Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/704
> I looked at the code and I am not of the opinion the code assumes
HOST_DB_TIMEOUT_INTERVAL is > one second. For instance, in
HostDBContinuation::backgroundEvent it is explicitly scaled by
> HRTIME_SECOND which is the opposite of assuming it is the specific value
one second.
``HOST_DB_TIMEOUT_INTERVAL`` is in ``hrtime`` units, but the code only
works if it is 1 sec. For example, the mtime of the file is used equivalently
to the intervals, which can only work if the interval is 1sec, which can only
happen if ``HOST_DB_TIMEOUT_INTERVAL`` is 1sec.
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