[jira] [Commented] (SPARK-3121) Wrong implementation of implicit bytesWritableConverter

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163523#comment-14163523 ] 

Apache Spark commented on SPARK-3121:
-------------------------------------

User 'james64' has created a pull request for this issue:
https://github.com/apache/spark/pull/2712

> Wrong implementation of implicit bytesWritableConverter
> -------------------------------------------------------
>
>                 Key: SPARK-3121
>                 URL: https://issues.apache.org/jira/browse/SPARK-3121
>             Project: Spark
>          Issue Type: Bug
>    Affects Versions: 1.0.2
>            Reporter: Jakub Dubovsky
>            Priority: Minor
>
> val path = ... //path to seq file with BytesWritable as type of both key and value
> val file = sc.sequenceFile[Array[Byte],Array[Byte]](path)
> file.take(1)(0)._1
> This prints incorrect content of byte array. Actual content starts with correct one and some "random" bytes and zeros are appended. BytesWritable has two methods:
> getBytes() - return content of all internal array which is often longer then actual value stored. It usually contains the rest of previous longer values
> copyBytes() - return just begining of internal array determined by internal length property
> It looks like in implicit conversion between BytesWritable and Array[byte] getBytes is used instead of correct copyBytes.



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