EvictionController getExistingPREvictionContoller(PartitionedRegion pr) {
    final String prName = pr.getFullPath();
    synchronized (prEvictionControllerMap) {
      return prEvictionControllerMap.get(prName);
    }
  }
If we have recovered a bucket earlier for the given pr then we will have an EvictionController
to return for it. Otherwise return null.
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java