- Add a missing change.

- Code optimization and polishing.
- Update dependencies.

build.gradle

@@ -52,9 +52,9 @@ dependencies {
     implementation("org.apache.commons:commons-compress:1.24.0") {
         exclude group: 'com.github.luben', module: 'zstd-jni'
     }
-    implementation 'com.github.luben:zstd-jni:1.5.5-5'  // Even though this is part of the above dependency, the Apache commons rarely updates it, while the zstd team makes improvements very often.
+    implementation 'com.github.luben:zstd-jni:1.5.5-6'  // Even though this is part of the above dependency, the Apache commons rarely updates it, while the zstd team makes improvements very often.
 
-    implementation 'io.minio:minio:8.5.5'
+    implementation 'io.minio:minio:8.5.6'
 
     // https://mvnrepository.com/artifact/com.cloudera.impala/jdbc
     implementation("com.cloudera.impala:jdbc:2.5.31") {

src/main/java/eu/openaire/urls_controller/components/ScheduledTasks.java

@@ -111,7 +111,7 @@ public class ScheduledTasks {
                     // Add check for the value, if wanted.. (we don't care at the moment)
                 } catch (ExecutionException ee) {
                     String stackTraceMessage = GenericUtils.getSelectiveStackTrace(ee, null, 15);	// These can be serious errors like an "out of memory exception" (Java HEAP).
-                    logger.error("Task_" + (i+1) + " failed with: " + ee.getMessage() + "\n" + stackTraceMessage);
+                    logger.error("Task_" + (i+1) + " failed with: " + ee.getMessage() + GenericUtils.endOfLine + stackTraceMessage);
                 } catch (CancellationException ce) {
                     logger.error("Task_" + (i+1) + " was cancelled: " + ce.getMessage());
                 } catch (IndexOutOfBoundsException ioobe) {
@@ -375,13 +375,13 @@ public class ScheduledTasks {
 
     private boolean processFailedWorkerReport(File workerReportFile, String workerReportName)
     {
-        logger.debug("Going to load and parse the workerReport: " + workerReportName);
+        logger.debug("Going to load and parse the failed workerReport: " + workerReportName);
 
         // Load the file's json content into a "WorkerReport" object.
         try ( BufferedReader bfRead = new BufferedReader(new FileReader(workerReportFile), FileUtils.halfMb) ) {
             String line;
             while ( (line = bfRead.readLine()) != null )    // The line, without any line-termination-characters.
-                jsonStringBuilder.append(line).append("\n");
+                jsonStringBuilder.append(line).append(GenericUtils.endOfLine);
         } catch (Exception e) {
             logger.error("Problem when acquiring the contents of workerReport \"" + workerReportName + "\"");
             jsonStringBuilder.setLength(0); // Reset the StringBuilder without de-allocating.

src/main/java/eu/openaire/urls_controller/controllers/BulkImportController.java

@@ -57,15 +57,15 @@ public class BulkImportController {
 
     public BulkImportController(BulkImportService bulkImportService, BulkImport bulkImport)
     {
-        String bulkImportReportLocation1;
+        String bulkImportReportLocationTemp;
         this.baseBulkImportLocation = bulkImport.getBaseBulkImportLocation();
 
         this.bulkImportSources = new HashMap<>(bulkImport.getBulkImportSources());
 
-        bulkImportReportLocation1 = bulkImport.getBulkImportReportLocation();
+        bulkImportReportLocationTemp = bulkImport.getBulkImportReportLocation();
-        if ( !bulkImportReportLocation1.endsWith("/") )
+        if ( !bulkImportReportLocationTemp.endsWith("/") )
-            bulkImportReportLocation1 += "/";
+            bulkImportReportLocationTemp += "/";
-        this.bulkImportReportLocation = bulkImportReportLocation1;
+        this.bulkImportReportLocation = bulkImportReportLocationTemp;
 
         this.bulkImportService = bulkImportService;
 
