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[SPARK-51165][CORE] Enable spark.master.rest.enabled by default #49894

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[SPARK-51165][CORE] Enable spark.master.rest.enabled by default #49894

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2 changes: 1 addition & 1 deletion core/src/main/scala/org/apache/spark/internal/config/package.scala
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Expand Up @@ -1973,7 +1973,7 @@ package object config {
private[spark] val MASTER_REST_SERVER_ENABLED = ConfigBuilder("spark.master.rest.enabled")
.version("1.3.0")
.booleanConf
.createWithDefault(false)
.createWithDefault(true)

private[spark] val MASTER_REST_SERVER_HOST = ConfigBuilder("spark.master.rest.host")
.doc("Specifies the host of the Master REST API endpoint")
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4 changes: 4 additions & 0 deletions docs/core-migration-guide.md
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Expand Up @@ -22,6 +22,10 @@ license: |
* Table of contents
{:toc}

## Upgrading from Core 4.0 to 4.1

- Since Spark 4.1, Spark Master deamon provides REST API by default. To restore the behavior before Spark 4.1, you can set `spark.master.rest.enabled` to `false`.

## Upgrading from Core 3.5 to 4.0

- Since Spark 4.0, Spark migrated all its internal reference of servlet API from `javax` to `jakarta`
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2 changes: 1 addition & 1 deletion docs/spark-standalone.md
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Expand Up @@ -237,7 +237,7 @@ SPARK_MASTER_OPTS supports the following system properties:
</tr>
<tr>
<td><code>spark.master.rest.enabled</code></td>
<td><code>false</code></td>
<td><code>true</code></td>
<td>
Whether to use the Master REST API endpoint or not.
</td>
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