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https://issues.apache.org/jira/browse/SPARK-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-9517:
-----------------------------------
Assignee: Apache Spark (was: Reynold Xin)
> BytesToBytesMap should encode data the same way as UnsafeExternalSorter
> -----------------------------------------------------------------------
>
> Key: SPARK-9517
> URL: https://issues.apache.org/jira/browse/SPARK-9517
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Apache Spark
>
> BytesToBytesMap current encodes key/value data in the following format:
> {code}
> 8B key length, key data, 8B value length, value data
> {code}
> UnsafeExternalSorter, on the other hand, encodes data this way:
> {code}
> 4B record length, data
> {code}
> As a result, we cannot pass records encoded by BytesToBytesMap directly into
> UnsafeExternalSorter for sorting. However, if we rearrange data slightly, we
> can then pass the key/value records directly into UnsafeExternalSorter:
> {code}
> 4B key+value length, 4B key length, key data, value data
> {code}
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