Re: [EXTERNAL] Re: Connection Pooling in v4.x Java Driver

["Caravaggio, Kevin" <ke...@lowes.com>]

Hi Alexandre,


Thank you for the explanation. I understand that reasoning very well now.

Jon, appreciate the link, and will follow up there for this sort of thing then.


Thanks,


Kevin
From: Alexandre Dutra <al...@datastax.com>
Reply-To: "user@cassandra.apache.org" <us...@cassandra.apache.org>
Date: Wednesday, December 11, 2019 at 3:33 AM
To: "user@cassandra.apache.org" <us...@cassandra.apache.org>
Subject: [EXTERNAL] Re: Connection Pooling in v4.x Java Driver


*EXTERNAL SENDER*

Hi,

In driver 4.x, pools do not resize dynamically anymore because the ratio between concrete benefits brought by this feature and the maintenance burden it caused was largely unfavorable: most bugs related to connection pooling in driver 3.x were caused by the dynamic pool resizing. Having a fixed pool size made driver 4.x pool implementation much more straightforward and robust.

Thanks,

Alex Dutra


On Tue, Dec 10, 2019 at 7:13 PM Jon Haddad <jo...@jonhaddad.com>> wrote:
I'm not sure how closely the driver maintainers are following this list. You might want to ask on the Java Driver mailing list: https://groups.google.com/a/lists.datastax.com/forum/#!forum/java-driver-user<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__groups.google.com_a_lists.datastax.com_forum_-23-21forum_java-2Ddriver-2Duser%26d%3DDwMFaQ%26c%3Dadz96Xi0w1RHqtPMowiL2g%26r%3D-4a_H5oaBvlvMCJS3nMc0tpTTKGn9aXRaK9-aUPruik%26m%3DJx5gtMMrBVRkCsov03DMaauB_eEaFXAH27tt5P92ocs%26s%3D33hNmSDIOrCXZpQkgaLrhmG1_PiiZtq6A9cU21_QvYg%26e%3D&data=02%7C01%7Ckevin.caravaggio%40lowes.com%7C12db624b9feb427e36d708d77e2ddee1%7Cbcfa3e87841e48c7983b584159dd1a69%7C0%7C0%7C637116607802385179&sdata=%2FEf1yJvaSBqFymYKqxYW9TN7wxjWqsQB5YWikmemMEk%3D&reserved=0>




On Tue, Dec 10, 2019 at 5:10 PM Caravaggio, Kevin <ke...@lowes.com>> wrote:
Hello,


When integrating with DataStax OSS Cassandra Java driver v4.x, I noticed “Unlike previous versions of the driver, pools do not resize dynamically”<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.datastax.com%2Fen%2Fdeveloper%2Fjava-driver%2F4.2%2Fmanual%2Fcore%2Fpooling%2F%23configuration&data=02%7C01%7Ckevin.caravaggio%40lowes.com%7C12db624b9feb427e36d708d77e2ddee1%7Cbcfa3e87841e48c7983b584159dd1a69%7C0%7C1%7C637116607802395172&sdata=LcEwc6uu4ZqajzYG0fUTuRNLzzldH48vfT0ae7ARkco%3D&reserved=0> in reference to the connection pool configuration. Is anyone aware of the reasoning for this departure from dynamic pool sizing, which I believe was available in v3.x?


Thanks,


Kevin

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Alexandre Dutra  |  Technical Manager, Drivers

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