ulysses-you opened a new pull request #33550:
URL: https://github.com/apache/spark/pull/33550
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### What changes were proposed in this pull request?
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Use short string as executor pod name prefix if app name is long.
### Why are the changes needed?
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If we have a long spark app name and start with k8s master, we will get the
execption.
```
java.lang.IllegalArgumentException:
'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-89fe2f7ae71c3570' in
spark.kubernetes.executor.podNamePrefix is invalid. must conform
https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-label-names
and the value length <= 47
at
org.apache.spark.internal.config.TypedConfigBuilder.$anonfun$checkValue$1(ConfigBuilder.scala:108)
at
org.apache.spark.internal.config.TypedConfigBuilder.$anonfun$transform$1(ConfigBuilder.scala:101)
at scala.Option.map(Option.scala:230)
at
org.apache.spark.internal.config.OptionalConfigEntry.readFrom(ConfigEntry.scala:239)
at
org.apache.spark.internal.config.OptionalConfigEntry.readFrom(ConfigEntry.scala:214)
at org.apache.spark.SparkConf.get(SparkConf.scala:261)
at
org.apache.spark.deploy.k8s.KubernetesConf.get(KubernetesConf.scala:67)
at
org.apache.spark.deploy.k8s.KubernetesExecutorConf.<init>(KubernetesConf.scala:147)
at
org.apache.spark.deploy.k8s.KubernetesConf$.createExecutorConf(KubernetesConf.scala:231)
at
org.apache.spark.scheduler.cluster.k8s.ExecutorPodsAllocator.$anonfun$requestNewExecutors$2(ExecutorPodsAllocator.scala:367)
```
Use app name as the executor pod name is the Spark internal behavior and we
should not make application failure.
### Does this PR introduce _any_ user-facing change?
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yes
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the new log:
```
21/07/28 09:35:53 INFO SparkEnv: Registering OutputCommitCoordinator
21/07/28 09:35:54 INFO Utils: Successfully started service 'SparkUI' on port
41926.
21/07/28 09:35:54 INFO SparkUI: Bound SparkUI to 0.0.0.0, and started at
http://:41926
21/07/28 09:35:54 WARN KubernetesClusterManager: Use spark-c460617aeac0fda9
as the executor pod's name prefix due to spark.app.name is too long. Please set
'spark.kubernetes.executor.podNamePrefix' if you need a custom executor pod's
name prefix.
21/07/28 09:35:54 INFO SparkKubernetesClientFactory: Auto-configuring K8S
client using current context from users K8S config file
21/07/28 09:35:55 WARN Utils: spark.executor.instances less than
spark.dynamicAllocation.minExecutors is invalid, ignoring its setting, please
update your configs.
```
verify the config:
verify the executor pod name
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