Sonic Files

This version introduces substantial performance improvements to PUSH requests.

Changes

Performance improvements:

• Reduce locks contention caused by IIDIncr (in f7de118)
• Use a single rocksdb::WriteBatch per Sonic request (in 606cb31, 981d1bc)
• Use merge operators for TermToIIDs and IIDToTerms (in b5921a1, 6bd24cb)
• Perform fewer merge operations by writing less often (in 3207a35)
• Avoid get_meta_to_value read in auto_increment_iid (in 79fa14f)
• And various other performance improvements

Dependency updates:

• Bump rocksdb from 0.24 to 0.25 (in 80c3827)

New Features

• Add allocator-jemalloc feature flag to enable rocksdb/jemalloc
• Add experimental NEW flag to PUSH (in f94cba0)
• impl Debug for sonic::Config (in 6464cbf)

Bug Fixes

• Fix max_flushes (in 36de4c5)