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https://issues.apache.org/jira/browse/IGNITE-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15132716#comment-15132716
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Artem Shutak commented on IGNITE-2554:
--------------------------------------
Investigation results.
Possible fixes:
# A simple fix. We can always set {{nodesCnt}} to 1 at {{mapKeysToNodes}} for
local cache. It should fix the issue.
# Ignite does not store an affinity assignment history for local cache and
always operate with {{AffinityTopologyVersion(1)}}. At the test above, an
information about dynamically started "myCache" is available only for
{{AffinityTopologyVersion(1, 1)}}, but Ignite does not store it. A good fix for
the issue (and Ignite) is:
#* There is no need to store all history for local cache. So, we need just
update the head topology version (see GridAffinityAssignmentCache.head field)
#* We must return right topology version at all project. See, for example,
{{GridCacheAffinityManager}} and the following code
{code}
if (cctx.isLocal())
topVer = new AffinityTopologyVersion(1);
{code}
> Affinity.mapKeyToNode() method throw "ArithmeticException: / by zero" for
> LOCAL dinamically started cache
> ---------------------------------------------------------------------------------------------------------
>
> Key: IGNITE-2554
> URL: https://issues.apache.org/jira/browse/IGNITE-2554
> Project: Ignite
> Issue Type: Bug
> Reporter: Artem Shutak
> Priority: Minor
>
> Affinity.mapKeyToNode() method throw "ArithmeticException: / by zero" for
> LOCAL cache.
> The following code
> {code}
> public static void main(String[] args) {
> try (Ignite ignite = Ignition.start(new IgniteConfiguration())) {
> CacheConfiguration cc = new CacheConfiguration();
> cc.setCacheMode(LOCAL);
> cc.setName("myCache");
> ignite.getOrCreateCache(cc);
> ignite.affinity("myCache").mapKeyToNode("myKey");
> }
> }
> {code}
> Produce the following exception.
> {noformat}
> Exception in thread "main" java.lang.ArithmeticException: / by zero
> at
> org.apache.ignite.internal.processors.cache.affinity.GridCacheAffinityImpl.mapKeysToNodes(GridCacheAffinityImpl.java:210)
> at
> org.apache.ignite.internal.processors.cache.affinity.GridCacheAffinityImpl.mapKeyToNode(GridCacheAffinityImpl.java:187)
> at main
> {noformat}
> The issue is {{cctx.discovery().cacheAffinityNodes(cctx.name(), topVer)}}
> returns empty nodes collection.
> If cache started on node start then there is no exception.
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