b8eb4ed9cd
So that they are not left on disk even though we did a clean shutdown.
First part of the fix is to ensure that closed segments are recognized
as not allocating (_closed flag). Not doing this prevents them from
being collected by discard_unused_segments(). Second part is to
actually call discard_unused_segments() on shutdown after all segments
were shut down, so that those whose position are cleared can be
removed.
Fixes #2550.
Message-Id: <1499358825-17855-1-git-send-email-tgrabiec@scylladb.com>
(cherry picked from commit 6555a2f50b)