Raphael S. Carvalho 9823164c89 db: introduce compaction manager ...

Currently, each column family creates a fiber to handle compaction requests
in parallel to the system. If there are N column families, N compactions
could be running in parallel, which is definitely horrible.

To solve that problem, a per-database compaction manager is introduced here.

Compaction manager is a feature used to service compaction requests from N
column families. Parallelism is made available by creating more than one
fiber to service the requests. That being said, N compaction requests will
be served by M fibers.

A compaction request being submitted will go to a job queue shared between
all fibers, and the fiber with the lowest amount of pending jobs will be
signalled.

Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>

2015-08-11 17:25:46 +03:00

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