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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703630#action_12703630
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Tim Smith commented on LUCENE-1618:
-----------------------------------
{quote}
You mean an opened IndexOutput would write its output to two (or more)
different places? So you could "write through" a RAMDir down to an FSDir? (This
way both the RAMDir and FSDir have a copy of the index).
{quote}
yes, so if you register more than one directory for "index files", then the
IndexOutput for the directory would dispatch to an IndexOutput for both sub
directories
then, the IndexInput would only be opened on the "primary" directory (for
instance, the RAM directory)
This will allow extremely fast searches, with the persistence of a backing
FSDirectory
coupled with then having a set of directories for the "Stored Documents", then
allows:
* RAM directory search speed
* All changes persisted to disk
* Documents Stored (and retrieved from disk) (or optionally retrieved from RAM)
> Allow setting the IndexWriter docstore to be a different directory
> ------------------------------------------------------------------
>
> Key: LUCENE-1618
> URL: https://issues.apache.org/jira/browse/LUCENE-1618
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4.1
> Reporter: Jason Rutherglen
> Priority: Minor
> Fix For: 2.9
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> Add an IndexWriter.setDocStoreDirectory method that allows doc
> stores to be placed in a different directory than the IW default
> dir.
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