pan3793 opened a new pull request, #40831:
URL: https://github.com/apache/spark/pull/40831
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### What changes were proposed in this pull request?
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This PR allows the users to custom Unix username in Pod by setting env var
`SPARK_USER_NAME`, which reduces the gap between Spark on YARN and K8s.
Each line in `/etc/passwd` is compose of
```
username:password:UID:GID:comment:home_directory:shell
```
This PR simply change the first item from `$myuid` to
`${SPARK_USER_NAME:$myuid}` to achieve the above ability.
### Why are the changes needed?
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In Spark on Yarn mode, when we launch a Spark application via `spark-submit
--proxy-user jack ...`, the Yarn will launch containers(usually Linux
processes) using Unix user "jack", and some components/libraries rely on the
login user in default, one example is Alluxio
https://github.com/Alluxio/alluxio/blob/da77d688bdbb0cf0c6477bed4d3187897fe2a2e1/core/common/src/main/java/alluxio/conf/PropertyKey.java#L6469-L6476
```
public static final PropertyKey SECURITY_LOGIN_USERNAME =
stringBuilder(Name.SECURITY_LOGIN_USERNAME)
.setDescription("When alluxio.security.authentication.type is set
to SIMPLE or "
+ "CUSTOM, user application uses this property to indicate the
user requesting "
+ "Alluxio service. If it is not set explicitly, the OS login
user will be used.")
.setConsistencyCheckLevel(ConsistencyCheckLevel.ENFORCE)
.setScope(Scope.CLIENT)
.build();
```
To reduce the difference between Spark on YARN and Spark on K8s, we hope
Spark on K8s keeps the same ability to allow to dynamically change login user
on submitting Spark application.
### Does this PR introduce _any_ user-facing change?
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Yes, it allows the user to custom Pod Unix username by setting env var
`SPARK_USER_NAME` in K8s, reducing the gap between Spark YARN and K8s.
### How was this patch tested?
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Manually testing in our internal K8s cluster.
```
spark-submit --master=k8s://xxxx \
--conf spark.kubernetes.driverEnv.SPARK_USER_NAME=tom \
--conf spark.executorEnv.SPARK_USER_NAME=tom \
--proxy-user tom \
...
```
And login the Pod, verify the Unix username is `tom` instead of `185`
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