GitHub user madanadit opened a pull request:
https://github.com/apache/spark/pull/20989
[SPARK-23529][K8s] Support mounting hostPath volumes for executors
## What changes were proposed in this pull request?
This PR introduces a new config `spark.kubernetes.executor.volumes` taking
a values of the form `hostPath:containerPath[:ro|rw][,...]`; where `hostPath`
is the path for the executor pod volume, `containerPath` is the mount path and
`ro` is read-only mode.
The use case is to enable short-circuit writes to distributed storage on
k8s. The Alluxio File System uses domain sockets to enable short-circuit writes
from the client to worker memory when co-located on the same host machine. A
directory, lets say /tmp/domain on the host, is mounted on the Alluxio worker
container as well as the Alluxio client ( = Spark executor) container. The
worker creates a domain socket /tmp/domain/d and if the client container mounts
the same directory, it can write directly to the Alluxio worker w/o passing
through network stack. The end result is faster data access when data is local.
## How was this patch tested?
Manual testing on a k8s v1.8 cluster.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/madanadit/spark k8s-volumes
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20989.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20989
commit addb8fec7c7fcd1535cfdc29594d74b04981ae19
Author: madanadit
Date: 2018-04-05T01:02:25Z
Spark executor volumes configuration
commit f33eaf53b914c3414a4d4a2bca9c5bc3d84aa268
Author: madanadit
Date: 2018-04-05T20:05:48Z
Fix style
commit 4016d6d33c296823e338f28deb7815c4be6607a1
Author: madanadit
Date: 2018-04-05T20:12:28Z
Undo unintended style change
commit c5b6c0bdc0ac46e87d4ca41ab27b81be62beee6f
Author: madanadit
Date: 2018-04-05T20:57:45Z
Read mode for mounted volumes
commit 17cfdf3afede72efd970c1d3ac92105257c1f63c
Author: madanadit
Date: 2018-04-05T22:05:07Z
Refactor
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