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https://issues.apache.org/jira/browse/LUCENE-550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karl Wettin updated LUCENE-550:
-------------------------------
Attachment: trunk.diff.bz2
Can now be loaded from, and be persisted in an FSDirectory.
The actual implementation is a bit more abtract than that though. It is not
super nice yet, but all low level index comparator tests pass.
Introduced functionallity to load an instantiated from any index reader (e.g. a
FSDirectory)
{code:java}
/**
* Creates a new instantiated index that looks just like the index in a
specific state as represented by a reader.
*
* @param sourceIndexReader the source index this new instantiated index will
be copied from.
* @throws IOException if the source index is not optimized, or when accesing
the source.
*/
public InstantiatedIndex(IndexReader sourceIndexReader) throws IOException {
{code}
Also introduced class SimpleSychronizedIndex, a class that kind of works like
unix command "tee", makes sure that all changes to a main index (e.g. an
instantiated index) also is applied to a mirror index (e.g. the fs directory
loaded to the instantiated index at constructor time).
Some class that handles these two things a single entity will probably be added
soon.
Basiacally this is replicating changes to a secondary index on commits. Thus it
takes about twice the time to insert documents. Perhaps the secondary index
should be updated in a secondary thread?
> InstantiatedIndex - faster but memory consuming index
> -----------------------------------------------------
>
> Key: LUCENE-550
> URL: https://issues.apache.org/jira/browse/LUCENE-550
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Affects Versions: 2.0.0
> Reporter: Karl Wettin
> Assigned To: Karl Wettin
> Attachments: lucene-550.jpg, test-reports.zip, trunk.diff.bz2,
> trunk.diff.bz2, trunk.diff.bz2
>
>
> An non file centrinc all in memory index. Consumes some 2x the memory of a
> RAMDirectory (in a term satured index) but is between 3x-60x faster depending
> on application and how one counts. Average query is about 8x faster.
> IndexWriter and IndexModifier have been realized in InterfaceIndexWriter and
> InterfaceIndexModifier.
> InstantiatedIndex is wrapped in a new top layer index facade (class Index)
> that comes with factory methods for writers, readers and searchers for unison
> index handeling. There are decorators with notification handling that can be
> used for automatically syncronizing searchers on updates, et.c.
> Index also comes with FS/RAMDirectory implementation.
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