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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-550) InstantiatedIndex - faster but memory consuming index
Date Tue, 13 Mar 2007 05:17:09 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480274
] 

Doron Cohen commented on LUCENE-550:
------------------------------------

That's a good point about the task-benchmark karl! 

All 4 ReaderTasks are reusing the reader if it is already open, but if it is not already open,
each task opens a private one, and closes it after the task is done. 

I now see that the javadocs can be improved here - especially in the reader sub-tasks. I will
update the documentation to clarify this point. 

Anyhow, for the running tasks to share a reader, the alg part of the .alg file should have
something like this:

  OpenReader

  ReaderTaskA
  ReaderTaskB
  ReaderYaskC

  CloseReader

This way all three tasks would share the same, already open, reader.


> 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, trunk.diff.bz2, trunk.diff.bz2, trunk.diff.bz2, trunk.diff.bz2, trunk.diff.bz2,
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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