make rdzv backend defaults reasonable

Author: MichaelClifford

requirements.txt

@@ -2,4 +2,4 @@ openshift-client==1.0.18
 rich==12.5.1
 ray[default]==2.1.0
 kubernetes==26.1.0
-codeflare-torchx==0.5.0.dev5
+codeflare-torchx==0.6.0.dev0

src/codeflare_sdk/job/jobs.py

@@ -61,7 +61,7 @@ def __init__(
         max_retries: int = 0,
         mounts: Optional[List[str]] = None,
         rdzv_port: int = 29500,
-        rdzv_backend: str = "c10d",
+        rdzv_backend: str = None,
         scheduler_args: Optional[Dict[str, str]] = None,
         image: Optional[str] = None,
     ):
@@ -106,7 +106,9 @@ def _dry_run(self, cluster: "Cluster"):
                 env=self.env,
                 max_retries=self.max_retries,
                 rdzv_port=self.rdzv_port,
-                rdzv_backend=self.rdzv_backend,
+                rdzv_backend=self.rdzv_backend
+                if self.rdzv_backend is not None
+                else "static",
                 mounts=self.mounts,
             ),
             scheduler=cluster.torchx_scheduler,
@@ -145,7 +147,9 @@ def _dry_run_no_cluster(self):
                 env=self.env,  # should this still exist?
                 max_retries=self.max_retries,
                 rdzv_port=self.rdzv_port,  # should this still exist?
-                rdzv_backend=self.rdzv_backend,
+                rdzv_backend=self.rdzv_backend
+                if self.rdzv_backend is not None
+                else "c10d",
                 mounts=self.mounts,
                 image=self.image
                 if self.image is not None