@@ -90,8 +90,8 @@ public class BulkImportController {
 
 
     @PostMapping("bulkImportFullTexts")
-    public ResponseEntity<?> bulkImportFullTexts(@RequestParam String provenance, @RequestParam String bulkImportDir, @RequestParam boolean shouldDeleteFilesOnFinish) {
+    public ResponseEntity<?> bulkImportFullTexts(@RequestParam String provenance, @RequestParam String bulkImportDir, @RequestParam boolean shouldDeleteFilesOnFinish)
-
+    {
         BulkImport.BulkImportSource bulkImportSource = bulkImportSources.get(provenance);
         if ( bulkImportSource == null ) {
             String errorMsg = "The provided provenance \"" + provenance + "\" is not in the list of the bulk-imported sources, so no configuration-rules are available!";
@@ -228,7 +228,7 @@ public class BulkImportController {
         FileUtils.fileAccessLock.lock();
         try ( BufferedReader in = new BufferedReader(new InputStreamReader(Files.newInputStream(Paths.get(this.bulkImportReportLocation, bulkImportReportId + ".json"))), FileUtils.twentyFiveKb) ) {
             while ( (line = in.readLine()) != null )
-                stringBuilder.append(line).append("\n");    // The "readLine()" does not return the line-term char.
+                stringBuilder.append(line).append(GenericUtils.endOfLine);    // The "readLine()" does not return the line-term char.
         } catch (NoSuchFileException nsfe) {
             logger.warn("The requested report-file with ID: \"" + bulkImportReportId + "\" was not found!");
             return ResponseEntity.notFound().build();

src/main/java/eu/openaire/urls_controller/controllers/ShutdownController.java

@@ -60,7 +60,7 @@ public class ShutdownController {
             // A scheduler monitors the shutdown of the workers. Once all worker have shutdown, the Controller shuts down as well.
         }
 
-        return ResponseEntity.ok().body(endingMsg + "\n");
+        return ResponseEntity.ok().body(endingMsg + GenericUtils.endOfLine);
     }
 
 
@@ -87,7 +87,7 @@ public class ShutdownController {
                 logger.warn("Will not post CancelShutdownRequest to Worker \"" + workerId + "\", since is it has already shutdown.");
         }
 
-        return ResponseEntity.ok().body(endingMsg + "\n");
+        return ResponseEntity.ok().body(endingMsg + GenericUtils.endOfLine);
     }
 
 
@@ -98,7 +98,7 @@ public class ShutdownController {
         WorkerInfo workerInfo = UrlsController.workersInfoMap.get(workerId);
         if ( workerInfo == null ) {
             String errorMsg = "The worker with id \"" + workerId + "\" has not participated in the PDF-Aggregation-Service!";
-            logger.warn(initMsg + "\n" + errorMsg);
+            logger.warn(initMsg + GenericUtils.endOfLine + errorMsg);
             return ResponseEntity.badRequest().body(errorMsg);
         }
 

src/main/java/eu/openaire/urls_controller/services/BulkImportServiceImpl.java

@@ -103,7 +103,7 @@ public class BulkImportServiceImpl implements BulkImportService {
         }
 
         if ( logger.isTraceEnabled() )
-            logger.trace("fileLocations: " + additionalLoggingMsg + "\n" + fileLocations);
+            logger.trace("fileLocations: " + additionalLoggingMsg + GenericUtils.endOfLine + fileLocations);
 
