Soft coordinator shutdown #14331
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Soft coordinator shutdown #14331
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Co-authored-by: Jan <jsteemann@users.noreply.github.com>
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This adds the soft shutdown feature for coordinators for the 3.7
branch. This is a backport from devel.
Here is the design document:
https://github.com/arangodb/documents/blob/master/DesignDocuments/03_IN_PROGRESS/SoftShutdownCoordinators.md
The basic idea is to allow to put a coordinator into a "soft shutdown
mode" in which it finishes ongoing work but does no longer accept
new work. This should make restarting or upgrading coordinators less
intrusive for clients.
This is an unfinished. Since the soft coordinator shutdown relies on the features of >= 3.8 of tracking ongoing low prio queue work, which has not been backported to 3.7, further work is necessary here. It does not even compile.