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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/cores/knowledge.py
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@ -17,11 +17,12 @@ class KnowledgeManager:
def __init__(
self, cassandra_host, cassandra_username, cassandra_password,
keyspace, flow_config,
keyspace, flow_config, replication_factor=1,
):
self.table_store = KnowledgeTableStore(
cassandra_host, cassandra_username, cassandra_password, keyspace
cassandra_host, cassandra_username, cassandra_password, keyspace,
replication_factor
)
self.loader_queue = asyncio.Queue(maxsize=20)