandraDaemonService is replaced by a Thrift client to the
first node in the lexicographic sorted list of IP addresses of live nodes. As a
result all schema modifications on all nodes in a cluster are send to the same
node (to which we refer as the schema master).
> Support concurrent schema modifications in a Cassandra cluster
> --------------------------------------------------------------
>
> Key: AMDATUCASSANDRA-138
> URL: http://jira.amdatu.org/jira/browse/AMDATUCASSANDRA-138
> Project: Amdatu Cassandra
> Issue Type: Improvement
> Components: Cassandra daemon
> Affects Versions: 0.2.1
> Reporter: Ivo Ladage - van Doorn
> Assignee: Ivo Ladage - van Doorn
> Fix For: 0.2.2
>
>
> Currently, concurrent schema modifications in a Cassandra cluster may cause
> ConfigurationExceptions. For example, if a new tenant is deployed to all
> nodes in the cluster, all nodes will try (concurrently) to add a keyspace and
> ColumnFamily's to that new keyspace. This will cause ConfigurationExceptions,
> as Cassandra assumes that schema modifications are always executed on a
> single node in a single thread.
> To resolve this issue, all schema modifications should be handles by the
> CassandraDaemonService, which ensures the schema modifications to to executed
> by a single thread by making its methods synchronized. This still fails in a
> cluster however. To resolve this issue:
> - Schema modifications should not be executed by the local Cassandra daemon,
> but by one 'elected' node of the cluster
> - Which node will execute scheme modifications is determined by ordering all
> live nodes in the cluster (i.e. by IP address) and picking the first one
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