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datalevin
Aleks 2024-09-30T16:18:28.699039Z
Hello! When I create a new client from dtlv repl, on the server log I see Added client #uuid ... for user ... Then if I exit the repl, this client isn't dropped. If any way to reuse it when I repl again? Or dropped it after leaving the repl. If no, seems like clients increases every time you created a new one.
Huahai 2024-10-05T00:42:24.178309Z
Unable to reproduce
Aleks 2024-09-30T16:40:54.614399Z
Now I get this
(show-clients dc)
Request to Datalevin server failed: "datalevin.datom.Datom cannot be cast to java.lang.Comparable"Huahai 2024-09-30T17:42:24.492609Z
Idle clients are cleaned after a while.
Huahai 2024-09-30T17:43:36.418649Z
There's a thread on server dedicated to clean up resources.
Huahai 2024-09-30T17:46:12.400729Z
Note that there's no way to know if a client is dropped, e.g. the machine crashed, etc. Other than having a heartbeat (more expensive), cleaning up idle clients after a timeout is the cheapest solution.
Huahai 2024-09-30T17:46:57.629289Z
For the error, if you can have a reproducible case, that would be great.
Aleks 2024-09-30T18:49:00.504789Z
It's hard to say exactly steps to reproduce, but in general it looks like this: 1. start server with dtlv serv 2. get-conn from my app (for a normal user) 3. create a new client from dtlv repl (for datalevin user) 4. execute (show-clients ...) 2 times
Aleks 2024-09-30T18:49:33.799009Z
right now I've got it again
(def dc (new-client ""))
#'user/dc
(show-clients dc)
{#uuid "5beabc6e-6bae-42b8-b683-1a0e6750d553" {:ip "/127.0.0.1", :username "datalevin", :roles [:datalevin.role/datalevin], :permissions [[:datalevin.server/control :datalevin.server/server] [:datalevin.server/create :datalevin.server/database "foxcub"] [:datalevin.server/create :datalevin.server/database "foxcub"]], :open-dbs {"foxcub" {:datalog? true, :dbis #{}}}}, #uuid "a2e25e6c-03fb-403a-aa34-52ab9389f715" {:ip "/127.0.0.1", :username "datalevin", :roles [:datalevin.role/datalevin], :permissions [[:datalevin.server/control :datalevin.server/server] [:datalevin.server/create :datalevin.server/database "foxcub"] [:datalevin.server/create :datalevin.server/database "foxcub"]], :open-dbs {}}, #uuid "102a48a1-e522-4318-829c-d117797cf18b" {:ip "/127.0.0.1", :username "lava", :roles [:datalevin.role/lava], :permissions [[:datalevin.server/view :datalevin.server/role nil] [:datalevin.server/alter :datalevin.server/user "lava"] [:datalevin.server/alter :datalevin.server/database "foxcub"]], :open-dbs {"foxcub" {:datalog? true, :dbis #{}}}}}
(show-clients dc)
Request to Datalevin server failed: "datalevin.datom.Datom cannot be cast to java.lang.Comparable"
user> Aleks 2024-09-30T18:50:34.312509Z
and stacktrace from the server
Request to Datalevin server failed: "datalevin.datom.Datom cannot be cast to java.lang.Comparable"
user>
...
clojure.core/map/fn core.clj: 2772
clojure.core/partial/fn core.clj: 2641
datalevin.server/client-display server.clj: 1029
clojure.core/update core.clj: 6232
datalevin.server/client-display/fn server.clj: 1032
clojure.core/mapv core.clj: 6971
clojure.core/reduce core.clj: 6886
...
clojure.core/mapv/fn core.clj: 6980
datalevin.server/client-display/fn/fn server.clj: 1036
datalevin.server/perm-tgt-name server.clj: 218
datalevin.server/eid->db-name server.clj: 179
datalevin.pull-api/pull pull_api.clj: 322
datalevin.pull-api/pull pull_api.clj: 314
datalevin.pull-api/pull-impl pull_api.clj: 285
datalevin.pull-api/attrs-frame pull_api.clj: 268
datalevin.db.DB/-range-datoms db.clj: 115
datalevin.utl.LRUCache.put LRUCache.java: 36
java.util.Collections$SynchronizedMap.put Collections.java: 2598
java.util.HashMap.put HashMap.java: 608
java.util.HashMap.putVal HashMap.java: 640
java.util.HashMap.treeifyBin HashMap.java: 768
java.util.HashMap$TreeNode.treeify HashMap.java: 2000
java.util.HashMap.compareComparables HashMap.java: 373
...
java.lang.ClassCastException: datalevin.datom.Datom cannot be cast to java.lang.ComparableHuahai 2024-09-30T18:51:24.984679Z
thanks, will take a look.
🙏🏻 1
Aleks 2024-09-30T19:17:20.307139Z
> cleaning up idle clients after a timeout is the cheapest solution I agree. Thanks for letting me know about this option