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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3529) Add search to HBase
Date Mon, 14 Feb 2011 17:15:57 GMT
Add search to HBase

                 Key: HBASE-3529
                 URL: https://issues.apache.org/jira/browse/HBASE-3529
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 0.90.0
            Reporter: Jason Rutherglen

Using the Apache Lucene library we can add freetext search to HBase.  The advantages of this

* HBase is highly scalable and distributed
* HBase is realtime
* Lucene is a fast inverted index and will soon be realtime (see LUCENE-2312)
* Lucene offers many types of queries not currently available in HBase (eg, AND, OR, NOT,
phrase, etc)
* It's easier to build scalable realtime systems on top of already architecturally sound,
scalable realtime data system, eg, HBase.
* Scaling realtime search will be as simple as scaling HBase.

Phase 1 - Indexing:

* Integrate Lucene into HBase such that an index mirrors a given region.  This means cascading
add, update, and deletes between a Lucene index and an HBase region (and vice versa).
* Define meta-data to mark a region as indexed, and use a Solr schema to allow the user to
define the fields and analyzers.
* Integrate with the HLog to ensure that index recovery can occur properly (eg, on region
server failure)
* Mirror region splits with indexes (use Lucene's IndexSplitter?)
* When a region is written to HDFS, also write the corresponding Lucene index to HDFS.
* A row key will be the ID of a given Lucene document.  The Lucene docstore will explicitly
not be used because the document/row data is stored in HBase.  We will need to solve what
the best data structure for efficiently mapping a docid -> row key is.  It could be a docstore,
field cache, column stride fields, or some other mechanism.
* Write unit tests for the above

Phase 2 - Queries:

* Enable distributed Lucene queries
* Regions that have Lucene indexes are inherently available and may be searched on, meaning
there's no need for a separate search related system in Zookeeper.
* Integrate search with HBase's RPC mechanism

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