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https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653057#action_12653057
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Mark Harwood commented on LUCENE-1473:
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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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