Tomasz Grabiec 074be4d4e8 memtable, cache: Run mutation_cleaner worker in its own scheduling group ...

The worker is responsible for merging MVCC snapshots, which is similar
to merging sstables, but in memory. The new scheduling group will be
therefore called "memory compaction".

We should run it in a separate scheduling group instead of
main/memtables, so that it doesn't disrupt writes and other system
activities. It's also nice for monitoring how much CPU time we spend
on this.

2018-06-27 21:51:04 +02:00

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