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https://issues.apache.org/jira/browse/LUCENE-7752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051061#comment-16051061
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Daniel Jelinski commented on LUCENE-7752:
-----------------------------------------
Okay, I think I got to the bottom of this.
The FlattenGraphFilter is a bit lazy when it comes to freeing visited graph
nodes. When it's done processing nodes 1,3,5, it frees nodes <1 (=0). When it's
done processing nodes 2,4,6 it frees nodes <2 (=1). In order to process node 7
it loads the entire graph up to node 14, pushing the number of concurrently
buffered nodes up to 13, which triggers test failure.
I modified the code to free nodes eagerly, so that releasing unneeded nodes
happens before processing, not after. This made the beast happy. Anyway, this
problem probably deserves a separate bug.
> Findbugs: Array.equals is equivalent to comparing references
> ------------------------------------------------------------
>
> Key: LUCENE-7752
> URL: https://issues.apache.org/jira/browse/LUCENE-7752
> Project: Lucene - Core
> Issue Type: Sub-task
> Reporter: Daniel Jelinski
> Priority: Minor
> Attachments: failing_graph.png, LUCENE-7752.patch
>
>
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