![]() Once things can no longer fit into memory and you have to start swapping to disk is when you are going to see performance hits. Static bool SubstringPredicate(string item)Īfter all 10 million phases have been loaded into the list, it still only takes about a second for "var matches = index.FindAll(SubstringPredicate) " to return over 4 million hits. ![]() Var matches = index.FindAll(SubstringPredicate) Index.Add(RandomString(5) + " " + RandomString(5) + " " + RandomString(5)) > The patch passes all core tests > (.highlight. StringBuilder builder = new StringBuilder() I also had to cut over SpanQuery.getSpans(IR) to > SpanQuery.getSpans(AtomicReaderContext) which I should probably do on trunk > first but after that pain today I need a break first :). Once a document with multiple indexable fields are created, it can be added into the full text search index. A document contains multiple indexable fields. I would suspect that it has something to do with how the list of children is now handled. Apache Lucene library provides two object types, one is called a Document the other is called an IndexableField. Our core algorithms along with the Solr search server power applications the world over, ranging from mobile devices to sites like Twitter, Apple and Wikipedia. The query uses the searchable index to perform score & relevance based searches. insert - The insert producer builds a searchable index by analyzing the body in incoming exchanges and associating it with a token ('content').query - The query producer performs searches on a pre-created index. Lucene is the search core of both Apache Solr and Elasticsearch. Perform inserts or queries against Apache Lucene databases. So at some point, some change made the query parser 100 times slower. Apache Lucene set the standard for search and indexing performance. For Lucene 5.4.1, the timings settle down to 2000030000 with the fastest being 22444. Private static string RandomString(int size) For Lucene 3.6.2, the timings settle down to 200300 with the fastest being 207. Private static Random random = new Random((int)) //thanks to McAden My solution so far has been to comment out the indexWriter.addDocument(.) and mit(), and recreate the entire index every now and again by first. To illustrate further, here's some generic C# code that basically does a "** E*" type search of 10 million random 3 word phrases. I tried the same index on a box with only 1GB of memory, and it took about 20 seconds. TestOfflineSorter.java (lucene-9.1.0-src.tgz): TestOfflineSorter.java (lucene-9.2.0-src. On a box with 8GB, it returned 500K hits in under 5 seconds. )Īs an example, I fired up an old 2GB index, and searched for "*e". Depends on how much memory you have, and how much of the token index is in memory.Ī 360MB total index could be searched quite quickly on any old computer. Lucene discourages the use of a leading wildcard, as this requires traversing all the terms in the inverted index, which could be slow.
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