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

["Jakub Dubovsky (JIRA)" <ji...@apache.org>]

Jakub Dubovsky created SPARK-3121:
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             Summary: 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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