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https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652878#action_12652878
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Jason Rutherglen commented on LUCENE-1473:
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> the performance improvement should be measured and demonstrated to be
> significant
The initial concern was the incompatibility of serialized objects between
Lucene versions. The performance improvements created by using Externalizable
are secondary and so providing tests would be a waste of time if the
"community" believes it is too much effort to add *1 line* of code to a handful
of classes. Implementing Externalizable is a way to reduce the size of the
serialized objects, manage the serialized object versions, and provide
performance improvements. Externalizable provides the most benefits and is
very similar to the system Hadoop uses with Writeable. Externalizable works
seamlessly with native object serialization and Serializable implemented
classes, meaning it works with a number of existing Java classes in addition to
Externalizable classes.
Using distributed serialized objects for search in Lucene is a natural Java
based way to run a Lucene system. In many cases it is ideal because Java
provides something C++ does not, dynamic in-process class loading. In a large
grid based search system that requires 100% uptime this feature can be
particularly useful.
Adding a serialVersionUID to the classes is one option, adding Externalizable
is another option.
If the decision is to not support Serialization in Lucene then I recommend
removing Serializable from all classes in Lucene 3.0 so that users do not
mistakenly expect the search library to behave the way other Java libraries
such as ICU4J, JDK class libraries, Spring, etc do.
> Implement Externalizable in main top level searcher classes
> -----------------------------------------------------------
>
> 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
>
>
> To maintain serialization compatibility between Lucene versions, major
> classes can implement Externalizable. This will make Serialization faster
> due to no reflection required and maintain backwards compatibility.
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