lucene/solr/SYSTEM_REQUIREMENTS.txt

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# System Requirements
Apache Solr runs of Java 7 or greater. When using Java 7, be sure to
install at least Update 1! With all Java versions it is strongly
recommended to not use experimental `-XX` JVM options. It is also
recommended to always use the latest update version of your Java VM,
because bugs may affect Solr. An overview of known JVM bugs can be
found on http://wiki.apache.org/lucene-java/JavaBugs.
CPU, disk and memory requirements are based on the many choices made in
implementing Solr (document size, number of documents, and number of
hits retrieved to name a few). The benchmarks page has some information
related to performance on particular platforms.