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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GEARPUMP-349) Graph#topologicalOrderIterator is slow for large graph
Date Tue, 05 Sep 2017 23:24:00 GMT

    [ https://issues.apache.org/jira/browse/GEARPUMP-349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16154554#comment-16154554
] 

ASF GitHub Bot commented on GEARPUMP-349:
-----------------------------------------

Github user manuzhang commented on the issue:

    https://github.com/apache/incubator-gearpump/pull/223
  
    @huafengw could you explain a bit why it's faster now.


> Graph#topologicalOrderIterator is slow for large graph
> ------------------------------------------------------
>
>                 Key: GEARPUMP-349
>                 URL: https://issues.apache.org/jira/browse/GEARPUMP-349
>             Project: Apache Gearpump
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 0.8.4
>            Reporter: Manu Zhang
>            Assignee: Huafeng Wang
>             Fix For: 0.8.5
>
>
> The algorithm is as follows
> 1. find zero in-degree nodes from a copied graph. 
> 2. remove nodes from the copied graph and add them to the output
> 3. repeat 1
> The issue is that step 1 traverses all remaining nodes each time, which costs the algorithm
{{O(n^2)}} time
> {{Graph#hasCycle}} has a similar issue



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