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https://issues.apache.org/jira/browse/FLINK-2090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14559083#comment-14559083
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Stephan Ewen commented on FLINK-2090:
-------------------------------------
How about we print at most N (= 3 or 10) elements. After each element, we check
whether the string buffer has more than 100 characters. If yes, we abort there.
> toString of CollectionInputFormat takes long time when the collection is huge
> -----------------------------------------------------------------------------
>
> Key: FLINK-2090
> URL: https://issues.apache.org/jira/browse/FLINK-2090
> Project: Flink
> Issue Type: Improvement
> Reporter: Till Rohrmann
> Priority: Minor
>
> The {{toString}} method of {{CollectionInputFormat}} calls {{toString}} on
> its underlying {{Collection}}. Thus, {{toString}} is called for each element
> of the collection. If the {{Collection}} contains many elements or the
> individual {{toString}} calls for each element take a long time, then the
> string generation can take a considerable amount of time. [~mikiobraun]
> noticed that when he inserted several jBLAS matrices into Flink.
> The {{toString}} method is mainly used for logging statements in
> {{DataSourceNode}}'s {{computeOperatorSpecificDefaultEstimates}} method and
> in {{JobGraphGenerator.getDescriptionForUserCode}}. I'm wondering whether it
> is necessary to print the complete content of the underlying {{Collection}}
> or if it's not enough to print only the first 3 elements in the {{toString}}
> method.
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