code: public void commitBlockInUfs(final long blockId, final long length)
        throws IOException {
      retryRPC((RpcCallable<Void>) () -> {
        CommitBlockInUfsPRequest request =
            CommitBlockInUfsPRequest.newBuilder().setBlockId(blockId).setLength(length).build();
        mClient.commitBlockInUfs(request);
        return null;
      });
    }
docs: Commits a block in Ufs.
  
  @param blockId the block id being committed
  @param length the length of the block being committed