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https://issues.apache.org/jira/browse/IGNITE-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15878214#comment-15878214
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Ivan Veselovsky commented on IGNITE-4720:
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Actual reason of failure is that field
org.apache.hadoop.mapreduce.lib.aggregate.ValueAggregatorJobBase#aggregatorDescriptorList
holding the ValueAggregatorDescriptor-s is *static*, so when using
ignite.job.shared.classloader=true , this field is used in several Map tasks ,
creating data race.
> Sporadically fails for Hadoop
> -----------------------------
>
> Key: IGNITE-4720
> URL: https://issues.apache.org/jira/browse/IGNITE-4720
> Project: Ignite
> Issue Type: Bug
> Components: hadoop
> Affects Versions: 1.8
> Reporter: Irina Zaporozhtseva
> Assignee: Ivan Veselovsky
> Fix For: 1.9
>
>
> hadoop example aggregatewordcount under apache ignite hadoop edition grid
> with 4 nodes for hadoop-2_6_4 and hadoop-2_7_2:
> aggregatewordcount returns 999712 instead of 1000000
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