         String localParquetDir = parquetFileUtils.parquetBaseLocalDirectoryPath + "bulk_import_" + provenance + File.separator + relativeBulkImportDir; // This ends with "/".
         try {
@@ -164,7 +164,7 @@ public class BulkImportServiceImpl implements BulkImportService {
                     // The failed-to-be-imported files, will not be deleted, even if the user specifies that he wants to delete the directory.
                 } catch (ExecutionException ee) {
                     String stackTraceMessage = GenericUtils.getSelectiveStackTrace(ee, null, 15);	// These can be serious errors like an "out of memory exception" (Java HEAP).
-                    logger.error("Task_" + (i+1) + " failed with: " + ee.getMessage() + additionalLoggingMsg + "\n" + stackTraceMessage);
+                    logger.error("Task_" + (i+1) + " failed with: " + ee.getMessage() + additionalLoggingMsg + GenericUtils.endOfLine + stackTraceMessage);
                 } catch (CancellationException ce) {
                     logger.error("Task_" + (i+1) + " was cancelled: " + ce.getMessage() + additionalLoggingMsg);
                 } catch (IndexOutOfBoundsException ioobe) {

src/main/java/eu/openaire/urls_controller/services/UrlsServiceImpl.java

@@ -6,6 +6,7 @@ import eu.openaire.urls_controller.controllers.UrlsController;
 import eu.openaire.urls_controller.models.*;
 import eu.openaire.urls_controller.payloads.responces.AssignmentsResponse;
 import eu.openaire.urls_controller.util.FileUtils;
+import eu.openaire.urls_controller.util.GenericUtils;
 import eu.openaire.urls_controller.util.ParquetFileUtils;
 import io.micrometer.core.annotation.Timed;
 import org.slf4j.Logger;
@@ -128,8 +129,8 @@ public class UrlsServiceImpl implements UrlsService {
             "           on existing.original_url=pu.url\n" +
             "   where d.allow_harvest=true\n" +
                     ((excludedDatasourceIDsStringList != null) ?    // If we have an exclusion-list, use it below.
-           ("       and d.id not in " + excludedDatasourceIDsStringList + "\n") : "") +
+           ("       and d.id not in " + excludedDatasourceIDsStringList + GenericUtils.endOfLine) : "") +
-            "       and coalesce(attempts.counts, 0) <= " + maxAttemptsPerRecordAtomic.get() + "\n" +
+            "       and coalesce(attempts.counts, 0) <= " + maxAttemptsPerRecordAtomic.get() + GenericUtils.endOfLine +
             "       and not exists (select 1 from " + DatabaseConnector.databaseName + ".attempt a where a.id=p.id and a.error_class = 'noRetry' limit 1)\n" +
             "       and pu.url != '' and pu.url is not null\n" +   // Some IDs have empty-string urls, there are no "null" urls, but keep the relevant check for future-proofing.
             "       and (p.year <= " + currentYear + " or p.year > " + (currentYear + 5) + ")\n" +  // Exclude the pubs which will be published in the next 5 years. They don't provide full-texts now. (We don't exclude all future pubs, since, some have invalid year, like "9999").
@@ -169,7 +170,7 @@ public class UrlsServiceImpl implements UrlsService {
                 assignment.setAssignmentsBatchCounter(curAssignmentsBatchCounter);
                 assignment.setTimestamp(timestamp);
                 Datasource datasource = new Datasource();
-                try {   // For each of the 4 columns returned, do the following. The column-indexing starts from  1
+                try {   // For each of the 4 columns returned, do the following. The column-indexing starts from 1.
                     assignment.setId(rs.getString(1));
                     assignment.setOriginalUrl(rs.getString(2));
                     datasource.setId(rs.getString(3));
@@ -186,7 +187,7 @@ public class UrlsServiceImpl implements UrlsService {
             errorMsg = "No results retrieved from the \"getAssignmentsQuery\" for worker with id: " + workerId + ". Will increase the \"maxAttempts\" to " + maxAttemptsPerRecordAtomic.incrementAndGet() + " for the next requests.";
             logger.error(errorMsg);
             if ( tmpErrMsg != null ) {
-                errorMsg += "\n" + tmpErrMsg;   // The additional error-msg is already logged.
+                errorMsg += GenericUtils.endOfLine + tmpErrMsg;   // The additional error-msg is already logged.
                 return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorMsg);
             } else
                 return ResponseEntity.status(HttpStatus.NO_CONTENT).body(new AssignmentsResponse((long) -1, null));
@@ -195,7 +196,7 @@ public class UrlsServiceImpl implements UrlsService {
             DatabaseConnector.databaseLock.unlock();
             errorMsg = DatabaseConnector.handleQueryException("getAssignmentsQuery", getAssignmentsQuery, e);
             if ( tmpErrMsg != null )
-                errorMsg += "\n" + tmpErrMsg;
+                errorMsg += GenericUtils.endOfLine + tmpErrMsg;
             return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorMsg);
         }
 
