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Any of two events above causes Ignite node to freeze all updates until the end of current checkpoint. That's why operations/sec graph falls to zero.

Checkpoint buffer overflow protection is always enabled. 

• If checkpoint buffer is being filled too fast. Fill ratio more than 66% triggers throttling.

Since Ignite 2.3, data storage configuration has writeThrottlingEnabled property. If it's enabled, two following possible situations situation that can trigger throttling: 

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• If percentage of dirty pages increases too rapidly.

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