Petr Gusev a8c36aad0b vnode_erm: optimize replication_map ...

We optimise memory usage of replication_map by
storing endpoints list only once in case of
natural_endpoints_depend_on_token() == false. For simplicity,
this list is stored in the same unordered_map with
special key default_replication_map_key.

We inline both get_natural_endpoints and
for_each_natural_endpoint_until from abstract_replication_strategy
into vnode_erm since now the overrides in local and everywhere
strategies are redundant. The default implementation works
for them as empty sorted_tokens() is not a problem, we
store endpoints with a special key.

Function do_get_natural_endpoints was extracted,
since get_natural_endpoints returns by val,
but for_each_natural_endpoint_until reference in sufficient.

2023-05-21 13:17:42 +04:00

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