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Posted to dev@lucene.apache.org by "Mark Harwood (JIRA)" <ji...@apache.org> on 2008/12/04 00:43:44 UTC
[jira] Commented: (LUCENE-1473) Implement standard Serialization
across Lucene versions
[ https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653057#action_12653057 ]
Mark Harwood commented on LUCENE-1473:
--------------------------------------
The contrib section of Lucene contains an XML-based query parser which aims to provide full-coverage of Lucene queries/filters and provide extensibility to support 3rd party classes.
I use this regularly in distributed deployments and this allows both non-Java clients and long-term persistence of queries with good stability across Lucene versions.
Although I have not conducted formal benchmarks I have not been drawn to XML parsing as a bottleneck - search execution and/or document retrieves are normally the main bottlenecks.
Maintaining XML parsing code is an overhead but ultimately helps decouple requests from the logic that executes requests. In serializing Lucene Query/Filter objects we are dealing with the classes which combine both the representation of the request criteria (what needs to be done) and the implementation (how things are done). We are forever finessing the "how" bit of this equation e.g. moving from RangeQuery to RangeFilters to TrieRangeFilter. The criteria however remains relatively static (" I just want to search on a range") and so it is dangerous to build clients that refer tdirectly to query implementation classes.
The XML parser provides a language-independent abstraction for clients to define what they want to be done without being too tied to how this is implemented.
Cheers
Mark
> Implement standard Serialization across Lucene versions
> -------------------------------------------------------
>
> Key: LUCENE-1473
> URL: https://issues.apache.org/jira/browse/LUCENE-1473
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.4
> Reporter: Jason Rutherglen
> Priority: Minor
> Attachments: LUCENE-1473.patch
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> To maintain serialization compatibility between Lucene versions, serialVersionUID needs to be added to classes that implement java.io.Serializable. java.io.Externalizable may be implemented in classes for faster performance.
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