Hi, We have a solr cloud setup (tlog + pull - v8.2) which is currently showing a large amount of CPU being used by Lucene Merge Thread pool which are spawned by ConcurrentMergeScheduler. As a result of this, our writes have considerably slowed down.
We were looking to fine tune that config basis this doc: https://solr.apache.org/guide/8_2/indexconfig-in-solrconfig.html by mentioning something like below inside the solrconfig.xml <indexConfig> ... <mergeScheduler class="org.apache.lucene.index.ConcurrentMergeScheduler"> <int name="maxMergeCount">6</int> <int name="maxThreadCount">1</int> </mergeScheduler> </indexConfig> However, these configs are not getting honored (per the top output captured) either on: 1. uploading the configs on zookeeper and reloading 2. uploading the configs on zookeeper and reloading and restarting the boxes (we understand that these configs are only applicable for a leader") Could you please point out what is the SOP to follow when changing configs around: mergeScheduler, mergePolicyFactory or ramBufferSizeMB so that they come into effect? Also is there an API where the configs honored by the process are displayed? I couldn't find these being reported by /admin/metrics API
