output: #fixed code
                                @Override
    public Status delete(String table, String key) {
      if (debug) {
        System.out.println("Doing delete for key: " + key);
      }
      
      setTable(table);
      
      final MutateRowRequest.Builder rowMutation = MutateRowRequest.newBuilder()
          .setRowKey(ByteString.copyFromUtf8(key))
          .setTableNameBytes(ByteStringer.wrap(lastTableBytes));
      rowMutation.addMutationsBuilder().setDeleteFromRow(
          DeleteFromRow.getDefaultInstance());
      
      try {
        if (clientSideBuffering) {
          bulkMutation.add(rowMutation.build());
        } else {
          client.mutateRow(rowMutation.build());
        }
        return Status.OK;
      } catch (RuntimeException e) {
        System.err.println("Failed to delete key: " + key + " " + e.getMessage());
        return Status.ERROR;
      }
    }
input: #vulnerable code 
                                @Override
    public Status delete(String table, String key) {
      if (debug) {
        System.out.println("Doing delete for key: " + key);
      }
      
      setTable(table);
      
      final MutateRowRequest.Builder rowMutation = MutateRowRequest.newBuilder()
          .setRowKey(ByteString.copyFromUtf8(key))
          .setTableNameBytes(ByteStringer.wrap(lastTableBytes));
      rowMutation.addMutationsBuilder().setDeleteFromRow(
          DeleteFromRow.getDefaultInstance());
      
      try {
        if (clientSideBuffering) {
          asyncExecutor.mutateRowAsync(rowMutation.build());
        } else {
          client.mutateRow(rowMutation.build());
        }
        return Status.OK;
      } catch (ServiceException e) {
        System.err.println("Failed to delete key: " + key + " " + e.getMessage());
        return Status.ERROR;
      } catch (InterruptedException e) {
        System.err.println("Interrupted while delete key: " + key + " " 
            + e.getMessage());
        Thread.currentThread().interrupt();
        return Status.ERROR; // never get here, but lets make the compiler happy
      }
    } 
                              #location 17 
                              #vulnerability type THREAD_SAFETY_VIOLATION