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https://issues.apache.org/jira/browse/LUCENE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13280323#comment-13280323
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Uwe Schindler commented on LUCENE-4071:
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Thanks to SDDS-Jenkins :-)
> DWStallControl can deadlock IW if no flushes are running / pending
> ------------------------------------------------------------------
>
> Key: LUCENE-4071
> URL: https://issues.apache.org/jira/browse/LUCENE-4071
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Critical
> Fix For: 4.0
>
> Attachments: LUCENE-4071.patch
>
>
> DWStallControl currently only checks if the net bytes used by all the DWPT
> and deletes exceeds the stall limit (2*MAX_RAM_BUFFER). This is generally a
> very good default but in certain situations we can exceed this limit even
> without an ongoing flush. Stalling is used to prevent IW overloading due to
> slow flushes etc. which should not happen too often in practice. With a
> smallish RAM Buffer and a bigger document we can easily get into the stage
> where we stall the DW without a chance to free up the memory.
> I think we should make sure that a pending or running flush can free up
> enough memory to unstall.
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