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Posted to issues@hop.apache.org by "CarlosJuncher03 (via GitHub)" <gi...@apache.org> on 2026/07/01 21:46:35 UTC

[I] [Bug]: Pipeline hangs when chaining steps that perform grouping/join/lookup and may duplicate rows, requiring an intermediate wait/blocking step (hop)

CarlosJuncher03 opened a new issue, #7395:
URL: https://github.com/apache/hop/issues/7395

   ### Apache Hop version?
   
   2.19
   
   ### Java version?
   
   21
   
   ### Operating system
   
   Windows
   
   ### What happened?
   
   I have identified a possible issue in Apache Hop pipelines where steps that perform grouping, join, or lookup operations are executed in sequence, especially when one of these steps may generate duplicate rows.
   
   In certain combinations of steps, the pipeline hangs and does not finish processing, even though no explicit error is shown. The issue stops occurring when I add an intermediate wait/blocking step, such as Blocking step, between the affected steps
   
   <img width="811" height="407" alt="Image" src="https://github.com/user-attachments/assets/c3e1b641-1a32-4102-92bb-bf6eeebf28f2" />
   
   ### Issue Priority
   
   Priority: 3
   
   ### Issue Component
   
   Component: Transforms


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Re: [I] [Bug]: Pipeline hangs when chaining steps that perform grouping/join/lookup and may duplicate rows, requiring an intermediate wait/blocking step (hop)

Posted by "hansva (via GitHub)" <gi...@apache.org>.
hansva commented on issue #7395:
URL: https://github.com/apache/hop/issues/7395#issuecomment-4862585875

   This is not a bug and is explained in the [documentation](https://hop.apache.org/manual/latest/how-to-guides/avoiding-deadlocks.html)


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Re: [I] [Bug]: Pipeline hangs when chaining steps that perform grouping/join/lookup and may duplicate rows, requiring an intermediate wait/blocking step (hop)

Posted by "hansva (via GitHub)" <gi...@apache.org>.
hansva closed issue #7395: [Bug]: Pipeline hangs when chaining steps that perform grouping/join/lookup and may duplicate rows, requiring an intermediate wait/blocking step
URL: https://github.com/apache/hop/issues/7395


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