Ignore accelerator type for AWS Batch (#4043)

Signed-off-by: Ben Sherman <bentshermann@gmail.com>
Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>
Co-authored-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>

docs/process.md

@@ -1201,9 +1201,10 @@ This directive is only used by certain executors. Refer to the {ref}`executor-pa
 :::{note}
 The accelerator `type` option depends on the target execution platform. Refer to the platform-specific documentation for details on the available accelerators:
 
-- [AWS](https://aws.amazon.com/batch/faqs/?#GPU_Scheduling_)
 - [Google Cloud](https://cloud.google.com/compute/docs/gpus/)
 - [Kubernetes](https://kubernetes.io/docs/tasks/manage-gpus/scheduling-gpus/#clusters-containing-different-types-of-gpus)
+
+The accelerator `type` option is not supported for AWS Batch. You can control the accelerator type indirectly through the allowed instance types in your Compute Environment. See the [AWS Batch FAQs](https://aws.amazon.com/batch/faqs/?#GPU_Scheduling_) for more information.
 :::
 
 (process-afterscript)=

plugins/nf-amazon/src/main/nextflow/cloud/aws/batch/AwsBatchTaskHandler.groovy

@@ -59,7 +59,6 @@ import nextflow.container.ContainerNameValidator
 import nextflow.exception.ProcessSubmitException
 import nextflow.exception.ProcessUnrecoverableException
 import nextflow.executor.BashWrapperBuilder
-import nextflow.executor.res.AcceleratorResource
 import nextflow.fusion.FusionAwareTask
 import nextflow.processor.BatchContext
 import nextflow.processor.BatchHandler
@@ -715,8 +714,12 @@ class AwsBatchTaskHandler extends TaskHandler implements BatchHandler<String,Job
         if( task.config.getCpus() > 1 )
             resources << new ResourceRequirement().withType(ResourceType.VCPU).withValue(task.config.getCpus().toString())
 
-        if( task.config.getAccelerator() )
-            resources << createGpuResource(task.config.getAccelerator())
+        final accelerator = task.config.getAccelerator()
+        if( accelerator ) {
+            if( accelerator.type )
+                log.warn1 "Ignoring task ${task.lazyName()} accelerator type: ${accelerator.type} -- AWS Batch doesn't support accelerator type in job definition"
+            resources << new ResourceRequirement().withType(ResourceType.GPU).withValue(accelerator.request.toString())
+        }
 
         if( resources )
             container.withResourceRequirements(resources)
@@ -731,15 +734,6 @@ class AwsBatchTaskHandler extends TaskHandler implements BatchHandler<String,Job
         return result
     }
 
-    protected ResourceRequirement createGpuResource(AcceleratorResource acc) {
-        final res = new ResourceRequirement()
-        final type = acc.type ?: 'GPU'
-        final count = acc.request?.toString() ?: '1'
-        res.setType(type.toUpperCase())
-        res.setValue(count)
-        return res
-    }
-
     /**
      * @return The list of environment variables to be defined in the Batch job execution context
      */