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From "antonkulaga (JIRA)" <>
Subject [jira] [Created] (SPARK-28547) Make it work for wide (> 10K columns data)
Date Sun, 28 Jul 2019 09:24:00 GMT
antonkulaga created SPARK-28547:

             Summary: Make it work for wide (> 10K columns data)
                 Key: SPARK-28547
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.4.3, 2.4.4
         Environment: Ubuntu server, Spark 2.4.3 Scala with >64GB RAM per node, 32 cores
(tried different configurations of executors)
            Reporter: antonkulaga

Spark is super-slow for all wide data (when there are >15kb columns and >15kb rows).
Most of the genomics/transcriptomic data is wide because number of genes is usually >20kb
and number of samples ass well. Very popular GTEX dataset is a good example ( see for instance
RNA-Seq data at where gct is
just a .tsv file with two comments in the beginning). Everything done in wide tables either
takes ours or gets frozen (because of lost executors) irrespective of memory and numbers of
cores. While the same operations work well with pure pandas (without any spark involved).

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