I have cluster cassandra-2.2.19-1. In logs on each node i see errors, like this:
Not enough space for compaction, estimated sstables = 1, expected write size = 113084823335
Not enough space for compaction, 540755.8MB estimated. Reducing scope.
Not enough space for compaction, 389382.06MB estimated. Reducing scope.
Not enough space for compaction, 248544.98MB estimated. Reducing scope.
Why are there 3 different sizes? How to understand in the end how much space I need to add to the disk so that the compaction process is completed successfully, and how to understand how much disk space consumption will increase after this operation.
If these errors occur on 3 nodes, then 3 nodes need to add space?
Will adding 4 nodes in the cluster help, but with the same size as the rest?