Hive attempts to 'chgrp' files on s3a://

hive> insert into INVENTORY select * from INVENTORY_Q1_2006;
-chgrp: '' does not match expected pattern for group
Usage: hadoop fs [generic options] -chgrp [-R] GROUP PATH...

hive> insert into INVENTORY select * from INVENTORY_Q1_2006;
-chgrp: '' does not match expected pattern for group
Usage: hadoop fs [generic options] -chgrp [-R] GROUP PATH...
Query ID = admin_20160617201151_5f953fbe-acde-4774-9ad7-06cffc76dd72
Total jobs = 1
Launching Job 1 out of 1

Status: Running (Executing on YARN cluster with App id application_1466165341299_0011)

--------------------------------------------------------------------------------
        VERTICES      STATUS  TOTAL  COMPLETED  RUNNING  PENDING  FAILED  KILLED
--------------------------------------------------------------------------------
Map 1 ..........   SUCCEEDED      1          1        0        0       0       0
--------------------------------------------------------------------------------
VERTICES: 01/01  [==========================>>] 100%  ELAPSED TIME: 8.71 s
--------------------------------------------------------------------------------
Loading data to table mydb.inventory
-chgrp: '' does not match expected pattern for group
Usage: hadoop fs [generic options] -chgrp [-R] GROUP PATH...
Table mydb.inventory stats: [numFiles=12, numRows=6020352, totalSize=25250706, rawDataSize=96325632]
OK
Time taken: 19.123 seconds

CREATE TABLE IF NOT EXISTS inventory
   (
        MONTH_ID int,
        ITEM_ID int,
        BOH_QTY float,
        EOH_QTY float
   ) row format delimited fields terminated by '|' escaped by '\\' stored as ORC
LOCATION 's3a://mybucket/hive/warehouse/mydb.db/inventory'
tblproperties ("orc.compress"="SNAPPY");