feat(server): adoption for off-heap memory management in kout module

[Pengzna]

wip...

[codecov]

Codecov Report

Attention: Patch coverage is 34.35115% with 86 lines in your changes missing coverage. Please review.

Project coverage is 37.15%. Comparing base (f0b1395) to head (db3ee80).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...e/hugegraph/memory/consumer/factory/IdFactory.java	0.00%	39 Missing ⚠️
...a/org/apache/hugegraph/api/traversers/KoutAPI.java	61.90%	7 Missing and 1 partial ⚠️
...graph/memory/consumer/factory/PropertyFactory.java	0.00%	8 Missing ⚠️
...g/apache/hugegraph/backend/store/BackendTable.java	0.00%	7 Missing ⚠️
...main/java/org/apache/hugegraph/util/Consumers.java	57.14%	5 Missing and 1 partial ⚠️
...graph/backend/cache/CachedSchemaTransactionV2.java	0.00%	5 Missing ⚠️
...g/apache/hugegraph/structure/HugeEdgeProperty.java	0.00%	3 Missing ⚠️
...ava/org/apache/hugegraph/schema/SchemaElement.java	33.33%	1 Missing and 1 partial ⚠️
.../java/org/apache/hugegraph/structure/HugeEdge.java	66.66%	1 Missing and 1 partial ⚠️
...ava/org/apache/hugegraph/structure/HugeVertex.java	66.66%	1 Missing and 1 partial ⚠️
... and 4 more

❗ There is a different number of reports uploaded between BASE (f0b1395) and HEAD (db3ee80). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (f0b1395)	HEAD (db3ee80)
	7	1

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2704      +/-   ##
============================================
- Coverage     46.99%   37.15%   -9.85%     
+ Complexity      821      493     -328     
============================================
  Files           745      745              
  Lines         60062    60148      +86     
  Branches       7670     7687      +17     
============================================
- Hits          28225    22345    -5880     
- Misses        29014    35354    +6340     
+ Partials       2823     2449     -374     

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