public synchronized String dump() {
      StringBuilder sb = new StringBuilder("prIdToPR Map@");
      sb.append(System.identityHashCode(prIdToPR)).append(':').append(lineSeparator());
      Map.Entry mapEntry;
      for (Iterator iterator = prIdToPR.entrySet().iterator(); iterator.hasNext();) {
        mapEntry = (Map.Entry) iterator.next();
        sb.append(mapEntry.getKey()).append("=>").append(mapEntry.getValue());
        if (iterator.hasNext()) {
          sb.append(lineSeparator());
        }
      }
      return sb.toString();
    }
Clear the prIdMap, typically used when disconnecting from the distributed system or clearing
the cache
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegion.java