Make AllocationService#adaptAutoExpandReplicas Faster #83092
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This method is getting fairly expensive for large cluster states. In most cases it is not necessary to actually compute the `RoutingAllocation` so I made that lazy to save potentially needlessly building routing nodes. Also, parsing the auto-expand-replicas setting gets quite expensive when looping over thousands of shards in this method so I moved the auto-expand setting value into the index metadata. These changes make the method disappear from profiling in most cases and help make reroute yet a bit faster.
original-brownbear
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>enhancement
:Distributed Coordination/Allocation
elasticmachine
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Team:Distributed (Obsolete)
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Pinging @elastic/es-distributed (Team:Distributed) |
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Hi @original-brownbear, I've created a changelog YAML for you. |
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| private final AllocationDeciders deciders; | |||
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| @Nullable | |||
| private final RoutingNodes routingNodes; | |||
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We don't need to generate this when constructing the object. In some cases the routing nodes are never needed for the concrete cluster state passed in here because none of the allocators care about it. So we can selectively make it lazy like this and pass in the mutable variant as an override.
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Thanks David! |
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This method is getting fairly expensive for large cluster states.
In most cases it is not necessary to actually compute the
RoutingAllocationso I made that lazy to save potentially needlessly building routing nodes.
Also, parsing the auto-expand-replicas setting gets quite expensive when looping
over thousands of shards in this method so I moved the auto-expand setting value
into the index metadata.
These changes make the method disappear from profiling in most cases and help
make reroute yet a bit faster.
relates #77466