Sonic v1.2.0

• Fixed a rare deadlock occuring when 3 concurrent operations get executed on different threads for the same collection, in the following timely order: PUSH then FLUSHB then PUSH [@valeriansaliou, d96546b].
• Reworked the KV store manager to perform periodic memory flushes to disk, thus reducing startup time [@valeriansaliou, 6713488].
• Stop accepting Sonic Channel commands when shutting down Sonic [@valeriansaliou, #131].
• Introduced a server statistics INFO command to Sonic Channel [@valeriansaliou, #70].
• Added the ability to disable the lexer for a command with the command modifier LANG(none) [@valeriansaliou, #108].
• Added a backup and restore system for both KV and FST stores, which can be triggered over Sonic Channel with TRIGGER backup and TRIGGER restore [@valeriansaliou, #5].
• Added the ability to disable KV store WAL (Write-Ahead Log) with the write_ahead_log option, which helps limit write wear on heavily loaded SSD-backed servers [@valeriansaliou, #130].

Sonic v1.1.9

• RocksDB has been bumped to v5.18.3, which fixes a dead-lock occuring in RocksDB at scale when a compaction task is ran under heavy disk writes (ie. disk flushes). This dead-lock was causing Sonic to stop responding to any command issued for the frozen collection. This dead-lock was due to a bug in RocksDB internals (not originating from Sonic itself) [@baptistejamin, 19c4a10].
• Reworked the FLUSHB command internals, which now use the atomic delete_range() operation provided by RocksDB v5.18 [@valeriansaliou, 660f8b7].
• Added the LANG(<locale>) command modifier for QUERY and PUSH, that lets a Sonic Channel client force a text locale (instead of letting the lexer system guess the text language) [@valeriansaliou, #75].
• The FST word lookup system, used by the SUGGEST command, now support all scripts via a restricted Unicode range forward scan [@valeriansaliou, #64].

Sonic v1.1.8

• A store acquire lock has been added to prevent 2 concurrent threads from opening the same collection at the same time [@valeriansaliou, 2628077].

Sonic v1.1.7

• A superfluous mutex was removed from KV and FST store managers, in an attempt to solve a rare dead-lock occurring on high-traffic Sonic setups in the KV store [@valeriansaliou, 60566d2].

Sonic v1.1.6

• Reverted changes made in v1.1.5 regarding the open files rlimit, as this can be set from outside Sonic [@valeriansaliou, f6400c6].
• Added Chinese Traditional stopwords [@dsewnr, #87].
• Improved the way database locking is handled when calling a pool janitor; this prevents potential dead-locks under high load [@valeriansaliou, fa78372].

Sonic v1.1.5

• Added the server.limit_open_files configuration variable to allow configuring rlimit [@valeriansaliou].

Sonic v1.1.4

• Automatically adjust rlimit for the process to the hard limit allowed by the system (allows opening more FSTs in parallel) [@valeriansaliou].
• Added Kannada stopwords [@dileepbapat].
• The Docker image is now much lighter [@codeflows].

Sonic v1.1.3

• Rework Sonic Channel buffer management using a VecDeque (Sonic should now work better in harsh network environments) [@valeriansaliou, 1c2b9c8].
• Limit the size of words that can hit against the FST graph, as the FST gets slower for long words [@valeriansaliou, #81].

Sonic v1.1.2

• FST graph consolidation locking strategy has been improved even further, based on issues with the previous rework we have noticed at scale in production (now, consolidation locking is done at a lower-priority relative to actual queries and pushes to the index) [@valeriansaliou, #68].

Sonic v1.1.1

• FST graph consolidation locking strategy has been reworked as to allow queries to be executed lock-free when the FST consolidate task takes a lot of time (previously, queries were being deferred due to an ongoing FST consolidate task) [@valeriansaliou, #68].
• Removed special license clause introduced in v1.0.2, Sonic is full MPL 2.0 now. [@valeriansaliou]