On Sun, Feb 11, 2018 at 8:47 AM, ~$alpha` <lavesh.ra...@gmail.com> wrote: > I have upgraded Solr4.0 Beta to Solr6.6. The Cache results look Awesome but > overall the CPU load on solr6.6 is double the load on solr4.0 and hence I am > not able to roll solr6.6 to 100% of my traffic. > > *Some Key Stats In Performance of Sol6 Vs Solr4* > Document cache usage increased from .98 from .14 > Query Result cache usage increased from .10 from .24 > Filter cache same as .94 > Field Value cache was 0.99 in solr4 but n/a in solr6 (i guess because field > multivalued concept was changed from solr4 to solr6)
It could be faceting... "uif" was the default faceting method in Solr 4 (which used fieldValueCache), which was good for facet performance but bad for heap usage and index turnaround time (NRT). It was removed, but then later re-added in the JSON Facet API. Access to that was hooked into the older facet API via facet.method=uif https://issues.apache.org/jira/browse/SOLR-8466 -Yonik
