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https://issues.apache.org/jira/browse/SPARK-25237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592502#comment-16592502
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Apache Spark commented on SPARK-25237:
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User 'dujunling' has created a pull request for this issue:
https://github.com/apache/spark/pull/22232
> FileScanRdd's inputMetrics is wrong when select the datasource table with
> limit
> --------------------------------------------------------------------------------
>
> Key: SPARK-25237
> URL: https://issues.apache.org/jira/browse/SPARK-25237
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.2, 2.3.1
> Reporter: du
> Priority: Major
>
> In FileScanRdd, we will update inputMetrics's bytesRead using updateBytesRead
> every 1000 rows or when close the iterator.
> but when close the iterator, we will invoke updateBytesReadWithFileSize to
> increase the inputMetrics's bytesRead with file's length.
> this will result in the inputMetrics's bytesRead is wrong when run the query
> with limit such as select * from table limit 1。
> because we do not support for Hadoop 2.5 and earlier now, we always get the
> bytesRead from Hadoop FileSystem statistics other than files's length.
>
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