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

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: streams
• Labels: newbie++
• Assignee: Guozhang Wang
• Reporter: Guozhang Wang
• Created: 03/Aug/17 22:43
• Updated: 07/Sep/17 22:30
• Resolved: 07/Sep/17 21:37

Description

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:

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

While ideally we want:

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

Issue Links

• links to: GitHub Pull Request #3618