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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2555) Remove shared doc stores
Date Fri, 23 Jul 2010 16:18:50 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891655#action_12891655
] 

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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