Backport of drivers/raw_exec: enable configuring raw_exec task to have no memory limit into release/1.7.x #19690
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Backport
This PR is auto-generated from #19670 to be assessed for backporting due to the inclusion of the label backport/1.7.x.
🚨
The person who merged in the original PR is:
@shoenig
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.
The below text is copied from the body of the original PR.
This PR makes it possible to configure a raw_exec task to not have an
upper memory limit, which is how the driver would behave pre-1.7.
This is done by setting memory_max = -1. The cluster (or node pool) must
have memory oversubscription enabled.
Closes #19670
Backport to 1.7 so users can re-enable behavior from before.
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