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https://issues.apache.org/jira/browse/IGNITE-8892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16550678#comment-16550678
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Stanilovsky Evgeny commented on IGNITE-8892:
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i append additional test, and collect jfr from master and this branch test run.
> Iterating over large dataset via ScanQuery can fails with OOME.
> ---------------------------------------------------------------
>
> Key: IGNITE-8892
> URL: https://issues.apache.org/jira/browse/IGNITE-8892
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Reporter: Andrew Mashenkov
> Assignee: Andrew Mashenkov
> Priority: Critical
> Labels: OutOfMemoryError
> Fix For: 2.7
>
> Attachments: ScanQueryOOM.java, list-8892.jfr, list-master.jfr
>
>
> Seems, iterating over query iterator (ScanQuery at least, but may be other
> affected as well) on client node cause memory leakage.
> The use case is quite simple.
> Start server and client. Put much data into cache, then iterate over all
> entries via ScanQuery.
> Looks like JVM crashed due to OOM as GridCacheDistributedQueryFuture.allCol
> map contains to many entries.
> I've put 15kk entries into cache and client failed with OOM after iterating
> over 10kk entry.
> In heapdump I observer 10kk GridCacheDistributedQueryFuture entries.
> We have to check if collection cleared correctly and it is really need to
> collect all entries.
> PFA repro.
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