[jira] [Assigned] (SPARK-7542) Support off-heap sort buffer in UnsafeExternalSorter
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https://issues.apache.org/jira/browse/SPARK-7542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Davies Liu reassigned SPARK-7542:
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Assignee: Davies Liu
> Support off-heap sort buffer in UnsafeExternalSorter
>
>
> Key: SPARK-7542
> URL: https://issues.apache.org/jira/browse/SPARK-7542
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
>Affects Versions: 1.4.0
>Reporter: Josh Rosen
>Assignee: Davies Liu
>
> {{UnsafeExternalSorter}}, introduced in SPARK-7081, uses on-heap {{long[]}}
> arrays as its sort buffers. When records are small, the sorting array might
> be as large as the data pages, so it would be useful to be able to allocate
> this array off-heap (using our unsafe LongArray). Unfortunately, we can't
> currently do this because TimSort calls {{allocate()}} to create data buffers
> but doesn't call any corresponding cleanup methods to free them.
> We should look into extending TimSort with buffer freeing methods, then
> consider switching to LongArray in UnsafeShuffleSortDataFormat.
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[jira] [Assigned] (SPARK-7542) Support off-heap sort buffer in UnsafeExternalSorter
[
https://issues.apache.org/jira/browse/SPARK-7542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Spark reassigned SPARK-7542:
---
Assignee: (was: Apache Spark)
Support off-heap sort buffer in UnsafeExternalSorter
Key: SPARK-7542
URL: https://issues.apache.org/jira/browse/SPARK-7542
Project: Spark
Issue Type: New Feature
Components: Spark Core
Affects Versions: 1.4.0
Reporter: Josh Rosen
{{UnsafeExternalSorter}}, introduced in SPARK-7081, uses on-heap {{long[]}}
arrays as its sort buffers. When records are small, the sorting array might
be as large as the data pages, so it would be useful to be able to allocate
this array off-heap (using our unsafe LongArray). Unfortunately, we can't
currently do this because TimSort calls {{allocate()}} to create data buffers
but doesn't call any corresponding cleanup methods to free them.
We should look into extending TimSort with buffer freeing methods, then
consider switching to LongArray in UnsafeShuffleSortDataFormat.
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[jira] [Assigned] (SPARK-7542) Support off-heap sort buffer in UnsafeExternalSorter
[
https://issues.apache.org/jira/browse/SPARK-7542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Spark reassigned SPARK-7542:
---
Assignee: Apache Spark
Support off-heap sort buffer in UnsafeExternalSorter
Key: SPARK-7542
URL: https://issues.apache.org/jira/browse/SPARK-7542
Project: Spark
Issue Type: New Feature
Components: Spark Core
Affects Versions: 1.4.0
Reporter: Josh Rosen
Assignee: Apache Spark
{{UnsafeExternalSorter}}, introduced in SPARK-7081, uses on-heap {{long[]}}
arrays as its sort buffers. When records are small, the sorting array might
be as large as the data pages, so it would be useful to be able to allocate
this array off-heap (using our unsafe LongArray). Unfortunately, we can't
currently do this because TimSort calls {{allocate()}} to create data buffers
but doesn't call any corresponding cleanup methods to free them.
We should look into extending TimSort with buffer freeing methods, then
consider switching to LongArray in UnsafeShuffleSortDataFormat.
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