clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `DETACH TABLE ... PERMANENTLY` flag file is never fsynced: the table silently re-attaches itself after power loss
- Object storage disks ignore the entire fsync setting family: an acknowledged INSERT with `fsync_after_insert = 1` issues zero fsync and is silently lost on power loss (local metadata loss is fatal even when blobs are durable)
- Keeper can discard a fully-fsynced snapshot after power loss (no directory fsync in src/Coordination), losing acknowledged writes
- Acknowledged `DROP TABLE` / `RENAME TABLE` / `EXCHANGE TABLES` on an Atomic database can silently revert after power loss: the DDL commit record is never fsynced
- `ALTER TABLE ... DROP DETACHED PART/PARTITION` is not durable: the removal is never fsynced and no setting reaches this path, so the detached part resurrects after power loss
- Better JOIN observability in `system.query_log`
- Fix map[key] returning a later duplicate key instead of the first
- Add column allowlist/denylist settings for automatic statistics
- optimize_skip_unused_shards duplicates every group of a distributed self-join on an expression sharding key
- Use Silk fibers in QueryRunner
- Docs
- C++ not yet supported