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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1473) Implement standard Serialization across Lucene versions
Date Fri, 05 Dec 2008 22:45:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653955#action_12653955
] 

Jason Rutherglen commented on LUCENE-1473:
------------------------------------------

Doug wrote: We can save, in files, serialized instances of each query type from the oldest
release we intend to support. Then read each of thes queries and check that it s equal to
a current query that's meant to be equivalent (ssuming all queries implement equals well).
Something similar would need to be done for each class that is meant to be transmitted cross-version.

This tests that older queries may be processed by newer code. It does not test that newer
queries can be processed by older code. Documentation is a big part of this effort, that should
be completed first. What guarantees to we intend to provide? Once we've documented these,
then we can begin writing tests. For example, we may only guarantee that older queries work
with newer code, and that newer hits work with older code. To test that we'd need to have
an old jar around that we could test against. This will be a trickier test to configure.

--------------

Makes sense.  I guarantee 2.9 and above classes will be backward compatible with the previous
classes.  I think that for 3.0 we'll start to create new replacement classes that will not
conflict with the old classes.  I'd really like to redesign the query, similarity, and scoring
code to work with flexible indexing and allow new algorithms.  This new code will not create
changes in the existing query, similarity, and scoring code which will remain serialization
compatible with 2.9.  The 2.9 query, similarity, and scoring should leverage the new query,
similarity and scoring code to be backwards compatible.  


> 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, LUCENE-1473.patch, 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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