@Override
  public void removeAll(Collection keys) {
    removeAll(keys, null);
  }
Called on a cache server when it has a received a removeAll command from a client.

@param keys a collection of the keys we are putting
@param retryVersions a collection of version tags. If the client is retrying a key then that
       keys slot will be non-null in this collection. Note that keys and retryVersions are
       parallel lists.
@param callbackArg callback argument from client
@param isRetry whether this is a client retry
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java