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https://issues.apache.org/jira/browse/LUCENE-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724032#action_12724032
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Simon Willnauer commented on LUCENE-1717:
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bq. But we default that to unlimited (meaning, flush when RAM limit is hit),
which I think is a good default once we fix the accounting in IndexWriter to
properly account for buffered delete's RAM usage.
I agree we should track the ram usage of BufferedDeletes too.
One other thing I wonder about is why deletesInRam is only cleared on abort.
Once IndexWriter#doFlushInternal is executed the DocWriter pushes deletes from
deletesInRam to deletesFlushed. Shouldn't this call deletesInRam#clear() to
free the memory in this instance of BufferedDeletes. That could at least help a
bit if I do not miss anything important.
> 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
>
>
> 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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