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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703658#action_12703658
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Yonik Seeley commented on LUCENE-1618:
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As it relates to near real time, the search speed of the RAM directory in
relation to FSDirectory seems unimportant (what is this diff anyway?) - the
FSDirectory will be much larger and that is where the bulk of the search time
will be.
It seems like the main benefit of RAMDirectory for NRT is faster creation time
(no need to create on-disk files, write them, then sync them), right? Actually
the sync is only needed if a new segments file will be written... but there
still may be synchronous metadata operations for open-write-close of a file,
depending on the FS?
> 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
>
> Attachments: MemoryCachedDirectory.java
>
> 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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