void startRedundancyRecovery() {
    partitionedRegion.getRegionAdvisor().addMembershipListener(new PRMembershipListener());
    scheduleRedundancyRecovery(null);
  }
Adds a membership listener to watch for member departures, and schedules a task to recover
redundancy of existing buckets
geode-core/src/main/java/org/apache/geode/internal/cache/PRHARedundancyProvider.java