https://bz.apache.org/bugzilla/show_bug.cgi?id=62598
Bug ID: 62598
Summary: support pool with multiple JDBC data sources
Product: Tomcat Modules
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P2
Component: jdbc-pool
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
We are using Tomcat to access "read-only" databases. For scaling and for fail
over, multiple databases are deployed (different physical locations, etc).
The request: would like to be able to create a connection pool that will return
connections from ANY of those configured databases. This has big value for
* Load balancing
* Fail Over
Many JDBC drivers provide such functionality in proprietary form (Oracle "thin"
client, Sybase HA connections, ...). However, this solution is less than ideal.
* Complex to configure, each driver is different, some drivers require server
side configurations
* Difficult to monitor with JMX (see below for wishlist).
* Does not work across database from different vendors.
Compare this with WebLogic JDBC Multi Source:
https://docs.oracle.com/middleware/1213/wls/JDBCA/jdbc_multidatasources.htm#JDBCA209)
The ASK - provide functionality similar to WebLogic Multi-Source connection:
* Define a connection pool that "merges" connection from other sources
* Ability to configure primary list
* Ability to configure backup list, which will be used if all (or some)
primaries are down
Nice to have:
* Expose status to JMX
* Allow JMX to update the primary list and backup list (enable/disable
individual entries, for planned maintenance, etc).
The configuration directive can look like:
<Resource name="jdbc/multiDB"
auth="Container"
type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.MultiSourceFactory"
primary="jdbc/conn-1,jdbc/conn-2,jdbc/conn-3,..."
backup="jdbc/backup-ds-1,jdbc/backup-ds-2,jdbc/backup-ds-3,..."
>
Where 'conn-1' ... 'backup-ds-3' are other JDBC pools that were defined.
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