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Cache batch insert/update

DataStreamer approach

Using DataStreamer approach for preloading cache entries during the rebalance procedure The most suitable case of using DataStreamer for the cluster rebalancing is the case when the user sets the rebalanceThreadPoolSize greater than one thread. Note, that using the DataStreamer approach may lead to the higher system resources degradation as well. In  In some of the cases it can be acceptable (e.g. user donates some system resources to the rebalance procedure to reduce the time of cluster balancing). One of the advantages of this approach is that it will allow users to choose between system stress level and rebalance throughput easily.

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