[bcp][worker] Add parameter for changing the volume mount point for the cache

beat/core/bcp/worker.py

@@ -41,22 +41,24 @@ Based on the Majordomo Protocol worker example of the ZMQ Guide.
 Usage:
   %(prog)s [-v ... | --verbose ...] [ --name=<name>] [--prefix=<path>]
            [--cache=<path>] [--docker] [--docker-network=<name>]
-           [--port-range=<range>] <broker_address>
+           [--port-range=<range>] [--cache-mount-point=<cache_mount_point>]
+           <broker_address>
   %(prog)s (--help | -h)
   %(prog)s (--version | -V)
 
 
 Options:
-  -h, --help                 Show this screen
-  -V, --version              Show version
-  -v, --verbose              Increases the output verbosity level
-  -n <name>, --name=<name>   The unique name of this worker on the database.
-                             This is typically the assigned hostname of the node,
-                             but not necessarily [default: %(hostname)s]
-  -p, --prefix=<path>        Comma-separated list of the prefix(es) of your local data [default: .]
-  -c, --cache=<path>         Cache prefix, otherwise defaults to '<prefix>/cache'
-  --docker-network=<name>    Name of the docker network to use
-  --port-range=<range>  Range of port usable for communication with containers
+  -h, --help                              Show this screen
+  -V, --version                           Show version
+  -v, --verbose                           Increases the output verbosity level
+  -n <name>, --name=<name>                The unique name of this worker on the database.
+                                          This is typically the assigned hostname of the node,
+                                          but not necessarily [default: %(hostname)s]
+  -p, --prefix=<path>                     Comma-separated list of the prefix(es) of your local data [default: .]
+  -c, --cache=<path>                      Cache prefix, otherwise defaults to '<prefix>/cache'
+  --docker-network=<name>                 Name of the docker network to use
+  --port-range=<range>                    Range of port usable for communication with containers
+  --cache-mount-point=<cache_mount_point> NFS mount point to use for cache setup
 
 """
 
@@ -107,6 +109,7 @@ def run(
     docker_network_name=None,
     docker_port_range=None,
     docker_images_cache=None,
+    docker_cache_mount_point=None,
 ):
     """Start the worker
 
@@ -202,6 +205,8 @@ def run(
                         data["network_name"] = docker_network_name
                     if docker_port_range:
                         data["port_range"] = docker_port_range
+                    if docker_cache_mount_point:
+                        data["cache_mount_point"] = docker_cache_mount_point
 
                 # Start the execution
                 logger.info("Running '%s' with job id #%s", data["algorithm"], job_id)
@@ -319,6 +324,14 @@ def main(argv=None):
                 return 1
             logger.info("Using port range %s", docker_port_range)
 
+        docker_cache_mount_point = args.get("--cache-mount-point", None)
+        if docker_cache_mount_point:
+            if not docker_cache_mount_point.startswith("nfs://"):
+                raise RuntimeError(
+                    "Invalid nfs mount point: {}".format(docker_cache_mount_point)
+                )
+            logger.info("Using volume cache mount point %s", docker_cache_mount_point)
+
     return run(
         broker_address,
         service_name=args.get("--name"),
@@ -329,6 +342,7 @@ def main(argv=None):
         docker_network_name=docker_network_name,
         docker_port_range=docker_port_range,
         docker_images_cache=docker_images_cache,
+        docker_cache_mount_point=docker_cache_mount_point,
     )