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scheduler: system scheduler should reconcile overlapping live allocs #16097

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scheduler: system scheduler should reconcile overlapping live allocs #16097

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Commits on Mar 15, 2023

  1. scheduler: system scheduler should reconcile overlapping live allocs 

    The system scheduler uses a separate code path for reconciliation. During the
investigation into the "plan for node rejected" bug which was fixed in #16401,
it was discovered this code path doesn't maintain the invariant that no more
than 1 allocation per system job task group (or `count` allocations for sysbatch
jobs) should be left running on a given client. While this condition should be
impossible to encounter, the scheduler should be reconciling these cases.

Add a new `ensureSingleSystemAlloc` function that enforces the invariant that
there can be only a single desired-running allocation for a given system job on
a given node.
    @tgross
    tgross committed Mar 15, 2023
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