arcadedb
https://github.com/arcadedata/arcadedb
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- Issues
- HA: no cluster-level test that a follower forwards a redis newline batch containing a write to the leader
- HA: long-running seeded chaos test for compound failure and recovery scenarios
- HA: ArcadeDBServer.registerDatabase registers a database without the HA wrapper
- Postgres wire: a prepared statement describes computed columns (count(*), sum(), max(), expressions) as varchar, so pgjdbc and Arrow ADBC return them as strings
- Queries that embed their values are re-parsed on every call (Cypher ~10x, SQL ~5x) and push parameterized statements out of the LRU statement cache: parameterize literals before the cache lookup?
- Question: which bulk graph path and WAL setting would you consider representative for a benchmark? (served: /batch is 6.5x the sqlscript path; GraphBatch defaults to the WAL off)
- SQL: a `$1` parameter is never served from an index, so every parameterized lookup over the Postgres wire scans the whole type
- HA: follower stuck at the snapshot index after a snapshot install (stale term), cluster silently loses fault tolerance for ~60 s
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