Istvan Toth created CALCITE-5009: ------------------------------------ Summary: Remove transaparent jdbc connection re-creation code Key: CALCITE-5009 URL: https://issues.apache.org/jira/browse/CALCITE-5009 Project: Calcite Issue Type: Bug Components: avatica Reporter: Istvan Toth
Currently, if the server-side JDBC connection goes away for any reason * Avatica connection cache expiry * LB/HA Failover * Some problem with the "real" connection we attempt to create a new "real" JDBC connection, and continue using that instead of the original connection [https://github.com/apache/calcite-avatica/blob/fbdcc62745a0e8920db759fb6bdce564d854e407/core/src/main/java/org/apache/calcite/avatica/AvaticaConnection.java#L796] This is fine for most read-only connections, but it can break transaction semantics, which is captured in the "real" connection object. {noformat} conn.setAutocommit(false) stmt = conn.createStatement() execute(insert A) //Connection lost and object recreated which now proxies a new "real" connection execute(insert B) conn.commit() //We have lost "insert A"{noformat} I'm not sure if we synchronize autocommit state of the new connection to the lost one or not, but it's bad either way. We should either completely drop this feature, add some logic that avoids it if there is an open transaction and/or only allow it for connections that have the readOnly flag set. -- This message was sent by Atlassian Jira (v8.20.1#820001)