Vladimir Ozerov created IGNITE-1550:
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Summary: Optimize "direct" message serialization.
Key: IGNITE-1550
URL: https://issues.apache.org/jira/browse/IGNITE-1550
Project: Ignite
Issue Type: Task
Components: general
Affects Versions: 1.1.4
Reporter: Vladimir Ozerov
Priority: Critical
Fix For: ignite-1.5
*Overview*
Ignite use "direct" serialization to speed up marshalling of internal classes
avoiding byte array copying.
This mechanism can be improved significantly on class-by-class basis reducing
message size by 10-30% in different cases.
*Implementation*
1) Definte the list of possible optimizations. At the very least it includes:
- Var-length integer encoding;
- Special cases (constants, positive-only values, low amount of significant
bits, etc.);
- Efficient writes of "nulls";
- Write groups of relates fields with boolean switch if they are either null or
not-null at the same time.
2) Determine what to optimize. This can be done on class-by-class basis for
each of ~180 messages. Better approach will be to enable tracking of written
values inside DirectMessageWriter. Then we should run Ignite with differnet
payloads and identify fields which are good candidates for optimization.
3) Implement each optimziation.
*Risks*
Backward compatibility will be broken. We must either inform users about it, or
support ability to use old non-optimized protocol version somehow.
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