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From Samarth Jain <sama...@apache.org>
Subject Re: How to set up different phoenix timeout values for different client applications?
Date Wed, 09 Mar 2016 17:03:28 GMT
Hi Simon,

phoenix.query.timeoutMs is a client side phoenix property. You can set it
in client side hbase-site.xml for a global setting or can programmatically
set it on per jdbc statement via stmt.setQueryTimeout(int seconds).

There are a couple other hbase level timeouts that are in play:

hbase.client.scanner.timeout.period default value of 60 seconds
Starting from just released phoenix 4.7, phoenix automatically renews
scanner leases so that applications don't run into errors arising out of
scanner lease expiration. So using a default value for this should be fine.
To take advantage of this feature you would need to use an HBase version of
that is as new as 0.98.17 for HBase-0.98, 1.0.3 for HBase-1.0 and 1.1.3 for
HBase-1.1.

hbase.rpc.timeout - default value of 60 seconds

By default, Phoenix connections on a JVM share a single HConnection to a
cluster. If you want different HConnections with their own phoenix and
hbase level settings, you can do that by supplying a different principal or
user string as described here: https://phoenix.apache.org/#SQL_Support.
This is a good option if your different applications are running on the
same JVM and they have different performance characteristics. This is also
a good option if you are using a pre-4.7 release and need to have different
hbase.client.scanner.timeout.period values for your applications.

Hope this helps.
- Samarth




On Tue, Mar 8, 2016 at 5:12 PM, Simon Lee <simon@marketo.com> wrote:

> Hi all,
>
> What is the best way to set up different phoenix query timeout values for
> different client applications? Suppose there are 5 different Phoenix client
> applications. These applications have different timeout requirements due to
> the characteristics of the applications. For example, the timeout
> requirements are
>
> Application A is 60,000 milliseconds
> Application B is 1,200,000 milliseconds
> Application C is 600,000 milliseconds
> Application D and application E are 300,000 milliseconds
>
> Currently, the phoenix.query.timeoutMs in hbase-site.xml on the region
> servers is set to 300,000 milliseconds
>
> If phoenix.query.timeoutMs is set to 60,000 milliseconds on the client
> machine where application A is located, will the value on the client
> (60,000) override the value on the region server (300,000), so the
> application’s A query will time out after 60,000 milliseconds?
>
> If phoenix.query.timeoutMs is set to 1,200,000 milliseconds on the client
> machine where application B is located, will the value on the client
> (1,200,000) override the value on the region server (300,000), so the
> application’s B query will not time out after 300,000 milliseconds?
>
> The factory default value of phoenix.query.timeoutMs is 600,000. If
> timeout value is not set on the client machine where application C is
> located, and timeout value is set on the region servers, will the factory
> default value on the client (600,000) override the value on the region
> server (300,000)? If so, the timeout value on the region server will never
> take effect.
>
> Thanks!
>
>
>
>

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