Fix a deadlock condition #331
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In OpenSegment(), we are holding a lock to do a bunch of operations, which includes bumping an epoch. Bumping an epoch could trigger drain callbacks, which includes the flush callback. The flush callback may in turn call OpenSegment() again, which would take the lock again, resulting in a self-deadlock. The solution is to release the lock before bumping epoch: the lock is only to protect the file list, which is already releasable at this point.
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In OpenSegment(), we are holding a lock to do a bunch of operations, which includes bumping an epoch. Bumping an epoch could trigger drain callbacks, which includes the flush callback. The flush callback may in turn call OpenSegment() again, which would take the lock again, resulting in a self-deadlock.
The solution is to release the lock before bumping epoch: the lock is only to protect the file list, which is already releasable at this point.