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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Rutherglen updated LUCENE-1313:
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Attachment: lucene-1313.patch
lucene-1313.patch
Removed http://reader.imagero.com/uio/ code as it routinely corrupted the log.
It's replacement is RandomAccessFile. Added MultiThreadSearcherPolicy that is
used to created a multi threaded Searcher. Transaction multithreading has been
removed because it makes it hard to debug. It will be optional in the future.
Many bugs have been fixed. TestSearch tests for deletes. Index directories
are now of the form "2_index", the index id and the suffix "_index".
> Ocean Realtime Search
> ---------------------
>
> Key: LUCENE-1313
> URL: https://issues.apache.org/jira/browse/LUCENE-1313
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/*
> Reporter: Jason Rutherglen
> Attachments: lucene-1313.patch, lucene-1313.patch
>
>
> 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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