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| author | Yin Huai <yhuai@databricks.com> | 2015-11-18 11:49:12 -0800 |
|---|---|---|
| committer | Yin Huai <yhuai@databricks.com> | 2015-11-18 11:49:12 -0800 |
| commit | 6f99522d13d8db9fcc767f7c3189557b9a53d283 (patch) | |
| tree | 61aa47395a77a6dfb22169d77a80a3f6b820671a /extras | |
| parent | 90a7519daaa7f4ee3be7c5a9aa244120811ff6eb (diff) | |
| download | spark-6f99522d13d8db9fcc767f7c3189557b9a53d283.tar.gz spark-6f99522d13d8db9fcc767f7c3189557b9a53d283.tar.bz2 spark-6f99522d13d8db9fcc767f7c3189557b9a53d283.zip | |
[SPARK-11792] [SQL] [FOLLOW-UP] Change SizeEstimation to KnownSizeEstimation and make estimatedSize return Long instead of Option[Long]
https://issues.apache.org/jira/browse/SPARK-11792
The main changes include:
* Renaming `SizeEstimation` to `KnownSizeEstimation`. Hopefully this new name has more information.
* Making `estimatedSize` return `Long` instead of `Option[Long]`.
* In `UnsaveHashedRelation`, `estimatedSize` will delegate the work to `SizeEstimator` if we have not created a `BytesToBytesMap`.
Since we will put `UnsaveHashedRelation` to `BlockManager`, it is generally good to let it provide a more accurate size estimation. Also, if we do not put `BytesToBytesMap` directly into `BlockerManager`, I feel it is not really necessary to make `BytesToBytesMap` extends `KnownSizeEstimation`.
Author: Yin Huai <yhuai@databricks.com>
Closes #9813 from yhuai/SPARK-11792-followup.
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