[GitHub] [druid] FrankChen021 commented on a change in pull request #11723: Improve exception message when loading data from web-console

[GitBox <gi...@apache.org>]

FrankChen021 commented on a change in pull request #11723:
URL: https://github.com/apache/druid/pull/11723#discussion_r730412089



##########
File path: indexing-service/src/main/java/org/apache/druid/indexing/overlord/sampler/SamplerExceptionMapper.java
##########
@@ -28,13 +29,21 @@
 @Provider
 public class SamplerExceptionMapper implements ExceptionMapper<SamplerException>
 {
+  private static final Logger LOG = new Logger(SamplerExceptionMapper.class);
+
   @Override
   public Response toResponse(SamplerException exception)
   {
+    String message = exception.getMessage() == null ? "The sampler encountered an issue" : exception.getMessage();
+
+    // stack trace is not returned to the client,
+    // so the cause of the exception should be logged so that we know where the exception is thrown
+    LOG.error(exception.getCause(), message);

Review comment:
       fixed. 

##########
File path: indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/SeekableStreamSamplerSpec.java
##########
@@ -92,9 +93,22 @@ public SamplerResponse sample()
       );
       inputFormat = null;
     } else {
+      RecordSupplier<PartitionIdType, SequenceOffsetType, RecordType> recordSupplier;
+
+      try {
+        recordSupplier = createRecordSupplier();
+      }
+      catch (Exception e) {
+        if (e.getCause() != null) {
+          throw new SamplerException(e, "Unable to sample data: %s. Cause: %s", e.getMessage(), e.getCause().getMessage());

Review comment:
       fixed




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