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https://issues.apache.org/jira/browse/SPARK-14524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234761#comment-15234761
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Deng Changchun commented on SPARK-14524:
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Thank you, after modifying UTF8String referring
https://github.com/apache/spark/pull/9704/files, this bug cannot be reproeuced.
So I think it was resolved.
> In SparkSQL, it can't be select column of String type because of UTF8String
> when setting more than 32G for executors.
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-14524
> URL: https://issues.apache.org/jira/browse/SPARK-14524
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.2
> Environment: Centos
> Reporter: Deng Changchun
> Assignee: Davies Liu
> Priority: Critical
> Labels: UTF8String
>
> (related Issue:https://github.com/apache/spark/pull/8210/files)
> When we set 32G(or more) for executor, select the column of String type, it
> shows the Wrong result, such as:
> 'abcde' (less than 8 chars) => '' (it will show nothing)
> 'abcdefghijklmn' (more than 8 chars) =>'ijklmn' ( it will cut the the front
> of 8 chars)
> However, when we set 31G( or less) for executor, all is good.
> We also have debugged this problem, we found that SparkSQL uses UTF8String
> internally, it depends on some properties of locally JVM Memmory allocation (
> see class 'org.apache.spark.unsafe.Platform').
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