[jira] [Created] (FLINK-2090) toString of CollectionInputFormat takes long time when the collection is huge

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-2090:
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             Summary: 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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