How to use

computeHash

method

in

org.apache.beam.sdk.testing.FileChecksumMatcher

/**
 * Computes a checksum of the sharded file specified in the constructor. Not safe to call until
 * the writing is complete.
 */
private String getActualChecksum() {
 if (actualChecksum == null) {
  // Load output data
  List<String> outputs;
  try {
   outputs = shardedFile.readFilesWithRetries(Sleeper.DEFAULT, BACK_OFF_FACTORY.backoff());
  } catch (Exception e) {
   throw new RuntimeException(String.format("Failed to read from: %s", shardedFile), e);
  }
  // Verify outputs. Checksum is computed using SHA-1 algorithm
  actualChecksum = computeHash(outputs);
  LOG.debug("Generated checksum: {}", actualChecksum);
 }
 return actualChecksum;
}