@@ -205,7 +206,7 @@ public class UrlsServiceImpl implements UrlsService {
             DatabaseConnector.databaseLock.unlock();
             errorMsg = "Some results were retrieved from the \"getAssignmentsQuery\", but no data could be extracted from them, for worker with id: " + workerId;
             if ( tmpErrMsg != null )
-                errorMsg += "\n" + tmpErrMsg;
+                errorMsg += GenericUtils.endOfLine + tmpErrMsg;
             logger.error(errorMsg);
             return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorMsg);
         }
@@ -225,7 +226,7 @@ public class UrlsServiceImpl implements UrlsService {
             DatabaseConnector.databaseLock.unlock();
             errorMsg = DatabaseConnector.handleQueryException("insertAssignmentsQuery", insertAssignmentsQuery, e);
             if ( tmpErrMsg != null )
-                errorMsg += "\n" + tmpErrMsg;
+                errorMsg += GenericUtils.endOfLine + tmpErrMsg;
             return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorMsg);
         }
 
@@ -440,7 +441,7 @@ public class UrlsServiceImpl implements UrlsService {
             String errorMsg = DatabaseConnector.handleQueryException("createCurrentAssignmentsQuery", createCurrentAssignmentsQuery, e);
             String tmpErrMsg = dropCurrentAssignmentTable();    // The table may be partially created, e.g. in case of an "out of memory" error in the database-server, during the creation, resulting in an empty table (yes it has happened).
             if ( tmpErrMsg != null )
-                errorMsg += "\n" + tmpErrMsg;
+                errorMsg += GenericUtils.endOfLine + tmpErrMsg;
             return errorMsg;
         }
 
@@ -450,7 +451,7 @@ public class UrlsServiceImpl implements UrlsService {
             String errorMsg = DatabaseConnector.handleQueryException("computeCurrentAssignmentsStatsQuery", computeCurrentAssignmentsStatsQuery, e);
             String tmpErrMsg = dropCurrentAssignmentTable();
             if ( tmpErrMsg != null )
-                errorMsg += "\n" + tmpErrMsg;
+                errorMsg += GenericUtils.endOfLine + tmpErrMsg;
             return errorMsg;
         }
 
@@ -546,7 +547,7 @@ public class UrlsServiceImpl implements UrlsService {
             logger.error("The Worker \"" + workerId + "\" failed to handle the \"postReportResultToWorker\", of assignments_" + assignmentRequestCounter + ": " + hsee.getMessage());
             return false;
         } catch (HttpClientErrorException hcee) {
-            logger.error("The Controller did something wrong when sending the report result to the Worker (" + workerId + "). | url: " + url + "\n" + hcee.getMessage());
+            logger.error("The Controller did something wrong when sending the report result to the Worker (" + workerId + "). | url: " + url + GenericUtils.endOfLine + hcee.getMessage());
             return false;
         } catch (Exception e) {
             errorMsg = "Error for \"postReportResultToWorker\", of assignments_" + assignmentRequestCounter + " to the Worker: " + workerId;
@@ -578,7 +579,7 @@ public class UrlsServiceImpl implements UrlsService {
             }
             // Only if the file exists, proceed to renaming it.
             renamedWorkerReport = new File(workerReportBaseName + ((errorMsg == null) ? "_successful.json" : "_failed.json"));
-            if ( !workerReport.renameTo(renamedWorkerReport) ) {
+            if ( ! workerReport.renameTo(renamedWorkerReport) ) {
                 logger.warn("There was a problem when renaming the workerReport: " + workerReport.getName());
                 return null;
             }

