@Override
  public boolean removeBlobStore(PartitionId id) {
    try {
      lock.writeLock().lock();
      return partitionToStore.remove(id) != null;
    } finally {
      lock.writeLock().unlock();
    }
  }
Returning null because this will not be used as part of CloudStorageManager Implementation.
Implementation will be added if needed.
ambry-cloud/src/main/java/com/github/ambry/cloud/CloudStorageManager.java