ep-engine needs 1.5 minutes to create 1k vbuckets. Seems too slow (faster with barrier=0)
Couchstore's mergesort module, currently used for db compaction, can buffer too much data in memory
Tombstone purger need to find a better home for lifetime of deletion
engine_destroy race with VBucketMemoryDeletionTask
Stats to show how much data is written to disk.
[windows] assertion failure in test_file_sort