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Type: Improvement
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Resolution: Unresolved
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Priority: Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Currently we have documented for mongoc_client_set_read_concern:
It is a programming error to call this function on a client from a mongoc_client_pool_t. For pooled clients, set the read concern with the MongoDB URI instead.
I believe the reason it is considered a programming error is that it persists on the mongoc_client_t even after being pushed back onto the pool. For example:
pool = mongoc_client_pool_new (uri); client = mongoc_client_pool_pop (pool); rc = mongoc_read_concern_new (); mongoc_read_concern_set_level (rc, MONGOC_READ_CONCERN_LEVEL_AVAILABLE); mongoc_client_set_read_concern (client, rc); mongoc_client_pool_push (pool, client); client = mongoc_client_pool_pop (pool); level = mongoc_read_concern_get_level (mongoc_client_get_read_concern (client)); printf ("rc=%s\n", level); /* prints "rc=available" */ mongoc_read_concern_destroy (rc);
This behavior seems surprising and error prone. I think the same applies to write concern and read preference. I think it would be simple enough to have mongoc_client_pool_push reset its state (clear the read/write concern and read preference) before being pushed back onto a pool.
- is depended on by
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CXX-1939 Revisit deprecation of client read_concern, write_concern, and read_preference methods
- Backlog
- is duplicated by
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CDRIVER-3878 reset client options when returning to a mongoc_client_pool
- Closed
- is related to
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CDRIVER-938 Prohibit setting options on pooled clients
- Backlog