Aleksey Plekhanov created IGNITE-22375:
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Summary: Inefficient serialization of UUIDs in communication
messages
Key: IGNITE-22375
URL: https://issues.apache.org/jira/browse/IGNITE-22375
Project: Ignite
Issue Type: Bug
Reporter: Aleksey Plekhanov
Assignee: Aleksey Plekhanov
We serialize {{long}} and {{int}} data types in communication messages as
{{varint}} to safe the space. UUID contains two {{long}} components
{{LeastSignificantBits}} and {{
MostSignificantBits}}, which currently serialized as {{varint}} too. But
usually UUIDs are generated randomly and in most cases the are no any space
optimization for random {{long}} values. To store {{long}} as 7 bytes or less
in {{varint}} format (instead of 8 bytes to store {{long}} as is) it's required
it's required top 15 bits of {{{}long{}}}. Probability of such outcame for
random long: 1/32768.
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