Hi Dmitry, There is a test for WeightedRandomLoadBalancingSpi [1]. It passes on master. Which version of Ignite do you use? Could you share a reproducer of the issue so I can have a look? [1] https://github.com/apache/ignite/blob/master/modules/core/src/test/java/org/apache/ignite/spi/loadbalancing/weightedrandom/GridWeightedRandomLoadBalancingSpiWeightedSelfTest.java
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