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https://issues.apache.org/jira/browse/LUCENE-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891655#action_12891655
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Michael Busch commented on LUCENE-2555:
---------------------------------------
{quote}
I understand (mostly from the discussion on the PTDW) that with the move to a
per-thread approach, the doc stores cannot be shared between segments created
by different threads, but what about segments created by the same thread? Are
we losing that functionality?
{quote}
We discussed that in LUCENE-2324 (close to the bottom). The problem is that
doc stores only help you if you merge segments that all share the same store.
With DWPT that's extremely unlikely.
{quote}
What are the performance implications of removing shared doc stores?
{quote}
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.
> 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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