Ring describe will fail for any cluster > 64,000 vnodes (250 nodes with 256 vnodes) because the ring description no longer fits in a single Thrift frame.
You can increase the maximum frame size in Cassandra, but with Astyanax being hard coded at 16MiB, the only way to meaningfully operate Astyanax against such a cluster is to include all nodes in the seeds list, or write a custom node provider.
Ring describe will fail for any cluster > 64,000 vnodes (250 nodes with 256 vnodes) because the ring description no longer fits in a single Thrift frame.
You can increase the maximum frame size in Cassandra, but with Astyanax being hard coded at 16MiB, the only way to meaningfully operate Astyanax against such a cluster is to include all nodes in the seeds list, or write a custom node provider.
There is an open pull request which would address this issue: https://github.com/Netflix/astyanax/pull/547