public boolean storeExists(File storeDir) {
    return storeDir.exists() && storeDir.list().length > 0;
  }
Check if a store's disk footprint exists.

@param storeDir the base directory of the store
@return true if a non-empty storeDir exists, false otherwise
samza-core/src/main/java/org/apache/samza/storage/StorageManagerUtil.java