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https://issues.apache.org/jira/browse/SPARK-14273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220155#comment-15220155
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Yin Huai commented on SPARK-14273:
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I also chatted [~marmbrus] about it. One thought is that if we want to
implement non-splitable format based on the new FileFormat interface. It will
be good to have some cases before we start to work on it.
> Add FileFormat.isSplittable to indicate whether a format is splittable
> ----------------------------------------------------------------------
>
> Key: SPARK-14273
> URL: https://issues.apache.org/jira/browse/SPARK-14273
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Cheng Lian
>
> {{FileSourceStrategy}} assumes that all data source formats are splittable
> and always splits data files by fixed partition size. However, not all HDSF
> based formats are splittable. We need a flag to indicate that and ensure that
> non-splittable files won't be split into multiple Spark partitions.
> (PS: Is it "splitable" or "splittable"? Probably the latter one? Hadoop uses
> the former one though...)
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