[SAK-40742] Assignments / duplicate submission issue - Sakai

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Test Plan:
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Create a site with a hundred users or so, such as the default site of SMPL 101 Spring 2018

In the assignments tool, create a new assignment

Log in to Sakai in multiple browsers as the instructor and move both to the Assignments tool

On the first window, select Grade/View Submissions on the assignment you just created

Within a second or two click the same link on the second browser

As a student in the site, try to access the Assignments tool.
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Create a site with a hundred users or so, such as the default site of SMPL 101 Spring 2018 In the assignments tool, create a new assignment Log in to Sakai in multiple browsers as the instructor and move both to the Assignments tool On the first window, select Grade/View Submissions on the assignment you just created Within a second or two click the same link on the second browser As a student in the site, try to access the Assignments tool.

To replicate:

On nightly, create a site with a hundred users or so. I used the default site of SMPL 101 Spring 2018.

In the assignments tool, create a new assignment

On the first window, select Grade/View Submissions on the assignment you just created

Within a second or two click the same link on the second browser

As a student in the site, try to access the Assignments tool.

The attach stack trace is displayed.

is depended on by

SAK-40817 Assignments: Instructor receives error when clicking on Grade and no students have submitted

is related to

SAK-40875 Assignment Automatic Duplicate Submission cleanup

relates to

SAK-40405 Assignments service vulnerable to duplicate submission race condition