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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1473) Implement standard Serialization across Lucene versions
Date Fri, 05 Dec 2008 17:30:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653869#action_12653869
] 

Doug Cutting commented on LUCENE-1473:
--------------------------------------

> How to write a unit test for multiple versions?

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.


> 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
>
>   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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