Share volumes between docker stacks? - apache-spark

Question

I have two different docker stacks, one for HBase and one for Spark. I need to get the HBase jars into the spark path. One way that I can do this, without having to modify the spark containers is to use a volume. In my docker-compose.yml for HBase, I have defined a volume that points to the HBase home (it happens to be /opt/hbase-1.2.6). Is it possible to share that volume with the spark stack?
Right now, since the service names are different (2 different docker-compose files) the volumes are being prepended (hbase_hbasehome and spark_hbasehome) causing the share to fail.

Answer 1

You could use an external volume. See here the official documentation:
if set to true, specifies that this volume has been created outside of
Compose. docker-compose up does not attempt to create it, and raises
an error if it doesn’t exist.
external cannot be used in conjunction with other volume configuration
keys (driver, driver_opts).
In the example below, instead of attempting to create a volume called
[projectname]_data, Compose looks for an existing volume simply called
data and mount it into the db service’s containers.
As an example:
version: '2'
services:
db:
image: postgres
volumes:
- data:/var/lib/postgresql/data
volumes:
data:
external: true
You can also specify the name of the volume separately from the name used to refer to it within the Compose file:
volumes:
data:
external:
name: actual-name-of-volume