i've been having some issues with EC2 too. Are you actually paging from memory to disk or just using the WAL for durable memory? you can use a different walMode to make it "better". https://ignite.apache.org/releases/latest/javadoc/org/apache/ignite/configuration/WALMode.html. I was playing with <property name="walMode" value="BACKGROUND"/> <property name="walFlushFrequency" value="10000"/> Which means it flushes the wall every 10 seconds in the background
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