Simon Willnauer created LUCENE-4071:
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Summary: 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
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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