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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703850#action_12703850
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Jason Rutherglen commented on LUCENE-1618:
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{quote}For an NRT writer using RAMDir for recently flushed tiny
segments (LUCENE-1313), the gains are more about the speed of
reading/writing many tiny files. Probably we should try
[somehow] to test this case, to see if LUCENE-1313 is even a
worthwhile optimization.{quote}
True a test would be good, how many files per second would it
produce?
When testing the realtime and the .del files (which are created
numerously before LUCENE-1516) the slowdown was quite dramatic
as it's not a sequential write which means the disk head can
move each time. That coupled with merges going on which
completely ties up the IO I think it's hard for small file
writes to not slow down with a rapidly updating index.
An index that is being updated rapidly presumably would be
performing merges more often to remove deletes.
> 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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