Github user weifensh commented on the issue:
https://github.com/apache/incubator-trafficcontrol/pull/16
Thanks Dave and Trevor.
From my test, a DB file may be deleted if its polling.url points to a file
with old timestamps; Or when TR reboots, DB file might also be deleted (because
the url is now an old file comparing to the local one); But this does not
appear to affect TR service, as the DB in memory are still there, so it is just
the file under /opt/traffic_router/db/ being deleted.
So it appears that the affect of the issue is not big, but the files under
/opt/traffic_router/db/ do look abnormal. It would be better if 1.7.x could
include the fix. But if it needs a lot of efforts, not including it will not
affect TR functionalities.
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