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https://issues.apache.org/jira/browse/LUCENE-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891558#action_12891558
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Shai Erera commented on LUCENE-2555:
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What are the performance implications of removing shared doc stores? From what
I understand, if several segments share the same doc store, then when they are
merged, the doc stores aren't merged. Which is a great benefit, especially if
you intend to store large fields.
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?
> 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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