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Posted to issues@ignite.apache.org by "Stanislav Lukyanov (JIRA)" <ji...@apache.org> on 2019/03/04 17:29:00 UTC

[jira] [Commented] (IGNITE-11471) JDBC: Thin driver should start with a random server to connect

    [ https://issues.apache.org/jira/browse/IGNITE-11471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16783581#comment-16783581 ] 

Stanislav Lukyanov commented on IGNITE-11471:
---------------------------------------------

Choice of the server was random initially, but it was changed to a JVM-local round-robin in IGNITE-9704.

Need to use keep the `AtomicLong` for local round-robin, but initialize it with a random value instead of zero.

> JDBC: Thin driver should start with a random server to connect
> --------------------------------------------------------------
>
>                 Key: IGNITE-11471
>                 URL: https://issues.apache.org/jira/browse/IGNITE-11471
>             Project: Ignite
>          Issue Type: Improvement
>          Components: jdbc
>            Reporter: Stanislav Lukyanov
>            Priority: Major
>              Labels: newbie
>
> Thin JDBC driver uses a list of server addresses to connect to. Connections created in a single JVM will use round-robin to choose the server to connect, yielding a uniform distribution. However, the round-robin always starts from the first server in the list. It means that multiple JVMs with the same JDBC connection URL and one connection each will all connect to the same server.
> Need to choose the first server randomly to have a better distribution.



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