[jira] [Created] (KAFKA-5698) Sort processor node based on name suffix in TopologyDescription.toString()

[Guozhang Wang (JIRA)]

Guozhang Wang created KAFKA-5698:
------------------------------------

             Summary: Sort processor node based on name suffix in 
TopologyDescription.toString()
                 Key: KAFKA-5698
                 URL: https://issues.apache.org/jira/browse/KAFKA-5698
             Project: Kafka
          Issue Type: Bug
          Components: streams
            Reporter: Guozhang Wang


Today when we print the topology via the {{Topology#describe()#toString}}, the 
processor nodes are not sorted inside the {{TopologyDescription.toString()}} 
function. For example, for the word count demo topology we get:

{code}
Sub-topologies: 
  Sub-topology: 0
    Processor: KSTREAM-FILTER-0000000005(stores: []) --> 
KSTREAM-SINK-0000000004 <-- KSTREAM-MAP-0000000002
    Source: KSTREAM-SOURCE-0000000000(topics: streams-wordcount-input) --> 
KSTREAM-FLATMAPVALUES-0000000001
    Processor: KSTREAM-FLATMAPVALUES-0000000001(stores: []) --> 
KSTREAM-MAP-0000000002 <-- KSTREAM-SOURCE-0000000000
    Processor: KSTREAM-MAP-0000000002(stores: []) --> KSTREAM-FILTER-0000000005 
<-- KSTREAM-FLATMAPVALUES-0000000001
    Sink: KSTREAM-SINK-0000000004(topic: Counts-repartition) <-- 
KSTREAM-FILTER-0000000005


  Sub-topology: 1
    Source: KSTREAM-SOURCE-0000000006(topics: Counts-repartition) --> 
KSTREAM-AGGREGATE-0000000003
    Sink: KSTREAM-SINK-0000000008(topic: streams-wordcount-output) <-- 
KTABLE-TOSTREAM-0000000007
    Processor: KTABLE-TOSTREAM-0000000007(stores: []) --> 
KSTREAM-SINK-0000000008 <-- KSTREAM-AGGREGATE-0000000003
    Processor: KSTREAM-AGGREGATE-0000000003(stores: [Counts]) --> 
KTABLE-TOSTREAM-0000000007 <-- KSTREAM-SOURCE-0000000006
{code}

While ideally we want:

{code}
Sub-topologies: 
  Sub-topology: 0
    Source: KSTREAM-SOURCE-0000000000(topics: streams-wordcount-input) --> 
KSTREAM-FLATMAPVALUES-0000000001
    Processor: KSTREAM-FLATMAPVALUES-0000000001(stores: []) --> 
KSTREAM-MAP-0000000002 <-- KSTREAM-SOURCE-0000000000
    Processor: KSTREAM-MAP-0000000002(stores: []) --> KSTREAM-FILTER-0000000005 
<-- KSTREAM-FLATMAPVALUES-0000000001
    Processor: KSTREAM-FILTER-0000000005(stores: []) --> 
KSTREAM-SINK-0000000004 <-- KSTREAM-MAP-0000000002
    Sink: KSTREAM-SINK-0000000004(topic: Counts-repartition) <-- 
KSTREAM-FILTER-0000000005

  Sub-topology: 1
    Source: KSTREAM-SOURCE-0000000006(topics: Counts-repartition) --> 
KSTREAM-AGGREGATE-0000000003
    Processor: KSTREAM-AGGREGATE-0000000003(stores: [Counts]) --> 
KTABLE-TOSTREAM-0000000007 <-- KSTREAM-SOURCE-0000000006
    Processor: KTABLE-TOSTREAM-0000000007(stores: []) --> 
KSTREAM-SINK-0000000008 <-- KSTREAM-AGGREGATE-0000000003
    Sink: KSTREAM-SINK-0000000008(topic: streams-wordcount-output) <-- 
KTABLE-TOSTREAM-0000000007
{code}





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