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https://issues.apache.org/jira/browse/LUCENE-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724085#action_12724085
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Michael McCandless commented on LUCENE-1717:
--------------------------------------------

bq. is there already an issue to fix the RAM usage?

This is the issue.

I think even if our measure is not perfect we should try to take a stab at 
accounting for RAM usage of deletes; it's a trap, now.  We shouldn't set traps.

> IndexWriter does not properly account for the RAM consumed by pending deletes
> -----------------------------------------------------------------------------
>
>                 Key: LUCENE-1717
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1717
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.4, 2.4.1
>            Reporter: Michael McCandless
>             Fix For: 2.9
>
>         Attachments: BufferedDeletes_beautification.patch
>
>
> IndexWriter, with autoCommit false, is able to carry buffered deletes for 
> quite some time before materializing them to docIDs (thus freeing up RAM 
> used).
> It's only on triggering a merge (or, commit/close) that the deletes are 
> materialized and the RAM is freed.
> I expect this in practice is a smallish amount of RAM, but we should still 
> fix it.
> I don't have a patch yet so if someone wants to grab this, feel free!!

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