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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1313) Ocean Realtime Search
Date Wed, 03 Sep 2008 18:43:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628092#action_12628092
] 

Jason Rutherglen commented on LUCENE-1313:
------------------------------------------

Is there a good place to place the javadocs on the Apache website once they are more complete?
 

> 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, 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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