### What changes were proposed in this pull request?
This PR aims to add a new configuration, `spark.kubernetes.driver.reusePersistentVolumeClaim`, to reuse driver-owned `PersistentVolumeClaims` of the **deleted** executor pods.
Note also that `driver-owned PersistentVolumeClaims` is controlled by `spark.kubernetes.driver.ownPersistentVolumeClaim` which is recently added.
### Why are the changes needed?
PVC creations take some times. This feature can reduce it by reusing it.
For example, we can start `Pi` app with two executors with PVCs.
```
$ k logs -f pi | grep ExecutorPodsAllocator
21/05/16 23:36:32 INFO ExecutorPodsAllocator: Going to request 2 executors from Kubernetes for ResourceProfile Id: 0, target: 2 running: 0.
21/05/16 23:36:32 INFO ExecutorPodsAllocator: Found 0 reusable PVCs from 0 PVCs
21/05/16 23:36:32 INFO ExecutorPodsAllocator: Trying to create PersistentVolumeClaim pi-exec-1-pvc-0 with StorageClass scaleio
21/05/16 23:36:33 INFO ExecutorPodsAllocator: Trying to create PersistentVolumeClaim pi-exec-2-pvc-0 with StorageClass scaleio
```
After killing one executor, Spark is trying to look up the reusable PVCs, but the dead-executor's PVC may not returned yet because K8s works asynchronously. In this case, Spark is trying to create a new PVC as a normal operation.
```
21/05/16 23:38:51 INFO ExecutorPodsAllocator: Going to request 1 executors from Kubernetes for ResourceProfile Id: 0, target: 2 running: 1.
21/05/16 23:38:51 INFO ExecutorPodsAllocator: Found 0 reusable PVCs from 2 PVCs
21/05/16 23:38:51 INFO ExecutorPodsAllocator: Trying to create PersistentVolumeClaim pi-exec-3-pvc-0 with StorageClass scaleio
```
After killing another executor, Spark found one reusable PVC, `pi-exec-1-pvc-0`, and reuse it.
```
21/05/16 23:39:18 INFO ExecutorPodsAllocator: Going to request 1 executors from Kubernetes for ResourceProfile Id: 0, target: 2 running: 1.
21/05/16 23:39:18 INFO ExecutorPodsAllocator: Found 1 reusable PVCs from 3 PVCs
21/05/16 23:39:18 INFO ExecutorPodsAllocator: Reuse PersistentVolumeClaim pi-exec-1-pvc-0
```
In this case, we can easily notice the remounted PVC because `ClaimName`, `pi-exec-1-pvc-0`, doesn't have the prefix of pod name, `pi-exec-4`.
```
$ k describe pod pi-exec-4 | grep pi-exec-1-pvc-0
ClaimName: pi-exec-1-pvc-0
```
### Does this PR introduce _any_ user-facing change?
Yes, but this is a new feature which is disabled by the new conf.
### How was this patch tested?
Pass the CIs with the newly added test case.
K8S IT test also passed.
```
KubernetesSuite:
- Run SparkPi with no resources
- Run SparkPi with a very long application name.
- Use SparkLauncher.NO_RESOURCE
- Run SparkPi with a master URL without a scheme.
- Run SparkPi with an argument.
- Run SparkPi with custom labels, annotations, and environment variables.
- All pods have the same service account by default
- Run extraJVMOptions check on driver
- Run SparkRemoteFileTest using a remote data file
- Verify logging configuration is picked from the provided SPARK_CONF_DIR/log4j.properties
- Run SparkPi with env and mount secrets.
- Run PySpark on simple pi.py example
- Run PySpark to test a pyfiles example
- Run PySpark with memory customization
- Run in client mode.
- Start pod creation from template
- Launcher client dependencies
- SPARK-33615: Launcher client archives
- SPARK-33748: Launcher python client respecting PYSPARK_PYTHON
- SPARK-33748: Launcher python client respecting spark.pyspark.python and spark.pyspark.driver.python
- Launcher python client dependencies using a zip file
- Test basic decommissioning
- Test basic decommissioning with shuffle cleanup
- Test decommissioning with dynamic allocation & shuffle cleanups
- Test decommissioning timeouts
- Run SparkR on simple dataframe.R example
Run completed in 17 minutes, 7 seconds.
Total number of tests run: 26
Suites: completed 2, aborted 0
Tests: succeeded 26, failed 0, canceled 0, ignored 0, pending 0
All tests passed.
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 24:14 min
[INFO] Finished at: 2021-05-16T17:24:40-07:00
[INFO] ------------------------------------------------------------------------
```
Closes#32564 from dongjoon-hyun/SPARK-35416.
Authored-by: Dongjoon Hyun <dhyun@apple.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
4c015555da