flink-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andra Lungu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-2361) flatMap + distinct gives eroneous results for big data sets
Date Tue, 14 Jul 2015 21:32:04 GMT

     [ https://issues.apache.org/jira/browse/FLINK-2361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andra Lungu updated FLINK-2361:
-------------------------------
    Summary: flatMap + distinct gives eroneous results for big data sets  (was: flatMap +
distict gives eroneous results for big data sets)

> flatMap + distinct gives eroneous results for big data sets
> -----------------------------------------------------------
>
>                 Key: FLINK-2361
>                 URL: https://issues.apache.org/jira/browse/FLINK-2361
>             Project: Flink
>          Issue Type: Bug
>          Components: Gelly
>    Affects Versions: 0.10
>            Reporter: Andra Lungu
>
> When running the simple Connected Components algorithm (currently in Gelly) on the twitter
follower graph, with 1, 100 or 10000 iterations, I get the following error:
> Caused by: java.lang.Exception: Target vertex '657282846' does not exist!.
> 	at org.apache.flink.graph.spargel.VertexCentricIteration$VertexUpdateUdfSimpleVV.coGroup(VertexCentricIteration.java:300)
> 	at org.apache.flink.runtime.operators.CoGroupWithSolutionSetSecondDriver.run(CoGroupWithSolutionSetSecondDriver.java:220)
> 	at org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:496)
> 	at org.apache.flink.runtime.iterative.task.AbstractIterativePactTask.run(AbstractIterativePactTask.java:139)
> 	at org.apache.flink.runtime.iterative.task.IterationTailPactTask.run(IterationTailPactTask.java:107)
> 	at org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:362)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
> 	at java.lang.Thread.run(Thread.java:722)
> Now this is very bizzare as the DataSet of vertices is produced from the DataSet of edges...
Which means there cannot be a an edge with an invalid target id... The method calls flatMap
to isolate the src and trg ids and distinct to ensure their uniqueness.  
> The algorithm works fine for smaller data sets... 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message