Enable direct access by default

[mtrezza]

Is your feature request related to a problem? Please describe.

• Direct access of Parse Server within Cloud Code is feature flagged for some time.
• It is used in production environments by some without feedback of any major issues.
• Given the potential for significant performance improvement for Parse Server deployments without any code changes necessary, it would be beneficial to move it out of its experimental state and enable it by default.

Describe the solution you'd like
Identify any issues, remove the feature flag, maybe enable by default, see #6637 (comment).

Additional context

• Continuation of Questions about Direct Access Feature #5442
• Direct access was merged feature flagged in Support direct access server option #5550

Related PRs

• Enable direct access by default #6636

Related discussions

• Performance slow? #4658

[mtrezza]

As quick performance test for directAccess here is a load test for a _User query by objectId:

response time	status quo	direct access
avg.	193.02ms	64.69ms
min	9ms	9ms
p95	459ms	279ms
p99	611ms	427ms

This shows that it's well worth pursuing this feature.

[dplewis]

Check out #6636 (comment)

[mtrezza]

In a previous series of load testing, we realized that JSON serialization of large objects was a large source of CPU consumption, and was inducing latency in the responses as serialization is blocking the node process.

In our case, we decided not to go with the direct access but to let internal cloud code calls reach another server, as it was the most optimal solution for our workload

This means that enabling directAccess by default can be a breaking change as described in #4658 (comment), so maybe it should be disabled by default?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mtrezza]

Closed by #6636

[gtzinos]

Anyone we found a way to deal with undefined values?