Split out step resource request management #1655
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Before this change, all steps' resource requests (*not* limits) were zeroed out unless that value for that metric represented the maximum across all steps. If step 2 requested the maximum memory of all steps, but not the max CPU, its memory request would persist but its CPU request would be zeroed out. After this change, the max request for each resource type (CPU, memory, ephermeral storage) is calculated, then applied to the *last* step's container. The effect is the same, unless Pods' resource requests are updated to account for exited containers (afaik they're not), and this is simpler to express and explain. And since all the code for this is in its own method and file, it's easier to test in isolation.
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Before this change, all steps' resource requests (not limits) were
zeroed out unless that value for that metric represented the maximum
across all steps. If step 2 requested the maximum memory of all steps,
but not the max CPU, its memory request would persist but its CPU
request would be zeroed out.
After this change, the max request for each resource type (CPU, memory,
ephermeral storage) is calculated, then applied to the last step's
container. The effect is the same, unless Pods' resource requests are
updated to account for exited containers (afaik they're not), and this
is simpler to express and explain. And since all the code for this is in
its own method and file, it's easier to test in isolation.
Fixes #1605
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