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https://issues.apache.org/jira/browse/AMBARI-21000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027506#comment-16027506
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Siddharth Wagle commented on AMBARI-21000:
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+1 the patch looks good to me.
> Ambari does not work with PGBouncer/PostgreSQL
> ----------------------------------------------
>
> Key: AMBARI-21000
> URL: https://issues.apache.org/jira/browse/AMBARI-21000
> Project: Ambari
> Issue Type: Bug
> Affects Versions: 2.5.2
> Reporter: Robert Yokota
> Fix For: 2.5.2
>
> Attachments: AMBARI-21000.01.patch
>
>
> When using JDBC with PGBouncer (a connection pooler for PostgreSQL), prepared
> statements must be disabled on the client side. According to the PgBouncer
> FAQ, this is done by passing "prepareThreshold=0" in the JDBC URL. Even when
> using "prepareThreshold=0", Ambari returns errors of the form "prepared
> statement "S_1" does not exist". This is because Ambari uses Quartz, which
> uses C3P0. Quartz by default configures C3P0 to cache prepared statements by
> setting maxStatementsPerConnection=120. Fortunately, Quartz also allows you
> to override this C3P0 setting by passing a property named
> "maxCachedStatementsPerConnection". When setting this property to 0 (which
> is the default in C3P0), then Ambari works properly with PGBouncer.
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