Ocean Realtime Search
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Key: LUCENE-1313
URL: https://issues.apache.org/jira/browse/LUCENE-1313
Project: Lucene - Java
Issue Type: New Feature
Components: contrib/*
Reporter: Jason Rutherglen
Provides realtime search using Lucene. Conceptually, updates are divided into
discrete transactions. The transaction is recorded to a transaction log which
is similar to the mysql bin log. Deletes from the transaction are made to the
existing indexes. Document additions are made to an in memory
InstantiatedIndex. The transaction is then complete. After each transaction
TransactionSystem.getSearcher() may be called which allows searching over the
index including the latest transaction.
TransactionSystem is the main class. Methods similar to IndexWriter are
provided for updating. getSearcher returns a Searcher class.
- getSearcher()
- addDocument(Document document)
- addDocument(Document document, Analyzer analyzer)
- updateDocument(Term term, Document document)
- updateDocument(Term term, Document document, Analyzer analyzer)
- deleteDocument(Term term)
- deleteDocument(Query query)
- commitTransaction(List<Document> documents, Analyzer analyzer, List<Term>
deleteByTerms, List<Query> deleteByQueries)
Sample code:
{code}
// setup
FSDirectoryMap directoryMap = new FSDirectoryMap(new File("/testocean"), "log");
LogDirectory logDirectory = directoryMap.getLogDirectory();
TransactionLog transactionLog = new TransactionLog(logDirectory);
TransactionSystem system = new TransactionSystem(transactionLog, new
SimpleAnalyzer(), directoryMap);
// transaction
Document d = new Document();
d.add(new Field("contents", "hello world", Field.Store.YES,
Field.Index.TOKENIZED));
system.addDocument(d);
// search
OceanSearcher searcher = system.getSearcher();
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
System.out.println(hits.length + " total results");
for (int i = 0; i < hits.length && i < 10; i++) {
Document d = searcher.doc(hits[i].doc);
System.out.println(i + " " + hits[i].score+ " " + d.get("contents");
}
{code}
There is a test class org.apache.lucene.ocean.TestSearch that was used for
basic testing.
A sample disk directory structure is as follows:
|/snapshot_105_00.xml | XML file containing which indexes and their generation
numbers correspond to a snapshot. Each transaction creates a new snapshot
file. In this file the 105 is the snapshotid, also known as the transactionid.
The 00 is the minor version of the snapshot corresponding to a merge. A merge
is a minor snapshot version because the data does not change, only the
underlying structure of the index|
|/3 | Directory containing an on disk Lucene index|
|/log | Directory containing log files|
|/log/log00000001.bin | Log file. As new log files are created the suffix
number is incremented|
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