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> Building a search engine index is not something Java is at all suitable for Worth pointing out that Lucene/Solr, the biggest open source player, is also Java

• marginalia_nu 5y ago
  This is some of the nonsense you are dealing with implementing a search index in Java: * You can only allocate on-heap arrays of 2 billion items. * On-heap arrays have a massive size overhead in terms of GC book-keeping. * You can only allocate off-heap memory map 2 Gb at a time. * This also goes for memory mapped areas. * You have no control over the lifecycle of mapped memory and off-heap memory. They get cleared if and when the GC feels like it. * You have no madvise capabilities * The language barely acknowledges unsigned types