clusterimpl: update picker synchronously upon receipt of configuration update #7210
Open
Description
#5469 recommends an audit of existing LB policies to ensure that they update their pickers synchronously upon receipt of a configuration update.
xds_cluster_impl_experimental does not update its picker synchronously.
- Configuration updates are handled here:
- In the above function, the LB policy
- initially checks for some error conditions
- applies new load reporting configuration, if any
- switches to a new child policy, if the child policy name has changed
- pushes the newly received load balancer configuration onto a channel here:
- and returns from
UpdateClientConnState
- The newly received configuration update is processed here asynchronously:
- And a new picker is pushed upwards here:
This needs to be changed to return a picker synchronously upon receipt of a configuration update.