Glauber Costa 70c47eb045 controller: adjust constants for compaction controller ...

Right now the controller adjusts its shares based on how big the backlog
is in comparison to shard memory. We have seen in some tests that if the
dataset becomes too big, this may cause compactions to dominate.

While we may change the input altogether in future versions, I'd like to
propose a quick change for the time being: move the high point from 10x
memory size to 30x memory size. This will cause compactions to increase
in shares more slowly.

While this is as magic as the 10 before, they will allow us to err in
the side of caution, with compactions not becoming aggressive enough to
overly disrupt workloads.

Signed-off-by: Glauber Costa <glauber@scylladb.com>

2018-06-18 15:16:38 -04:00

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