Dmitry Sterinzat created IGNITE-12094:
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Summary: Scan Query scheduled to be executed on wrong node
Key: IGNITE-12094
URL: https://issues.apache.org/jira/browse/IGNITE-12094
Project: Ignite
Issue Type: Bug
Components: cache
Affects Versions: 2.7.5
Reporter: Dmitry Sterinzat
When Scan query on Replicated cache executes from client node and topology is
unstable (for example 2 new server nodes are up at the same time) it is
possible to get empty result:
{code:java}
// IgniteCacheProxyImpl#projection
// here we return cluster group with random cluster node
return
ctx.kernalContext().grid().cluster().forDataNodes(ctx.name()).forRandom();{code}
{code:java}
// GridCacheQueryAdapter#executeScanQuery
// Affinity nodes snapshot.
Collection<ClusterNode> nodes = new ArrayList<>(nodes());
...
if (nodes.isEmpty()) {
if (part != null && forceLocal)
throw new IgniteCheckedException("No queryable nodes for partition " +
part
+ " [forced local query=" + this + "]");
return new GridEmptyCloseableIterator();
}
// GridCacheQueryAdapter#nodes(final GridCacheContext<?, ?> cctx,
@Nullable final ClusterGroup prj, @Nullable final Integer part)
final AffinityTopologyVersion topVer =
cctx.affinity().affinityTopologyVersion();
// This collection isn't contains randomly selected node because
AffinityTopologyVersion is previous.
Collection<ClusterNode> affNodes = CU.affinityNodes(cctx, topVer);
...
return F.view(affNodes, new P1<ClusterNode>() {
@Override public boolean apply(ClusterNode n) {
return cctx.discovery().cacheAffinityNode(n, cctx.name()) &&
(prj == null || prj.node(n.id()) != null) &&
(part == null || owners.contains(n));
}
});
}
{code}
In our case nodes collection is empty, because node that was randomly selected
isn't current topology version (cache isn't already started), so we get
GridEmptyCloseableIterator (query event isn't executed).
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