I had 3 nodes, all with ~550GB, and added 4 more. I hoped that data would migrate on its own from old servers to new ones. Unfortunately after one day, data seems to stay in old places.
In parallel, there is a constant stream of incoming data, and about 150GB more per node was added. So old nodes have currently 550+150 = ~700GB, new ones ~150GB.
Should I just wait? Is there a command or option that I should run to make them rebalance? Or it is a problem with replication 1 or inserting data while rebalancing?
-- Address Load Tokens Owns Host ID Rack UN x.x.x.x 702.48 GB 256 13.1% 3e9e7e79-c727-4a3f-86ad-0dbfb77a4540 rack1 UN x.x.x.x 692.47 GB 256 15.5% ac41b3df-301e-470a-b531-12f2aeba7328 rack1 UN x.x.x.x 660.65 GB 256 14.2% 8b1bb70d-57fe-460a-b756-4ac82b24acb6 rack1 UN x.x.x.x 156.7 GB 256 15.1% d499acd3-8eae-4a4c-bba3-cd8e45bd1ce3 rack1 UN x.x.x.x 140.99 GB 256 13.6% f266de96-8547-4e68-8d31-50a13e6c6628 rack1 UN x.x.x.x 138.44 GB 256 13.5% cbf53e0d-398d-4fc7-befd-b83d173a4e67 rack1 UN x.x.x.x 155.17 GB 256 15.0% dddbcb68-9730-456a-8429-de06bcf2f2bb rack1
I'm using Cassandra 2.09. Murmur 3 partitioner, 256 vnodes per node, replication 1 (no copy).