src/main/java/eu/openaire/urls_controller/util/FileUtils.java

@@ -10,6 +10,7 @@ import eu.openaire.urls_controller.models.Payload;
 import eu.openaire.urls_controller.models.UrlReport;
 import eu.openaire.urls_controller.models.WorkerInfo;
 import org.apache.commons.io.FileDeleteStrategy;
+import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -352,7 +353,7 @@ public class FileUtils {
                 curBatchPath = Files.createDirectories(Paths.get(targetDirectory));
                 // The base-directory will be created along with the first batch-directory.
             } catch (Exception e) {
-                logger.error("Could not create the \"curBatchPath\" directory: " + targetDirectory + "\n" + e.getMessage(), e);   // It shows the response body (after Spring v.2.5.6).
+                logger.error("Could not create the \"curBatchPath\" directory: " + targetDirectory + GenericUtils.endOfLine + e.getMessage(), e);   // It shows the response body (after Spring v.2.5.6).
                 failedBatches ++;
                 continue;
             }
@@ -433,7 +434,7 @@ public class FileUtils {
             uploadFullTexts(extractedFileNames, targetDirectory, allFileNamesWithPayloads);
             return true;
         } catch (Exception e) {
-            logger.error("Could not extract and upload the full-texts for batch_" + batchCounter + " of assignments_" + assignmentsBatchCounter + "\n" + e.getMessage(), e);   // It shows the response body (after Spring v.2.5.6).
+            logger.error("Could not extract and upload the full-texts for batch_" + batchCounter + " of assignments_" + assignmentsBatchCounter + GenericUtils.endOfLine + e.getMessage(), e);   // It shows the response body (after Spring v.2.5.6).
             return false;
         } finally {
             deleteDirectory(curBatchPath.toFile());
@@ -450,6 +451,26 @@ public class FileUtils {
             HttpURLConnection conn = (HttpURLConnection) new URL(requestUrl).openConnection();
             conn.setRequestMethod("GET");
             conn.setRequestProperty("User-Agent", "UrlsController");
+
+            // TODO - Write the fileNames in the RequestBody, so that we can include as many as we want in each request.
+            // Right now, we can include only up to 70-80 fileNames in the url-string.
+            // TODO - We need to add the fileNames in the requestBody BEFORE we connect. So we will need to refactor the code to work in that order.
+            /*OutputStream os = conn.getOutputStream();
+            OutputStreamWriter osw = new OutputStreamWriter(os, StandardCharsets.UTF_8);
+            osw.write(fileNamesForCurBatch_separated_by_comma);
+            osw.flush();
+            osw.close();
+            os.close();*/
+
+
+            // TODO - The above update will also enable is to improve edge-case management like making sure we do not create a whole new batch for just a few files..
+            // Check this case for example, where we have one extra batch with the network, compression-decompression, transfer, uploading ect overhead:
+            // 2023-02-06 12:17:26.893 [http-nio-1880-exec-8] DEBUG e.o.urls_controller.util.FileUtils.getAndUploadFullTexts(@235) - The assignments_12 have 211 distinct non-already-uploaded fullTexts.
+            // Going to request them from the Worker "worker_X", in 4 batches (70 files each, except for the final batch, which will have 1 files).
+
+            // If we are not limited by the url-length we can easily say that if less than 10 files remain for the last batch, then add them to the previous batch (eg. the last batch will have 79 files)
+            // If equal to 10 or more files remain, then we will make an extra batch.
+
             conn.connect();
             int statusCode = conn.getResponseCode();
             if ( statusCode == -1 ) {   //  Invalid HTTP-Response.
@@ -466,7 +487,7 @@ public class FileUtils {
             throw re;
         } catch (Exception e) {
             String exMessage = e.getMessage();
-            logger.warn("Problem when requesting the ZstdFile of batch_" + batchNum + " of assignments_" + assignmentsBatchCounter + " from the Worker with ID \"" + workerId + "\" and requestUrl: " + requestUrl + "\n" + exMessage);
+            logger.warn("Problem when requesting the ZstdFile of batch_" + batchNum + " of assignments_" + assignmentsBatchCounter + " from the Worker with ID \"" + workerId + "\" and requestUrl: " + requestUrl + GenericUtils.endOfLine + exMessage);
             if ( exMessage.contains("Connection refused") ) {
                 logger.error("Since we received a \"Connection refused\", from \"" + workerId + "\", all of the remaining batches (" + (totalBatches - batchNum) + ") will not be requested!");
                 throw new RuntimeException();
@@ -600,7 +621,8 @@ public class FileUtils {
     }
 
