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Make Cassandra replication factor configurable (issue #787) (#887)

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Add CASSANDRA_REPLICATION_FACTOR environment variable and
--cassandra-replication-factor CLI argument to cassandra_config.py.

Update all four table store constructors (ConfigTableStore,
KnowledgeTableStore, LibraryTableStore, IamTableStore) to accept
an optional replication_factor parameter and use it in keyspace
creation CQL queries.

Thread the replication factor through all service constructors:
Configuration, KnowledgeManager, Librarian, IamService, and
knowledge store Processor.
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10 changed files with 46 additions and 20 deletions
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5
trustgraph-flow/trustgraph/config/service/config.py
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@ -11,13 +11,14 @@ logger = logging.getLogger(__name__)
class Configuration:
def __init__(self, push, host, username, password, keyspace):
def __init__(self, push, host, username, password, keyspace,
replication_factor=1):
# External function to respond to update
self.push = push
self.table_store = ConfigTableStore(
host, username, password, keyspace
host, username, password, keyspace, replication_factor
)
async def inc_version(self):