Github user mccheah commented on the issue:
https://github.com/apache/spark/pull/22608
It depends on how we're getting the Hadoop images. If we're building
everything from scratch, we could run everything in one container - though
having a container run more than one process simultaneously isn't common. It's
more common to have a single container have a single responsibility / process.
But you can group multiple containers that have related responsibilities into a
single pod, hence we'll use 3 containers in one pod here.
If we're pulling Hadoop images from elsewhere - which it sounds like we
aren't doing in the Apache ecosystem in general though - then we'd need to
build our own separate image for the KDC anyways.
Multiple containers in the same pod all share the same resource footprint
and limit boundaries.
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