investigate halt of scheduling for one of many tasks in collector's scheduler
Affected is the current HEAD of the master branch.
The scheduling of updateindex was stopped w/o any exception/warning whatsoever.
Positive about this is that the other scheduled tasks were not affected.
First steps:
- add some logging to threads of the thread-pool
- maybe, use other ways to study this behavior
- implement a solution based on the facts found in the steps above.