Github user nkalmar commented on the pull request:
https://github.com/apache/zookeeper/commit/a2623a625a4778720f7d5482d0a66e9b37ae556f#commitcomment-29917129
@maoling , the problem is, there is no security implemented. Anyone user
who can access ZooKeeper, can send commands to the ensemble. While all 4ltw
commands is read-only, some takes quite some time, so a DOS attack is actually
possible.
So it has been deemed unsecure and deprecated, as far as I know. Originally
I implemented the 4ltw command for this PR but the I was suggested to remove
from 3.6 and 3.5
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