boolean awaitBlobDeletions() throws InterruptedException {
    return deletionHelper.await(WAIT_SECONDS, TimeUnit.SECONDS);
  }
Waits for blob deletions on all replicas
@return {@code true} if deletions were received in all replicas.
@throws InterruptedException
ambry-test-utils/src/main/java/com/github/ambry/server/MockCluster.java