I’m having difficulty setting exp_pager_stime. I’ve run the following command for each node in the cluster:
/opt/couchbase/bin/cbepctl host:port set flush_param exp_pager_stime 60
which returns:
setting param: exp_pager_stime 60
set exp_pager_stime to 60
However, all expired items are only being removed once an hour. I do see a few items removed every minute, but not all. When I change exp_pager_stime to 120, I start to see the handful of removals occurring every two minutes. So it appears the change is doing something, but the process that runs every 60 or 120 seconds doesn’t fully remove the expired items. However, I do see a full removal happen every hour at the same time.
I have confirmed that ep_num_expiry_pager_runs (reported from cbstats) increments every minute or 2 minutes based on my configuration, so it does seem that it’s running, just not having a real effect.
When I use cbstats to query the current exp_pager_stime I get very curious results.
$ /opt/couchbase/bin/cbepctl host:port set flush_param exp_pager_stime 60;
setting param: exp_pager_stime 60
set exp_pager_stime to 60
$ /opt/couchbase/bin/cbstats host:port all | grep exp_pager_stime;
ep_exp_pager_stime: 28920
$ /opt/couchbase/bin/cbstats host:port config | grep exp_pager_stime;
ep_exp_pager_stime: 14460
$ /opt/couchbase/bin/cbepctl host:port set flush_param exp_pager_stime 60;
setting param: exp_pager_stime 3600
set exp_pager_stime to 3600
$ /opt/couchbase/bin/cbstats host:port all | grep exp_pager_stime;
ep_exp_pager_stime: 36000
$ /opt/couchbase/bin/cbstats host:port config | grep exp_pager_stime;
ep_exp_pager_stime: 18000
I don’t see how my setting relates to the number reported by cbstats.
Can anyone explain what’s going on?