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https://issues.apache.org/jira/browse/CASSANDRA-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592330#comment-13592330
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jal commented on CASSANDRA-5310:
--------------------------------
If I use NTS and set a replication of 6 for example (3 replicas in DC1, 3
replicas in DC2), I still have the problem, because the authentication module
works in QUORUM consistency, and needs to read the user on 4 nodes (probably 3
nodes in the local DC, and at least 1 node in the second datacenter). If there
is a network outage, you will never be able to read the user in the remote
center, and you will not get the QUORUM.
This happen everytime I want to open a new connection.
This also probably happen after 2000 millisec. (default duration of the
permissions_validity_in_ms) if your connection is already open.
> New authentication module does not wok in multi datacenters in case of
> network outage
> -------------------------------------------------------------------------------------
>
> Key: CASSANDRA-5310
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5310
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.2
> Environment: Ubuntu 12.04
> Cluster of 16 nodes in 2 datacenters (8 nodes in each datacenter)
> Reporter: jal
>
> With 1.2.2, I am using the new authentication backend PasswordAuthenticator
> with the authorizer CassandraAuthorizer
> In case of network outage, we are no more able to connect to Cassandra.
> Here is the error message we get when I want to connect through cqlsh:
> Traceback (most recent call last):
> File "./cqlsh", line 2262, in <module>
> main(*read_options(sys.argv[1:], os.environ))
> File "./cqlsh", line 2248, in main
> display_float_precision=options.float_precision)
> File "./cqlsh", line 483, in __init__
> cql_version=cqlver, transport=transport)
> File "./../lib/cql-internal-only-1.4.0.zip/cql-1.4.0/cql/connection.py", line
> 143, in connect
> File "./../lib/cql-internal-only-1.4.0.zip/cql-1.4.0/cql/connection.py",
> line 59, in __init__
> File "./../lib/cql-internal-only-1.4.0.zip/cql-1.4.0/cql/thrifteries.py",
> line 157, in establish_connection
> File
> "./../lib/cql-internal-only-1.4.0.zip/cql-1.4.0/cql/cassandra/Cassandra.py",
> line 455, in login
> File
> "./../lib/cql-internal-only-1.4.0.zip/cql-1.4.0/cql/cassandra/Cassandra.py",
> line 476, in recv_login
> cql.cassandra.ttypes.AuthenticationException:
> AuthenticationException(why='org.apache.cassandra.exceptions.UnavailableException:
> Cannot achieve consistency level QUORUM')
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