diff --git a/s3/src/main/scala/geotrellis/spark/io/s3/cog/S3COGLayerWriter.scala b/s3/src/main/scala/geotrellis/spark/io/s3/cog/S3COGLayerWriter.scala
index 3774e3dc11..ca177f47f3 100644
--- a/s3/src/main/scala/geotrellis/spark/io/s3/cog/S3COGLayerWriter.scala
+++ b/s3/src/main/scala/geotrellis/spark/io/s3/cog/S3COGLayerWriter.scala
@@ -1,9 +1,6 @@
 package geotrellis.spark.io.s3.cog
 
-import com.amazonaws.services.s3.model.AmazonS3Exception
 import geotrellis.raster._
-import geotrellis.raster.crop._
-import geotrellis.raster.merge._
 import geotrellis.raster.io.geotiff.GeoTiff
 import geotrellis.raster.io.geotiff.writer.GeoTiffWriter
 import geotrellis.spark._
@@ -13,13 +10,13 @@ import geotrellis.spark.io.s3.{S3AttributeStore, S3Client, S3RDDWriter, makePath
 import geotrellis.spark.io.cog._
 import geotrellis.spark.io.cog.vrt.VRT
 import geotrellis.spark.io.cog.vrt.VRT.IndexedSimpleSource
-import scala.util.Try
 
 import spray.json.JsonFormat
 import com.amazonaws.services.s3.model.{AmazonS3Exception, ObjectMetadata, PutObjectRequest}
 
 import java.io.ByteArrayInputStream
 
+import scala.util.Try
 import scala.reflect.ClassTag
 
 class S3COGLayerWriter(
@@ -56,7 +53,7 @@ class S3COGLayerWriter(
       case _ => false
     }
 
-    for { (zoomRange, cogs) <- cogLayer.layers.toSeq.sortBy(_._1)(Ordering[ZoomRange].reverse) } {
+    for((zoomRange, cogs) <- cogLayer.layers.toSeq.sortBy(_._1)(Ordering[ZoomRange].reverse)) {
       val vrt = VRT(cogLayer.metadata.tileLayerMetadata(zoomRange.minZoom))
 
       // Make RDD[(String, GeoTiff[T])]
@@ -77,9 +74,7 @@ class S3COGLayerWriter(
 
           (s"${keyPath(key)}.${Extension}", cog)
         }
-        .foreachPartition {  partition =>
-          asyncWriter.write(getS3Client(), partition, mergeFunc, Some(retryCheck))
-        }
+        .foreachPartition { partition => asyncWriter.write(getS3Client(), partition, mergeFunc, Some(retryCheck)) }
 
       // Save Accumulator
       val bytes =
diff --git a/s3/src/test/scala/geotrellis/spark/io/s3/cog/COGS3SpaceTimeSpec.scala b/s3/src/test/scala/geotrellis/spark/io/s3/cog/COGS3SpaceTimeSpec.scala
index 52f14d1b20..b5af431561 100644
--- a/s3/src/test/scala/geotrellis/spark/io/s3/cog/COGS3SpaceTimeSpec.scala
+++ b/s3/src/test/scala/geotrellis/spark/io/s3/cog/COGS3SpaceTimeSpec.scala
@@ -35,7 +35,8 @@ class COGS3SpaceTimeSpec
     with COGSpaceTimeKeyIndexMethods
     with TestEnvironment
     with COGTestFiles
-    with COGCoordinateSpaceTimeSpec {
+    with COGCoordinateSpaceTimeSpec
+    with COGLayerUpdateSpaceTimeTileSpec {
 
   registerAfterAll { () =>
     MockS3Client.reset()
diff --git a/spark/src/main/scala/geotrellis/spark/io/AsyncWriter.scala b/spark/src/main/scala/geotrellis/spark/io/AsyncWriter.scala
index a1ad373eef..f8213ddcab 100644
--- a/spark/src/main/scala/geotrellis/spark/io/AsyncWriter.scala
+++ b/spark/src/main/scala/geotrellis/spark/io/AsyncWriter.scala
@@ -17,7 +17,8 @@
 package geotrellis.spark.io
 
 import java.util.concurrent.Executors
-import scala.util.Try
+
+import scala.util.{Failure, Success, Try}
 import scalaz.concurrent.{Strategy, Task}
 import scalaz.stream.{Process, nondeterminism}
 
@@ -51,11 +52,11 @@ abstract class AsyncWriter[Client, V, E](threads: Int) extends Serializable {
         mergeFunc match {
           case Some(fn) =>
             // TODO: match on this failure to retry reads
-            val oldValue = readRecord(client, key).get
-            (key, fn(oldValue, newValue))
-
-          case None =>
-            newRecord
+            readRecord(client, key) match {
+              case Success(oldValue) => (key, fn(oldValue, newValue))
+              case Failure(_) => newRecord
+            }
+          case None => newRecord
         }
       }