TopologyValidator blocks cache write operations on this topology and it can
be unblocked only after new topology changes.
Looks like Ignite doesn't have what you want out of the box and you need to
impelement it yourself. For example, you can introduce flag
isClusterAccessible, which will have default value "true" and will be set to
"false" when you received EVT_CACHE_REBALANCE_PART_DATA_LOST event
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