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https://issues.apache.org/jira/browse/LUCENE-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891659#action_12891659
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Michael McCandless commented on LUCENE-2555:
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{quote}
bq. What are the performance implications of removing shared doc stores?
I agree we have to test this when this patch is complete. My hope is that we
save in other places (removing the interleaving step of the per-thread
postings, no wait queue that serializes writing to doc stores) so that overall
we won't be slower.
{quote}
Also, remember that shared doc stores is not as good an opto as it used to be,
because we are now able to bulk-copy both stored fields and term vectors during
merging.
However, bulk merging only happens if the field name -> number mapping is
congruent, b/w the merged segment and the one segment being merged.
Unfortunately, you can easily unexpectedly break this (see LUCENE-1737) but eg
adding diff't fields to your docs, or adding same fields just in a different
order.
> Remove shared doc stores
> ------------------------
>
> Key: LUCENE-2555
> URL: https://issues.apache.org/jira/browse/LUCENE-2555
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael Busch
> Assignee: Michael Busch
> Priority: Minor
> Fix For: Realtime Branch
>
>
> With per-thread DocumentsWriters sharing doc stores across segments doesn't
> make much sense anymore.
> See also LUCENE-2324.
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