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https://issues.apache.org/jira/browse/IGNITE-12549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047890#comment-17047890
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Sergey Kosarev commented on IGNITE-12549:
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[~Pavlukhin], please look. no blockers here, do you give final approve?
> Scan query/iterator on a replicated cache may get wrong results
> ---------------------------------------------------------------
>
> Key: IGNITE-12549
> URL: https://issues.apache.org/jira/browse/IGNITE-12549
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Affects Versions: 2.7.6
> Reporter: Sergey Kosarev
> Assignee: Sergey Kosarev
> Priority: Critical
> Fix For: 2.9, 2.8.1
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> Case 1
> 1. start server node 1
> 2. create and fill replicated cache with RebalanceMode.Async (as by default)
> 3. start servr node 2
> 4. immediately execute scan query on the replicated cache((or just iterate
> the cache)) on the node 2
> It can get empty or partial results. (if rebalance on node 2 is finished)
> Case 2
> 1. start server node 1
> 2. create and fill replicated cache with RebalanceMode.Async (as by default)
> 3. start client node 2
> 4. start server node 3
> 5. immediately execute scan query on the replicated cache((or just iterate
> the cache)) on the client node 2
> It can get empty or partial results. (if rebalance on node 2 is not finished
> and query is mapped on the node 2)
> It looks like problem in the
> org.apache.ignite.internal.processors.cache.query.GridCacheQueryAdapter#nodes()
> case REPLICATED:
> if (prj != null || part != null)
> return nodes(cctx, prj, part);
> if (cctx.affinityNode())
> return *Collections.singletonList(cctx.localNode())*;
> Collection<ClusterNode> affNodes = nodes(cctx, null, null);
> return affNodes.isEmpty() ? affNodes :
> *Collections.singletonList(F.rand(affNodes))*;
> case PARTITIONED:
> return nodes(cctx, prj, part);
> which is executed in
> org.apache.ignite.internal.processors.cache.query.GridCacheQueryAdapter#executeScanQuery.
> If executed on a just started node it obviously returns the local node
> disregarding was it rebalanced or not.
> If executed on a client it returns a random affinity node, so it also can be
> not yet rebalanced node.
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