yugabyte-db
https://github.com/yugabyte/yugabyte-db
C++
YugaByteDB is a high-performance, transactional database for building distributed cloud services. It currently supports Redis API (as a true DB), Cassandra API and SQL is coming very soon.
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- Issues
- [YSQL] [Parallel Query] Parallel query feature doesn't scale well with number of workers.
- [YSQL] [Parallel Query] With parallel workers enabled, few queries of JoinG3 microbenchmarks output/project more rows than the query actually should. It is a correctness issue.
- [YSQL] [Parallel Query] Few Orderby microbenchmarks regressed by 35-58% with the feature enabled
- [YSQL] [Parallel Query] Few index scan microbenchmarks regressed by 5X - 8X with the feature enabled
- [YSQL] Make ANALYZE more efficient
- Reduce threshold for clock skew alert from 500 ms to 250 ms
- [DocDB] Early Abort RC transactions whenever required
- [YSQL] YB base scans cost model may produce suboptimal plans for queries with LIMIT clause
- [YSQL] Use local index filters for Bitmap Scans
- [YSQL] Flaky test in TSAN: org.yb.pgsql.TestPgRegressCursor.testPgRegressCursor
- Docs
- C++ not yet supported