Examples of cascading.flow.planner.ElementGraphException

cascading.flow.planner.ElementGraphException
Class ElementGraphException is thrown during rendering of a pipe assembly to the Cascading internal "graph" representation.

        flowElement = iterator.next();
        }
      catch( IllegalArgumentException exception )
        {
        if( flowElement == null )
          throw new ElementGraphException( "unable to traverse to the first element" );


        throw new ElementGraphException( flowElement, "unable to traverse to the next element after " + flowElement );
        }


      if( requireUniqueCheckpoints && flowElement instanceof Checkpoint )
        {
        String name = ( (Checkpoint) flowElement ).getName();


        if( checkpointNames.contains( name ) )
          throw new ElementGraphException( (Pipe) flowElement, "may not have duplicate checkpoint names in assembly, found: " + name );


        checkpointNames.add( name );
        }


      if( incomingEdgesOf( flowElement ).size() != 0 && outgoingEdgesOf( flowElement ).size() != 0 )
        continue;


      if( flowElement instanceof Extent )
        continue;


      if( flowElement instanceof Pipe )
        {
        if( incomingEdgesOf( flowElement ).size() == 0 )
          throw new ElementGraphException( (Pipe) flowElement, "no Tap connected to head Pipe: " + flowElement + ", possible ambiguous branching, try explicitly naming tails" );
        else
          throw new ElementGraphException( (Pipe) flowElement, "no Tap connected to tail Pipe: " + flowElement + ", possible ambiguous branching, try explicitly naming tails" );
        }


      if( flowElement instanceof Tap )
        throw new ElementGraphException( (Tap) flowElement, "no Pipe connected to Tap: " + flowElement );
      else
        throw new ElementGraphException( flowElement, "unknown element type: " + flowElement );
      }
    }

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        {
        scope = addEdge( sinks.get( sink ), Extent.tail );
        }
      catch( IllegalArgumentException exception )
        {
        throw new ElementGraphException( "missing pipe for sink tap: [" + sink + "]" );
        }


      if( scope == null )
        throw new ElementGraphException( "cannot sink to the same path from multiple branches: [" + Util.join( sinks.values() ) + "]" );


      scope.setName( sink );
      }
    }

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      makeGraph( previous, sources, sinks );


      LOG.debug( "adding edge: {} -> ", previous, current );


      if( getEdge( previous, current ) != null )
        throw new ElementGraphException( previous, "cannot distinguish pipe branches, give pipe unique name: " + previous );


      Scope scope = addEdge( previous, current );


      scope.setName( previous.getName() ); // name scope after previous pipe

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Related Classes of cascading.flow.planner.ElementGraphException

cascading.flow.planner.graph.FlowElementGraph

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