1e8e4245dSRobert Muir<!-- 2e8e4245dSRobert Muir Licensed to the Apache Software Foundation (ASF) under one or more 3e8e4245dSRobert Muir contributor license agreements. See the NOTICE file distributed with 4e8e4245dSRobert Muir this work for additional information regarding copyright ownership. 5e8e4245dSRobert Muir The ASF licenses this file to You under the Apache License, Version 2.0 6e8e4245dSRobert Muir (the "License"); you may not use this file except in compliance with 7e8e4245dSRobert Muir the License. You may obtain a copy of the License at 8e8e4245dSRobert Muir 9e8e4245dSRobert Muir http://www.apache.org/licenses/LICENSE-2.0 10e8e4245dSRobert Muir 11e8e4245dSRobert Muir Unless required by applicable law or agreed to in writing, software 12e8e4245dSRobert Muir distributed under the License is distributed on an "AS IS" BASIS, 13e8e4245dSRobert Muir WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14e8e4245dSRobert Muir See the License for the specific language governing permissions and 15e8e4245dSRobert Muir limitations under the License. 16e8e4245dSRobert Muir--> 17e8e4245dSRobert Muir<html> 18e8e4245dSRobert Muir <head> 19e8e4245dSRobert Muir <title> 20e8e4245dSRobert Muir miscellaneous 21e8e4245dSRobert Muir </title> 22e8e4245dSRobert Muir </head> 23e8e4245dSRobert Muir <body> 24e8e4245dSRobert Muir 25f41eabdcSRobert Muir<h1>Misc Tools</h1> 26e8e4245dSRobert Muir 27e8e4245dSRobert MuirThe misc package has various tools for splitting/merging indices, 28e8e4245dSRobert Muirchanging norms, finding high freq terms, and others. 29e8e4245dSRobert Muir 30*a7747b63Szacharymorn<a id="DirectIODirectory"></a> 31*a7747b63Szacharymorn<h2>DirectIODirectory</h2> 32e8e4245dSRobert Muir 33e8e4245dSRobert Muir<p> 34*a7747b63Szacharymorn{@link org.apache.lucene.misc.store.DirectIODirectory} is a Directory implementation that bypasses the 35e8e4245dSRobert MuirOS's buffer cache (using direct IO) for any IndexInput and IndexOutput 36e8e4245dSRobert Muirused during merging of segments larger than a specified size (default 37e8e4245dSRobert Muir10 MB). This avoids evicting hot pages that are still in-use for 38e8e4245dSRobert Muirsearching, keeping search more responsive while large merges run. 39e8e4245dSRobert Muir 40e8e4245dSRobert Muir<p> 41ebc87a8aSzacharymornSee <a target="_top" href="http://blog.mikemccandless.com/2010/06/lucene-and-fadvisemadvise.html">this blog post</a> 42e8e4245dSRobert Muirfor details. 43e8e4245dSRobert Muir 44e8e4245dSRobert Muir</body> 45e8e4245dSRobert Muir 46e8e4245dSRobert Muir</html> 47