Big JVM heaps can be Big Trouble JVMs have never been good at dealing with large heaps. Large heaps mean lots of garbage collection work, and often means some pretty long stop-the-world GC pauses where nothing else can proceed. This can cause query/request timeouts, or even zookeeper session timeouts in SolrCloud mode. Off-Heap Filters Heliosearch/Solr has some pretty advanced filter caching , but it can take up a significant amount of memory, depending on the application. This is exactly the type of large,
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