 
-    public String getMessageFromResponseBody(HttpURLConnection conn, boolean isError) {
+    public String getMessageFromResponseBody(HttpURLConnection conn, boolean isError)
+    {
         final StringBuilder msgStrB = new StringBuilder(500);
         try ( BufferedReader br = new BufferedReader(new InputStreamReader((isError ? conn.getErrorStream() : conn.getInputStream()))) ) {
             String inputLine;
@@ -620,7 +642,8 @@ public class FileUtils {
     }
 
 
-    private List<String> getFileNamesForBatch(List<String> allFileNames, int numAllFullTexts, int curBatch) {
+    private List<String> getFileNamesForBatch(List<String> allFileNames, int numAllFullTexts, int curBatch)
+    {
         int initialIndex = ((curBatch-1) * numOfFullTextsPerBatch);
         int endingIndex = (curBatch * numOfFullTextsPerBatch);
         if ( endingIndex > numAllFullTexts )    // This might be the case, when the "numAllFullTexts" is too small.
@@ -631,14 +654,15 @@ public class FileUtils {
             try {
                 fileNamesOfCurBatch.add(allFileNames.get(i));
             } catch (IndexOutOfBoundsException ioobe) {
-                logger.error("IOOBE for i=" + i + "\n" + ioobe.getMessage(), ioobe);
+                logger.error("IOOBE for i=" + i + GenericUtils.endOfLine + ioobe.getMessage(), ioobe);
             }
         }
         return fileNamesOfCurBatch;
     }
 
 
-    private String getRequestUrlForBatch(String baseUrl, List<String> fileNamesForCurBatch) {
+    private String getRequestUrlForBatch(String baseUrl, List<String> fileNamesForCurBatch)
+    {
         final StringBuilder sb = new StringBuilder(numOfFullTextsPerBatch * 50);
         sb.append(baseUrl);
         int numFullTextsCurBatch = fileNamesForCurBatch.size();
@@ -679,7 +703,8 @@ public class FileUtils {
      * @param urlReports
      * @param shouldCheckAndKeepS3UploadedFiles
      */
-    public void updateUrlReportsToHaveNoFullTextFiles(List<UrlReport> urlReports, boolean shouldCheckAndKeepS3UploadedFiles) {
+    public void updateUrlReportsToHaveNoFullTextFiles(List<UrlReport> urlReports, boolean shouldCheckAndKeepS3UploadedFiles)
+    {
         for ( UrlReport urlReport : urlReports ) {
             Payload payload = urlReport.getPayload();
             if ( payload == null )

src/main/java/eu/openaire/urls_controller/util/GenericUtils.java

@@ -6,8 +6,12 @@ import java.util.Date;
 
 public class GenericUtils {
 
+
+    public static final String endOfLine = "\n";
+
     private static final SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS z");
 
