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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-25237) FileScanRdd's inputMetrics is wrong when select the datasource table with limit
Date Tue, 04 Sep 2018 02:08:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-25237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602543#comment-16602543
] 

Apache Spark commented on SPARK-25237:
--------------------------------------

User 'maropu' has created a pull request for this issue:
https://github.com/apache/spark/pull/22324

> 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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