beliefer commented on a change in pull request #28096:
[SPARK-31295][DOC][FOLLOWUP] Supplement version for configuration appear in doc
URL: https://github.com/apache/spark/pull/28096#discussion_r402073245
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File path: docs/sql-performance-tuning.md
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@@ -193,34 +200,38 @@ Adaptive Query Execution (AQE) is an optimization
technique in Spark SQL that ma
### Coalescing Post Shuffle Partitions
This feature coalesces the post shuffle partitions based on the map output
statistics when both `spark.sql.adaptive.enabled` and
`spark.sql.adaptive.coalescePartitions.enabled` configurations are true. This
feature simplifies the tuning of shuffle partition number when running queries.
You do not need to set a proper shuffle partition number to fit your dataset.
Spark can pick the proper shuffle partition number at runtime once you set a
large enough initial number of shuffle partitions via
`spark.sql.adaptive.coalescePartitions.initialPartitionNum` configuration.
<table class="table">
- <tr><th>Property Name</th><th>Default</th><th>Meaning</th></tr>
+ <tr><th>Property Name</th><th>Default</th><th>Meaning</th><th>Since
Version</th></tr>
<tr>
<td><code>spark.sql.adaptive.coalescePartitions.enabled</code></td>
<td>true</td>
<td>
When true and <code>spark.sql.adaptive.enabled</code> is true, Spark
will coalesce contiguous shuffle partitions according to the target size
(specified by <code>spark.sql.adaptive.advisoryPartitionSizeInBytes</code>), to
avoid too many small tasks.
</td>
+ <td>3.0.0</td>
</tr>
<tr>
<td><code>spark.sql.adaptive.coalescePartitions.minPartitionNum</code></td>
<td>Default Parallelism</td>
<td>
The minimum number of shuffle partitions after coalescing. If not set,
the default value is the default parallelism of the Spark cluster. This
configuration only has an effect when <code>spark.sql.adaptive.enabled</code>
and <code>spark.sql.adaptive.coalescePartitions.enabled</code> are both enabled.
</td>
+ <td>3.0.0</td>
</tr>
<tr>
<td><code>spark.sql.adaptive.coalescePartitions.initialPartitionNum</code></td>
<td>200</td>
<td>
The initial number of shuffle partitions before coalescing. By default
it equals to <code>spark.sql.shuffle.partitions</code>. This configuration only
has an effect when <code>spark.sql.adaptive.enabled</code> and
<code>spark.sql.adaptive.coalescePartitions.enabled</code> are both enabled.
</td>
+ <td>3.0.0</td>
Review comment:
SPARK-31037, commit ID:
46b7f1796bd0b96977ce9b473601033f397a3b18#diff-9a6b543db706f1a90f790783d6930a13
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