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[SPARK-23640][CORE] Fix hadoop config may override spark config #20785

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[SPARK-23640][CORE] Fix hadoop config may override spark config #20785

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9745ec3
Fix hadoop config may override spark config
wangyum Mar 9, 2018
0034a58
Change Utils.getSparkOrYarnConfig
wangyum Mar 10, 2018
06bb6f8
Change getSparkOrYarnConfig value order
wangyum Mar 17, 2018
a1eb874
Update scaladoc
wangyum Mar 30, 2018
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3 changes: 2 additions & 1 deletion core/src/main/scala/org/apache/spark/util/Utils.scala
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Expand Up @@ -2434,7 +2434,8 @@ private[spark] object Utils extends Logging {
*/
def getSparkOrYarnConfig(conf: SparkConf, key: String, default: String): String = {
val sparkValue = conf.get(key, default)
if (conf.get(SparkLauncher.SPARK_MASTER, null) == "yarn") {
if (conf.get(SparkLauncher.SPARK_MASTER, null) == "yarn"

@vanzin vanzin Mar 16, 2018

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No.

The logic you want here is the equivalent of:

if conf.contains(key)
  get spark conf
elif is_running_on_yarn()
  get conf from yarn
else
  return default

@wangyum wangyum Mar 16, 2018

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Assuming that --conf spark.shuffle.service.port = 7338 is configured, 7338 is displayed on the tab of the environment, but 7337 is actually used.
So my idea is get value from SparkConf if key starting with spark. except for spark.hadoop..

@wangyum wangyum Mar 16, 2018

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YarnConfiguration can only configure one spark.shuffle.service.port value.
We can gradually upgrade the shuffle service if get spark.shuffle.service.port value from SparkConf because we can set different values ​​for different applications.

@vanzin vanzin Mar 16, 2018

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I'm not sure I follow what you're saying, but let me explain how the configuration is expected to work.

"spark." options are set in "SparkConf". "spark.hadoop.*" options, on top of those, should also be reflected in any Hadoop Configuration objects that are created.

So you should never need to directly reference "spark.hadoop." properties in Spark code. They are not meant to be used by Spark, they are meant to be Hadoop configs. That's why I'm saying your code should not be doing what it is doing.

From what I understand of what you're trying to do, you want "spark.shuffle.service.port" to have precedence over the YARN configuration. For that, you just do what I suggested above. Check whether it's set in the Spark configuration before you even look at any Hadoop configuration.

The current order of precedence should be:

  • spark.hadoop.spark.shuffle.service.port (since it overrides Hadoop config)
  • hadoop config (spark.shuffle.service.port set in xml files)
  • spark.shuffle.service.port

You're proposing moving the lowest one to the top. That's a simple change. If you're trying to also fix something else, then it means there's a problem in another place.

&& (key.startsWith("spark.hadoop.") || !key.startsWith("spark."))) {
new YarnConfiguration(SparkHadoopUtil.get.newConfiguration(conf)).get(key, sparkValue)
} else {
sparkValue
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