K4 v1.6.3

K4 v1.6.3 BREAKING PATCH

• Adding locks for newSStables, and sstableIndexesToRemove, to prevent any kind of race conditions whilst multi-routine compaction is occuring.

K4 v1.6.2

K4 v1.6.2 BREAKING PATCH

• we should keep track of merged sstables and what sstables are being added and do the shifting around of whats been removed and what has to be added after multi-routine compaction this will prevent index panics as in prior version.

K4 v1.6.1

K4 v1.6.1 BREAKING PATCH

• K4 flushMemtable method patch. We should not be adding keys to a bloom filter if the value of the key is a tombstone.

K4 v1.6.0

K4 v1.6.0 BREAKING MINOR

• Multithreaded paired parallel compaction

K4 v1.5.2

K4 v1.5.2 BREAKING PATCH

Patch

• backgroundWalWriter reformatting and escalation of wal queue items on engine closure
• Put and Delete operation checks for if keys and or provided values are nil
• NGet, GreaterThan, LessThan, GreaterThanEq, LessThanEq, Range, NRange corrections to check for nil keys

K4 v1.5.1

K4 v1.5.1 BREAKING PATCH

• K4(Get()) method correction. Had invalid logic in regards to checking if value was a tombstone.
• Added more log messages so you can follow along with what the system is doing whilst running it.

K4 v1.5.0b

K4 v1.5.0b BREAKING MINOR

• Skiplist corrections regarding setting expired nodes with tombstone value.
• Skiplist Copy() function corrections, skip tombstoned keys.
• Background compaction and flushing operations with graceful shutdowns
• Bloomfilter test additions

K4 v1.4.2

K4 v1.4.2 BREAKING PATCH

• Minor patch on clearing memtable on flush operations.

K4 v1.4.1

K4 v1.4.1 BREAKING PATCH

• Minor patch on Get() method. Must not return tombstoned/deleted keys, tiny correction.

K4 v1.4.0

K4 v1.4.0 BREAKING MINOR

• Optional compression implementation. The algorithm is inspired by good 'ol LZ77. It is designed to be simple and fairly optimized.
  -- COMPRESSION_WINDOW_SIZE constant
  -- Updated SSTable, and WAL logic to compress and decompress where need be, specifically before serialization and after deserialization.