Handle restart cases and add more logging to Eclipselink

[singhpk234]

About the change

1. Add the ecpliselink getting started to capture SQL queries in server logs to enable debugging
2. Fix the case when the docker images is restarted again by purging the realm first before starting
   a/ we can do alterantive as well before stopping purge the realm.

[eric-maynard]

This is a little scary; it's probably fine since this is a getting started image but technically anyone who's been using this may be surprised to find their metastore purged when they update their code

[singhpk234]

Agree with you, the current behaviour is it that it, always tries to bootstrap, which fails the whole process if this has been run before, so one is expected to remove this step or run the purge, one other way imho is to see its a clean getting started .

[eric-maynard]

Is there a way we can have it still fail if you need purge, but we allow you to re-run docker with some simple flag that causes the purge command to run? That way we don't risk someone accidentally purging, but we still improve the frustrating UX you describe.

If not, I am ok to go forward with the PR as written.

[MonkeyCanCode]

Maybe consider use env to control it? If we need to purge, set the env which then set the command to this one. If not set, then fallback default commend (or do nothing).

[adutra]

We can remove this container, but the issue, as @singhpk234 noted, is that if you shut down the containers, then run them again, the realm will be already bootstrapped and polaris-bootstrap will fail.

We don't have currently a way to say "ignore already-bootstrapped realms" when running the bootstrap command. I was planning to add that, but got side-tracked. That would imho be the best "fix" for the issue here.

[eric-maynard]

I like @adutra's idea of a flag to ignore already-bootstrapped realms. @singhpk234 do you think that would solve the problem sufficiently?

[singhpk234]

idea of a flag to ignore already-bootstrapped realms

@eric-maynard I agree, This is a nice suggestion, and could handle this restart issue fairly ! @adutra please let me know if i can help somehow in getting this in.