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datomic 2025-10-21
braai engineer 2025-10-21T08:32:21.551469Z
Tried to d/transact 100,000 entities against a H2 :dev transactor DB, each with 2 sub entities (with a few datoms, not many). The Dev transactor keeled over with the following error:
H2-serialization: Retried waiting for GCLocker too often allocating 7864726 wordsTerminating process - Error starting transactor
org.h2.jdbc.JdbcSQLNonTransientConnectionException: File corrupted while reading record: "/Users/petrus/datomic/1.0.7394/data/db/datomic.mv.db". Possible solution: use the recovery tool [90030-214]
...
Caused by: org.h2.mvstore.MVStoreException: Double mark: 1b/31 [16-18, 1b-36, 3e-44, e643-] [2.1.214/6]
Joe Lane 2025-10-21T14:01:00.192189Z
H2 has no guarantees about what happens when an OOM is thrown (which is what happened here). That is why we consider it a dev storage protocol.
👍 1
evocatus 2025-10-21T10:29:27.607899Z
What are my options if I want to use Datomic from another language (like Go or Rust)? The official REST API is marked as legacy.
Build a very light weight RPC in Clojure the call the RPC from other languages
👍 1
I have an a little bit different answer. • For Write part, you can only use light weight RPC method. • For Read part, you can have another route: sync the Datomic to Postgres using Plenish and then query using SQL. (time travel not supported) • https://gaiwan.co/blog/solving-datomic-bi-integration-why-we-built-plenish/ • https://github.com/lambdaisland/plenish
👍 3
Thanks for sharing! I did not know about plenish until now. Looks useful!
🙌 1