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cassdir

Cassandra implementation of Lucene Directory.

By Thanh Ba Nguyen (btnguyen2k (at) gmail.com)

Project home: https://github.com/DDTH/cassdir

Features

• Store Lucene's index in Cassandra.
• Performance enhancement with caching support.
• Support fine-tuning Cassandra consistency level per operation (read/write file data, lock, remove file, etc).

Installation

Latest release version: 0.1.1. See RELEASE-NOTES.md.

Maven dependency:

<dependency>
	<groupId>com.github.ddth</groupId>
	<artifactId>cassdir</artifactId>
	<version>0.1.1</version>
</dependency>

Related projects/libs

• ddth-cache-adapter: for caching support.
• ddth-redis: to use Redis as cache backend.
• ddth-cql-utils: library to interact with Cassandra via CQL.
• Datastax Java Driver for Cassandra: Java driver to access Cassandra cluster.

Usage

Cassandra column family schema (as CQL): see dbschema/cassdir.cql.

Create a CassandraDirectory instance:

String cassHostsAndPorts = "localhost:9042,host2:port2,host3:port3";
CassandraDirectory DIR = new CassandraDirectory(cassHostsAndPorts, cassUser, cassPassword, cassKeySpace);
DIR.init();

Index documents with IndexWriter:

Analyzer analyzer = new StandardAnalyzer();
IndexWriterConfig iwc = new IndexWriterConfig(analyzer);
iwc.setOpenMode(OpenMode.CREATE_OR_APPEND);
IndexWriter iw = new IndexWriter(DIR, iwc);

// add/update documents
// ...

iw.commit();
iw.close();

Or, search documents with IndexSearcher:

IndexReader ir = DirectoryReader.open(DIR);
IndexSearcher is = new IndexSearcher(ir);

// search documents
// ...

ir.close();

Call CassandraDirectory.destroy() when done.

Examples: see src/test/java.

License

See LICENSE.txt for details. Copyright (c) 2015 Thanh Ba Nguyen.

Third party libraries are distributed under their own license(s).