From: "kuroda.hayato@fujitsu.com" <kuroda.hayato@fujitsu.com>
To: "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Subject: [Proposal] Add foreign-server health checks infrastructure
Thread-Topic: [Proposal] Add foreign-server health checks infrastructure
Thread-Index: AdfNNjec7xk22WznTt+52qg+YpAmvA==
Date: Sat, 30 Oct 2021 03:50:15 +0000
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--_002_TYAPR01MB58662809E678253B90E82CE5F5889TYAPR01MB5866jpnp_
Content-Type: text/plain; charset="iso-2022-jp"
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Dear Hackers,

I want to propose the feature that checks the health of foreign servers.=20
As a first step I want to add an infrastructure for periodical checking to =
PostgreSQL core.
Currently this is the WIP, it does not contain docs.

## Background=20

Currently there is no way to check the status of an foreign server in Postg=
reSQL.
If an foreign server's postmaster goes down, or if the network between serv=
ers is lost,
the backend process will only detect these when it uses the connection corr=
esponding to that foreign server.

Consider a workload that updates data on an foreign server only at the begi=
nning of a transaction,
and runs a lot of local SQLs. Even if the network is disconnected immediate=
ly after accessing the foreign server,
the backend process will continue to execute local SQLs without realizing i=
t.

The process will eventually finish to execute SQLs and try to commit.
Only then will it realize that the foreign server cannot be connect and wil=
l abort the transaction.
This situation should be detected as soon as possible
because it is impossible to commit a transaction when the foreign server go=
es down.
This can be more of a problem if you have system-wide downtime requirements=
.
That's why I want to implement the health-check feature to postgres.

## Design

In general, PostgreSQL can have a variety of RDBMSs as foreign servers,
so the core cannot support all of them.
Therefore, I propose a method to leave the monitoring of the foreign server=
 to each FDW extensions
and register it as a callback function on the body side.
The attached patch adds this monitoring infrastructure to core.
Within the callback functions, it is expected
that each FDWs will check the state of the connection they hold and call er=
eport (ERROR)
if it cannot connect to someone.
Of course, you can also have the callback function return false.
There is no particular reason to choose the current method.
Callback functions will be called periodically.

## Implementation

This patch introduces a new timeout and a new GUC parameter. GUC controls t=
he timeout interval.
The timeout takes effect when the callback function is first registered,
before each SQL command is executed, and at the end of the timeout.
This implementation is based on the client_connection_check_interval and ot=
her timeouts.

## Further work

As the next step I have a plan to implement the callback function to postgr=
es_fdw.
I already made a PoC, but it deeply depends on the following thread:
https://commitfest.postgresql.org/35/3098/

I also want you to review the postgres_fdw part,
but I think it should not be attached because cfbot cannot understand such =
a dependency
and will throw build error. Do you know how to deal with them in this case?

Your comments and suggestions are very welcome.

Best Regards,
Hayato Kuroda
FUJITSU LIMITED


--_002_TYAPR01MB58662809E678253B90E82CE5F5889TYAPR01MB5866jpnp_
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Content-Disposition: attachment;
	filename="v01_add_checking_infrastracture.patch"; size=12189;
	creation-date="Sat, 30 Oct 2021 03:49:55 GMT";
	modification-date="Sat, 30 Oct 2021 03:35:40 GMT"
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