It could be an artifact of reloading plugin configurations if you have a lot of remap rules with plugins, although internally ATS should do the load and then swap the configuration. During the down time, does ATS process any traffic, or there is traffic but no caching?
On Thu, Jan 10, 2019 at 10:53 AM Miles Libbey <[email protected]> wrote: > We don't experience downtime when using traffic_ctl config reload (we > use that ~daily). > > We don't use the balancer plugin. Instead, we use parent.config > ( > https://docs.trafficserver.apache.org/en/8.0.x/admin-guide/files/parent.config.en.html > ) > to achieve the same consistent hash. Your config would translate to > > remap.config > map / http://127.0.0.1 @plugin=cachekey.so > @pparam=--include-params=p0,p1 @pparam=--sort-params=true > > parent.config > dest_domain=. scheme=http > parent="123.123.123.1:80,23.123.123.2:80,123.123.123.3:80,123.123.123.4:80 > " > round_robin=consistent_hash go_direct=false > dest_domain=. scheme=https > parent="123.123.123.1:443,23.123.123.2:443,123.123.123.3:443, > 123.123.123.4:443" > round_robin=consistent_hash go_direct=false > > miles > > On Wed, Jan 9, 2019 at 10:53 PM Hobin Yoon <[email protected]> wrote: > > > > Hi, > > > > We are noticing there is quite a bit of delay when we reload the config > with traffic_ctl config reload. The delay is up to about 30 seconds, during > which period we don't get any caching. We are using consistency hashing > plugin. The number of nodes changes dynamically between 5 to 30. > > > > Here is an example balancer (consistent hash) configuration in > remap.config. > > > > map / http://127.0.0.1 @plugin=cachekey.so > @pparam=--include-params=p0,p1 @pparam=--sort-params=true > @plugin=balancer.so @pparam=--policy=hash,key @pparam=123.123.123.1 > @pparam=123.123.123.2 @pparam=123.123.123.3 @pparam=123.123.123.4 ... > > > > Is this downtime normal? How do you guys avoid the service downtime > while reconfiguring the cache nodes in the cluster? > > > > Hobin > > > > > > > > > > > -- *Beware the fisherman who's casting out his line in to a dried up riverbed.* *Oh don't try to tell him 'cause he won't believe. Throw some bread to the ducks instead.* *It's easier that way. *- Genesis : Duke : VI 25-28
