Re: performance problem of Failover Datasource?

On Thu, Dec 13, 2012 at 6:42 AM, Chen Huajun <chenhj@cn.fujitsu.com> wrote:

Hi All,


In the latest jdbc driver,multi backends can be assigned in the URL as following.

>With latest jdbc drivers you can simply configure multiple host:port pairs in the url separated by comma:
>jdbc:postgresql://host1:port1,host2:port2/test
>It has only the most basic failover support. When a new connection is opened the hosts are tried in round-robin until a connection is successfully established.

But there is a performance problem .if the first host is down,
all connecting must be blocked until connect timeout at first,
and then try connect to the next host.

Why not adjust the order of hosts dynamically?
For excample, after a successful connecting,if the target host is not the first host,
swap the target host and the first host.
And then subsequent connecting will try the most suitable host at first.


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Best Regards，
Chen Huajun
(2012/12/12 17:09), kaprikorn07 wrote:

Hi All,

As Bruce Adams has mentioned, please let me know if there is any other way
to do it other than pgBouncer and pgPool.

Please help!



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