code: private void openInputStream(File txFile) throws IOException {
      int ioExceptionRetryCount = 0, logHeaderCorruptRetryCount = 0;
      
      LOG.info("Trying to load the edit log from " + txFile.getAbsolutePath());
      
      do {
        try {
          inputStream = new EditLogFileInputStream(txFile);
          editLogFilePosition = inputStream.getPosition();
          curStreamConsumed = false;
          curStreamFinished = false;
          readNullAfterStreamFinished = false;
          LOG.info("Successfully loaded the edits log from " +
              txFile.getAbsolutePath());
          break;
          
        } catch (LogHeaderCorruptException e1) {
          if (logHeaderCorruptRetryCount == LOG_HEADER_CORRUPT_RETRY_MAX) {
            LOG.error("Failed to load the edit log. No retries left.", e1);
            throw new IOException("Could not load the edit log");
          }
          logHeaderCorruptRetryCount ++;
          LOG.warn("Failed to load the edit log. Retry " +
              logHeaderCorruptRetryCount + " ...", e1);
          try {
            Thread.sleep(ioExceptionRetryCount * LOG_HEADER_CORRUPT_BASE_SLEEP);
          } catch (InterruptedException e) {
            throw new IOException(e);
          }
          
        } catch (IOException e2) {
          if (ioExceptionRetryCount == IO_EXCEPTION_RETRY_MAX) {
            LOG.error("Failed to load the edit log. No retries left.", e2);
            throw new IOException("Could not load the edit log");
          }
          ioExceptionRetryCount ++;
          LOG.warn("Failed to load the edit log. Retry " +
              ioExceptionRetryCount + " ...", e2);
          try {
            Thread.sleep(ioExceptionRetryCount * IO_EXCEPTION_BASE_SLEEP);
          } catch (InterruptedException e) {
            throw new IOException(e);
          }
        }
        
      } while (true);
    }
docs: Tries opening the input stream.
  @param txFile the file from which to load the input stream
  @throws IOException If the input stream couldn't be loaded. This error
  is fatal.