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From "Matthieu Baechler (JIRA)" <server-...@james.apache.org>
Subject [jira] [Created] (JAMES-2605) Cassandra MailQueue implementation has a 20% fail rate on load
Date Wed, 21 Nov 2018 10:59:00 GMT
Matthieu Baechler created JAMES-2605:
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             Summary: Cassandra MailQueue implementation has a 20% fail rate on load
                 Key: JAMES-2605
                 URL: https://issues.apache.org/jira/browse/JAMES-2605
             Project: James Server
          Issue Type: Bug
          Components: cassandra
            Reporter: Matthieu Baechler


RabbitMQ + Cassandra implementation of Mailqueue proved to be brittle, we have around 20%
error rate for SMTP mail delivery under heavy load.

It's probably linked to the heavy use of parallelism into Cassandra Mailqueue code that can
submit an unbounded numer of request for a single Mailqueue operation.

 

We should try to remove this unbounded parallelism and check the failure rate under load.



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