Why are you using LogByteSIzeMergePolicy? The current default is TieredMergePolicy, unless you have a specific reason, I’d just take explicit merge policies out of your solrconfig and use the defaults.
That aside, I doubt it’s related. You could well see these spikes due to background merging, but that should have been present before as well. Every 3-5 seconds is interesting, does that coincide with commits and/or opening searchers? If opening searchers, quite possibly autowarming if you have that configured. > On Dec 11, 2019, at 9:26 AM, Danilo Tomasoni <tomas...@cosbi.eu> wrote: > > I'm sorry I forgot the pictures. > > On 11/12/19 15:20, Danilo Tomasoni wrote: >> Hello all, >> >> we have a solr instance with around 41MLN documents. >> >> Recently we stopped our forcemerge policy that ensured only 1 segment was >> present at query time, because we read here in the ML and elsewhere that >> this is considered bad practice and it's also very time consuming. >> >> So we implemented >> >> <mergePolicyFactory class="org.apache.lucene.index.LogByteSizeMergePolicy"> >> <int name="mergeFactor">10</int> >> </mergePolicyFactory> >> >> I don't know if this is related to our problem, but recently we noticed >> spikes in CPU usage (without iowait, and that's the strange thing, because >> otherwise I would have thought about an automatic merge) >> >> every 3-5 seconds. >> >> I attach a picture of the metrics collected from the system hosting solr >> that show this behaviour, as well as the gc log. >> >> Any idea why this can happen? >> >> Thank you >> >> Danilo >> > -- > Danilo Tomasoni > > Fondazione The Microsoft Research - University of Trento Centre for > Computational and Systems Biology (COSBI) > Piazza Manifattura 1, 38068 Rovereto (TN), Italy > tomas...@cosbi.eu > http://www.cosbi.eu > As for the European General Data Protection Regulation 2016/679 on the > protection of natural persons with regard to the processing of personal data, > we inform you that all the data we possess are object of treatment in the > respect of the normative provided for by the cited GDPR. > It is your right to be informed on which of your data are used and how; you > may ask for their correction, cancellation or you may oppose to their use by > written request sent by recorded delivery to The Microsoft Research – > University of Trento Centre for Computational and Systems Biology Scarl, > Piazza Manifattura 1, 38068 Rovereto (TN), Italy. > P Please don't print this e-mail unless you really need to >
