A 2019-10-01T03:17:00.907Z PROD-PDF-XXXX 718747420330136 
    Unhandled rejection PROD-PDF-XXXX 718747420330136
E 2019-10-01T03:17:00.910Z PROD-PDF-XXXX 718747420330136 
    Error: Could not load the default credentials. Browse to https://cloud.google.com/docs/authentication/getting-started for more information.
    at GoogleAuth.getApplicationDefaultAsync (/srv/functions/node_modules/google-auth-library/build/src/auth/googleauth.js:161:19)
    at process._tickCallback (internal/process/next_tick.js:68:7) PROD-PDF-XXXX 718747420330136 

if(statusUpdateResult.affectedRows < 1){
        // to avoid race conditions from concurrent competing threads, lets make sure this thread 
        // was the one that updated the status first
        let concurrentThreadError = Error('Not the first to update status to processing so exiting');
        console.error(concurrentThreadError);
        return concurrentThreadError;
      } else {
        // status updated and ready for processing
        console.log(`Updated pdf id ${pdfRecord.pdf_id} to queuing_vision.`);
      }
      
      // queue the file for processing by vision API
      const gcsSourceUri = `gs://${bucketName}/${fileName}`;
      const gcsDestinationUri = `gs://${ocrJSONBucket}/${fileName}.json`;

      const inputConfig = {
        // Supported mime_types are: 'application/pdf' and 'image/tiff'
        mimeType: 'application/pdf',
        gcsSource: {
          uri: gcsSourceUri,
        },
      };
      const outputConfig = {
        gcsDestination: {
          uri: gcsDestinationUri,
        },
      };
      const features = [{type: 'DOCUMENT_TEXT_DETECTION'}];
      const request = {
        requests: [
          {
            inputConfig: inputConfig,
            features: features,
            outputConfig: outputConfig,
          },
        ],
      };
      console.log(processingOperation);
      var processingOperation;
      try {
        processingOperation = visionClient.asyncBatchAnnotateFiles(request); 
      } catch(processingError) {
        console.error(processingError);
        return processingError;
      }
      console.log(processingOperation);