[source-postgres] use tcpAlive=true to make JDBC connection more robust upon backpressure

[theyueli]

What

A possible improvement which will make JDBC connection not get dropped when there is backpressure.

Related to https://github.com/airbytehq/airbyte-internal-issues/issues/7

Solves part of https://github.com/airbytehq/oncall/issues/6315

Can this PR be safely reverted and rolled back?

• [x ] YES 💚
• NO ❌

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[evantahler]

This is one of the solutions to https://github.com/airbytehq/oncall/issues/6315

[rodireich]

Looks good to me (I was under the impression we already had keepalive turned on in the JDBC connection).
You might want to consider, or later consider doing this on the hikari pool config

config.keepaliveTime = ???

[theyueli]

hikari pool config

Looks good to me (I was under the impression we already had keepalive turned on in the JDBC connection). You might want to consider, or later consider doing this on the hikari pool config

config.keepaliveTime = ???

@rodireich great finding!! Do you know what value we shall set? I was overwhelmed by these parameters, there is another one called idle timeout ... is that related?

https://docs.oracle.com/cd/E19159-01/819-3681/abehq/index.html