better on file systems where POSIX locks are slow or broken (e.g. NFS on
some systems).
- - Locks are no longer taken when updating manifest files. (A race between
- two writing processes will only result in one lost entry, which is not a
- big deal, and it's also very unlikely.)
+ - Manifest files are now updated without the need of taking locks.
- Updates of statistics counters are now always done in one of the
sub-level statistics files. This reduces lock contention, which