Github user Randgalt commented on the issue:
https://github.com/apache/zookeeper/pull/377
Controlling TTL Nodes via zoo.cfg turned out to be untennable. There are
too many parts of the code that need to know about TTLs being enabled or not.
The previous PR had several holes relating to this. This new commit changes the
enabled/disabled mechanism to be a System property so that it can be accessed
anywhere in the code. It's also been renamed something more general so that it
can be applied to future features and not just TTLs.
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