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From Apache Wiki <>
Subject [Lucene-java Wiki] Update of "ReleaseNote40alpha" by MikeMcCandless
Date Thu, 28 Jun 2012 18:36:19 GMT
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The "ReleaseNote40alpha" page has been changed by MikeMcCandless:

     also sometimes avoid going to disk at all for terms that do not exist. Alternative term
     dictionary implementions are provided and pluggable via the Codec api.
+  * Substantially faster performance when using a Filter during searching.
+  * File-system based directories can rate-limit the IO (MB/sec) of merge
+    threads, to reduce IO contention between merging and searching threads.
   * Added a number of alternative Codecs and components for different use-cases: "Appending"
     works with append-only filesystems (such as Hadoop DFS), "Memory" writes the entire 
     terms+postings as an FST read into RAM (see
@@ -60, +65 @@

     finite-state automaton (see
   * FuzzyQuery is 100-200 times faster than in past releases (see
a new
+  * A new spell checker, DirectSpellChecker, finds possible corrections directly against
+    main search index without requiring a separate index.
   * Various in-memory data structures such as the term dictionary and FieldCache are represented
     more efficiently with less object overhead.

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