lucaong / cubdb / 180

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travis-ci

Fix race condition during compaction

The compaction process actually happens in two phases: actual
compaction, and catch-up.

The previous implementation was starting the catch-up phase
asynchronously, introducing a race condition: right after actual
compaction completed, and before catch-up started, there was the
possibility to erroneously start another concurrent compaction, because
the check if there is a compaction process already running would return
`false`. This race condition was more likely to occur when running a
compaction uring heavy write load.

This commit removes the race condition.

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