Method truncate

src/state/log.cpp:382–390

TODO(benh): Truncation could be optimized by saving the "oldest" snapshot and only doing a truncation if/when we update that snapshot. TODO(benh): Truncation is not enough to keep the log size small as the log could get very fragmented. We'll need a way to defragment the log as some state entries might not get set over a long period of time and their associated snapshots are causing the log to gro

// of time and their associated snapshots are causing the log to grow
// very big.
void LogStorageProcess::truncate()
{
  // We lock the truncation since it includes a call to
  // Log::Writer::truncate which must be serialized with calls to
  // Log::Writer::append.
  mutex.lock()
    .then(defer(self(), &Self::_truncate))
    .onAny(lambda::bind(&Mutex::unlock, mutex));
}


Future<Nothing> LogStorageProcess::_truncate()