lukasz-antoniak commented on code in PR #239:
URL: 
https://github.com/apache/cassandra-analytics/pull/239#discussion_r3911834501


##########
cassandra-analytics-core/src/main/java/org/apache/cassandra/spark/bulkwriter/DirectStreamSession.java:
##########
@@ -182,57 +171,59 @@ protected void sendRemainingSSTables()
         }
     }
 
-    private void sendSStableToReplicas(Path dataFile)
+    private void sendSStableToReplicas(SortedSSTableWriter.PreparedSSTable 
preparedSSTable)
     {
         int ssTableIdx = nextSSTableIdx.getAndIncrement();
 
         LOGGER.info("[{}]: Pushing SSTable {} to replicas {}",
-                    sessionID, dataFile,
+                    sessionID, preparedSSTable.dataFile(),
                     
replicas.stream().map(RingInstance::nodeName).collect(Collectors.joining(",")));
-        replicas.removeIf(replica -> !trySendSSTableToOneReplica(dataFile, 
ssTableIdx, replica, sstableWriter.fileDigestMap()));
+        replicas.removeIf(replica -> 
!trySendSSTableToOneReplica(preparedSSTable, ssTableIdx, replica));
     }
 
-    private boolean trySendSSTableToOneReplica(Path dataFile,
+    private boolean 
trySendSSTableToOneReplica(SortedSSTableWriter.PreparedSSTable preparedSSTable,
                                                int ssTableIdx,
-                                               RingInstance replica,
-                                               Map<Path, Digest> fileDigests)
+                                               RingInstance replica)
     {
         try
         {
-            sendSSTableToOneReplica(dataFile, ssTableIdx, replica, 
fileDigests);
+            sendSSTableToOneReplica(preparedSSTable, ssTableIdx, replica);
             return true;
         }
         catch (Exception exception)
         {
             LOGGER.error("[{}]: Failed to stream range {} to instance {}",
                          sessionID, tokenRange, replica.nodeName(), exception);
             writerContext.cluster().refreshClusterInfo();
-            failureHandler.addFailure(this.tokenRange, replica, 
exception.getMessage());
-            errors.add(new StreamError(this.tokenRange, replica, 
exception.getMessage()));
+            // Sometimes error can contain just file name (e.g. when it is 
missing).
+            // Let us return 3 latest stacktrace lines for easier 
troubleshooting.
+            String stackTrace = Arrays.stream(exception.getStackTrace())
+                                      .limit(3)
+                                      .map(StackTraceElement::toString)
+                                      .collect(Collectors.joining("\n"));
+            String errorMessage = exception.getClass().getName() + ": " + 
exception.getMessage()
+                                  + "\n" + String.join("\n", stackTrace);
+            failureHandler.addFailure(this.tokenRange, replica, errorMessage);
+            errors.add(new StreamError(this.tokenRange, replica, 
errorMessage));
             clean(replica, sessionID);
             return false;
         }
     }
 
-    private void sendSSTableToOneReplica(Path dataFile,
+    private void sendSSTableToOneReplica(SortedSSTableWriter.PreparedSSTable 
preparedSSTable,
                                          int ssTableIdx,
-                                         RingInstance instance,
-                                         Map<Path, Digest> fileHashes) throws 
IOException
+                                         RingInstance instance) throws 
IOException
     {
-        try (DirectoryStream<Path> componentFileStream = 
Files.newDirectoryStream(dataFile.getParent(),
-                                                                               
   SSTables.getSSTableBaseName(dataFile) + "*"))
+        for (Path componentFile : preparedSSTable.files())
         {
-            for (Path componentFile : componentFileStream)
+            // send data component the last
+            if (preparedSSTable.dataFile().equals(componentFile))

Review Comment:
   Theoretically it could, but only if data file was not generated during 
sstable creation (e.g. `remainingSSTablesAfterClose` contained some sstable 
files, but without `Data.db`). I have replaced the operands in equality check, 
and added preconditions check.



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