+
     public static String getReadableCurrentTimeAndZone() {
         return (simpleDateFormat.format(new Date(System.currentTimeMillis())));
     }
@@ -23,10 +27,10 @@ public class GenericUtils {
         StackTraceElement[] stels = thr.getStackTrace();
         StringBuilder sb = new StringBuilder(numOfLines *100);
         if ( initialMessage != null )
-            sb.append(initialMessage).append(" Stacktrace:").append("\n");	// This StringBuilder is thread-safe as a local-variable.
+            sb.append(initialMessage).append(" Stacktrace:").append(GenericUtils.endOfLine);	// This StringBuilder is thread-safe as a local-variable.
         for ( int i = 0; (i < stels.length) && (i <= numOfLines); ++i ) {
             sb.append(stels[i]);
-            if (i < numOfLines) sb.append("\n");
+            if (i < numOfLines) sb.append(GenericUtils.endOfLine);
         }
         return sb.toString();
     }

src/main/java/eu/openaire/urls_controller/util/ParquetFileUtils.java

@@ -240,7 +240,7 @@ public class ParquetFileUtils {
         for ( UrlReport urlReport : urlReports ) {
             Payload payload = urlReport.getPayload();
             if ( payload == null ) {
-                logger.warn("Payload was \"null\" for a \"urlReport\", in assignments_" + curReportAssignmentsCounter + "\n" + urlReport);
+                logger.warn("Payload was \"null\" for a \"urlReport\", in assignments_" + curReportAssignmentsCounter + GenericUtils.endOfLine + urlReport);
                 continue;
             }
 
@@ -289,7 +289,7 @@ public class ParquetFileUtils {
     }
 
 
-    public boolean createAndLoadParquetDataIntoPayloadTable(List<UrlReport> urlReports, long curReportAssignmentsCounter, String localParquetPath, String parquetHDFSDirectoryPathPayloads)
+    public boolean createAndLoadParquetDataIntoPayloadTable(int payloadsCounter, List<UrlReport> urlReports, long curReportAssignmentsCounter, String localParquetPath, String parquetHDFSDirectoryPathPayloads)
     {
         List<GenericData.Record> recordList = new ArrayList<>((int) (urlReports.size() * 0.2));
         GenericData.Record record;
@@ -298,7 +298,7 @@ public class ParquetFileUtils {
         {
             Payload payload = urlReport.getPayload();
             if ( payload == null ) {
-                logger.warn("Payload was \"null\" for a \"urlReport\", in assignments_" + curReportAssignmentsCounter + "\n" + urlReport);
+                logger.warn("Payload was \"null\" for a \"urlReport\", in assignments_" + curReportAssignmentsCounter + GenericUtils.endOfLine + urlReport);
                 continue;
             }
 
@@ -331,7 +331,7 @@ public class ParquetFileUtils {
             return false;
         }
 
-        String fileName = curReportAssignmentsCounter + "_payloads.parquet";
+        String fileName = curReportAssignmentsCounter + "_payloads_" + payloadsCounter + ".parquet";
         //logger.trace("Going to write " + recordsSize + " payload-records to the parquet file: " + fileName);    // DEBUG!
 
         String fullFilePath = localParquetPath + fileName;
@@ -374,7 +374,7 @@ public class ParquetFileUtils {
         } catch (Throwable e) { // The simple "Exception" may not be thrown here, but an "Error" may be thrown. "Throwable" catches EVERYTHING!
             String errorMsg = "Problem when creating the \"ParquetWriter\" object or when writing the records with it!";
             if ( e instanceof org.apache.hadoop.fs.FileAlreadyExistsException )
-                logger.error(errorMsg + "\n" + e.getMessage());
+                logger.error(errorMsg + GenericUtils.endOfLine + e.getMessage());
             else
                 logger.error(errorMsg, e);
 
@@ -645,7 +645,7 @@ public class ParquetFileUtils {
                 return false;
             }
             if ( logger.isTraceEnabled() )
-                logger.trace("The Operation was successful for hdfs-op-url: " + hdfsOperationUrl + "\n" + fileUtils.getMessageFromResponseBody(conn, false));
+                logger.trace("The Operation was successful for hdfs-op-url: " + hdfsOperationUrl + GenericUtils.endOfLine + fileUtils.getMessageFromResponseBody(conn, false));
         } catch (Exception e) {
             logger.error("", e);
             return false;