From e9240fc9d578dc1b4c8e6ab3550dffab25bd6f2b Mon Sep 17 00:00:00 2001
From: Paolo Di Tommaso <paolo.ditommaso@gmail.com>
Date: Sun, 1 Nov 2020 15:55:23 +0100
Subject: [PATCH] Add warning for AWS Batch mem request lower than 4 GB

---
 .../nextflow/cloud/aws/batch/AwsBatchTaskHandler.groovy  | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/modules/nf-amazon/src/main/nextflow/cloud/aws/batch/AwsBatchTaskHandler.groovy b/modules/nf-amazon/src/main/nextflow/cloud/aws/batch/AwsBatchTaskHandler.groovy
index 488908eb20..70278e82b3 100644
--- a/modules/nf-amazon/src/main/nextflow/cloud/aws/batch/AwsBatchTaskHandler.groovy
+++ b/modules/nf-amazon/src/main/nextflow/cloud/aws/batch/AwsBatchTaskHandler.groovy
@@ -546,8 +546,13 @@ class AwsBatchTaskHandler extends TaskHandler implements BatchHandler<String,Job
         def container = new ContainerOverrides()
         container.command = getSubmitCommand()
         // set the task memory
-        if( task.config.getMemory() )
-            container.memory = (int)task.config.getMemory().toMega()
+        if( task.config.getMemory() ) {
+            final mega = (int)task.config.getMemory().toMega()
+            if( mega >= 4 )
+                container.memory = mega
+            else
+                log.warn "Ignoring task $bean.name memory directive: ${task.config.getMemory()} -- AWS Batch job memory request cannot be lower than 4 MB"
+        }
         // set the task cpus
         if( task.config.getCpus() > 1 )
             container.vcpus = task.config.getCpus()