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https://issues.apache.org/jira/browse/LUCENE-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728853#action_12728853
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Michael McCandless commented on LUCENE-1726:
--------------------------------------------
I don't have any particular tools...
First I simplify the test as much as possible while still hitting the
failure (eg this failure happens w/ only 2 threads), then see if the
error will happen if I turn on IndexWriter's infoStream (it doesn't
for this, so far). If so, I scrutinize the series of events to find
the hazard; else, I turn off infoStream and add back in a small number
of prints, as long as failure still happens.
Often I use a simple Python script that runs the test over & over
until a failure happens, saving the log, and then scrutinize that.
It's good to start with a rough guess, eg this failure is w/ only doc
stores so it seems likely the merging logic that opens doc stores just
before kicking off the merge may be to blame.
> IndexWriter.readerPool create new segmentReader outside of sync block
> ---------------------------------------------------------------------
>
> Key: LUCENE-1726
> URL: https://issues.apache.org/jira/browse/LUCENE-1726
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4.1
> Reporter: Jason Rutherglen
> Assignee: Michael McCandless
> Priority: Trivial
> Fix For: 3.1
>
> Attachments: LUCENE-1726.patch, LUCENE-1726.patch, LUCENE-1726.patch,
> LUCENE-1726.patch, LUCENE-1726.trunk.test.patch
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> I think we will want to do something like what field cache does
> with CreationPlaceholder for IndexWriter.readerPool. Otherwise
> we have the (I think somewhat problematic) issue of all other
> readerPool.get* methods waiting for an SR to warm.
> It would be good to implement this for 2.9.
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