Lucene in Action

....lucene.mergeFactor 10 Controls segment merge frequency and size continued on next page Table ... before writing them to the disk, as well as how often to merge multiple index segments together. (Index ... that once the number of segments on the disk has reached the power of 10, Lucene merges these segments ... 10 are merged into a single segment of size 100. When 10 such seg- ments of size 100 have been added, they're merged into a single segment contain- ing 1,000 Documents, and so on. Therefore, at any time...

...Index optimization is the process that merges multiple index files together in order to reduce ... before combining them into a segment that it writes onto a disk, optionally merging this new segment with previously created segments. Although you can control the segment-merg- ing process ... search performance. Index optimization merges all index segments into a single segment. You can ... an index, Lucene merges exist- ing segments by creating a brand-new segment whose content in the end...

...; if you catch Lucene while it's merging segments, you'll notice the commit.lock file, too. You can ... from misuse of its API, Lucene creates file-based locks around all code segments that need ... is used whenever segments are being read or merged. It's obtained by an IndexReader before it reads the segments file, which names all index segments, and it's released only after IndexReader has opened ... it creates a new segments file and keeps it until it removes the index files that have been made obsolete...

... of index segments and a small subset of index files when segments are merged. On the other hand, IndexReader knows how to parse all index files and make sense out of them. When a Document is deleted ... internally when index segments are merged. Hence, you shouldn't assume that a given Document ... the Index- Reader and force Lucene to merge index segments by optimizing the index. When we subsequently open ... and merge, Lucene renumbered the remain- ing Documents. Only one Document remains in the index, so the next...

... to instruct Lucene to merge segments on disk less frequently, FSDirectory-based indexing has to write them ... when you use FSDirectory, a file- based Directory implementation. But perhaps you want to have more ... .io.tmpdir", "tmp") + System.getProperty("file.separator") + "fs-index"; Create Directory whose ramDir = new ... ) { fsWriter.addIndexes(Directory[] {ramDir}); Merge in-memory RAMDirectory ramWriter.close ... (Directory[]) method to merge your RAMDirectory-based index with the one on disk. This method takes...

... index consists of one or more segments, and each segment is made up of several index files. Index files ... example index, the index con- sisted of a single segment whose files started with _lfyc: The following ... to the index by adding them to newly created index segments and only periodically merging them with other ... parameters, all 34 of its documents would be merged in a single segment. Figure B.2 Unoptimized ... of segments, and hence index files, varies while indexing is in progress. Once an index is fully built...

... 27 Fragmenter 300 converting native files to DNA 354 FrenchAnalyzer 282 ASCII 142 Docco 265 fuzzy string ... ing 177 file handle customizing 350 open-ended ranges 172 issue 340 priority-queue idea ... . See Nutch merging indexes 52 session 77 Microsoft Word documents Jakarta Commons Digester HTTP ... structure 395 Japanese analysis 142 I numbers 40-41 Java Messaging Service 352 open files 47-48 in XM- I ... 402 scheduling 367 JDOM 264 IndexFiles 389 segments 396-397 jGuru 341 IndexHTML 390 status with LIMO...