Commits on Jul 28, 2023

1. feat(admin): speed up fetching cluster metadata …

   This PR improves `internal/admin/mrmanager.(*mrManager).ClusterMetadata` performance:
   
   - Fail-fast: If the given context is canceled, it returns a context error without acquiring the
     mutex.
   - Fast-path: If the cluster metadata does not need to update, it returns the existing thing without
     the exclusive lock.
   - Slow-path: It is similar to the previous implementation but shares the updated cluster metadata
     using a singleflight.
   
   This PR makes the `internal/admin/mrmanager.(*mrManager).ClusterMetadata` more concurrent and
   removes unnecessary RPCs. It also avoids RPC calls within exclusive mutex.

   

   ijsong committed Jul 28, 2023
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