joshgord

## dataloader-chaining.md

      
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                joshgord
                / dataloader-chaining.md
            
            
              Created
              February 14, 2026 21:49
            
              
                DataLoader Chaining: The loadAndDispatch Bottleneck — Analysis and Migration Plan
              
          
    DataLoader Chaining: The loadAndDispatch Bottleneck

Problem Summary

Gusto's GraphQL resolvers extensively use a pattern called loadAndDispatch() that defeats DataLoader batching, causing every chained DataLoader call to dispatch with a batch size of 1. This was identified as the primary driver of DataLoaderHelper being the #1 allocation source in production (48,910 samples / 11.6% of all allocations).

How the Bottleneck Was Identified


## BootstrapAgent.java
package net.bytebuddy;

import net.bytebuddy.agent.ByteBuddyAgent;
import net.bytebuddy.agent.builder.AgentBuilder;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.ClassFileLocator;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.dynamic.loading.ClassInjector;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.bind.annotation.SuperCall;

## test.xml
whatamidoing

## test.xml
whatamidoing
	package net.bytebuddy;

	import net.bytebuddy.agent.ByteBuddyAgent;
	import net.bytebuddy.agent.builder.AgentBuilder;
	import net.bytebuddy.description.type.TypeDescription;
	import net.bytebuddy.dynamic.ClassFileLocator;
	import net.bytebuddy.dynamic.DynamicType;
	import net.bytebuddy.dynamic.loading.ClassInjector;
	import net.bytebuddy.implementation.MethodDelegation;
	import net.bytebuddy.implementation.bind.annotation.SuperCall;