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new 4db378fae30 [SPARK-44745][DOCS][K8S] Document shuffle data recovery
from the remounted K8s PVCs
4db378fae30 is described below
commit 4db378fae30733cbd2be41e95a3cd8ad2184e06f
Author: Dongjoon Hyun <dongj...@apache.org>
AuthorDate: Wed Aug 9 15:25:33 2023 -0700
[SPARK-44745][DOCS][K8S] Document shuffle data recovery from the remounted
K8s PVCs
### What changes were proposed in this pull request?
This PR aims to document an example of shuffle data recovery configuration
from the remounted K8s PVCs.
### Why are the changes needed?
This will help the users use this feature more easily.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Manual review because this is a doc-only change.
```
$ kubectl logs -f xxx-exec-16 | grep Kube
...
23/08/09 21:09:21 INFO KubernetesLocalDiskShuffleExecutorComponents: Try to
recover shuffle data.
23/08/09 21:09:21 INFO KubernetesLocalDiskShuffleExecutorComponents: Found
192 files
23/08/09 21:09:21 INFO KubernetesLocalDiskShuffleExecutorComponents: Try to
recover
/data/spark-x/executor-x/blockmgr-41a810ea-9503-447b-afc7-1cb104cd03cf/11/shuffle_0_11160_0.data
23/08/09 21:09:21 INFO KubernetesLocalDiskShuffleExecutorComponents: Try to
recover
/data/spark-x/executor-x/blockmgr-41a810ea-9503-447b-afc7-1cb104cd03cf/0e/shuffle_0_10063_0.data
23/08/09 21:09:21 INFO KubernetesLocalDiskShuffleExecutorComponents: Try to
recover
/data/spark-x/executor-x/blockmgr-41a810ea-9503-447b-afc7-1cb104cd03cf/0e/shuffle_0_10283_0.data
23/08/09 21:09:21 INFO KubernetesLocalDiskShuffleExecutorComponents: Ignore
a non-shuffle block file.
```
Closes #42417 from dongjoon-hyun/SPARK-44745.
Authored-by: Dongjoon Hyun <dongj...@apache.org>
Signed-off-by: Dongjoon Hyun <dongj...@apache.org>
---
docs/running-on-kubernetes.md | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/docs/running-on-kubernetes.md b/docs/running-on-kubernetes.md
index d3953592c4e..707a76196f3 100644
--- a/docs/running-on-kubernetes.md
+++ b/docs/running-on-kubernetes.md
@@ -394,6 +394,13 @@
spark.kubernetes.executor.volumes.persistentVolumeClaim.spark-local-dir-1.mount.
spark.kubernetes.executor.volumes.persistentVolumeClaim.spark-local-dir-1.mount.readOnly=false
```
+To enable shuffle data recovery feature via the built-in
`KubernetesLocalDiskShuffleDataIO` plugin, we need to have the followings. You
may want to enable `spark.kubernetes.driver.waitToReusePersistentVolumeClaim`
additionally.
+
+```
+spark.kubernetes.executor.volumes.persistentVolumeClaim.spark-local-dir-1.mount.path=/data/spark-x/executor-x
+spark.shuffle.sort.io.plugin.class=org.apache.spark.shuffle.KubernetesLocalDiskShuffleDataIO
+```
+
If no volume is set as local storage, Spark uses temporary scratch space to
spill data to disk during shuffles and other operations. When using Kubernetes
as the resource manager the pods will be created with an
[emptyDir](https://kubernetes.io/docs/concepts/storage/volumes/#emptydir)
volume mounted for each directory listed in `spark.local.dir` or the
environment variable `SPARK_LOCAL_DIRS` . If no directories are explicitly
specified then a default directory is created and configured [...]
`emptyDir` volumes use the ephemeral storage feature of Kubernetes and do not
persist beyond the life of the pod.
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