pybind/mgr/balancer: cancel plan if distribution is already perfect

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/src/pybind/mgr/balancer/module.py b/src/pybind/mgr/balancer/module.py
index a07ae8538257d2f174a78d4541f0ce245480a0ff..faf5cfd1c509f7dd0ff5e24cdbf009c5695522f7 100644 (file)
--- a/src/pybind/mgr/balancer/module.py
+++ b/src/pybind/mgr/balancer/module.py
@@ -679,6 +679,9 @@ class Module(MgrModule):
             if left <= 0:
                 break
         self.log.info('prepared %d/%d changes' % (total_did, max_iterations))
+        if total_did == 0:
+            return -errno.EALREADY, 'Unable to find further optimization,' \
+                                    'or distribution is already perfect'
         return 0, ''
 
     def do_crush_compat(self, plan):