GitHub user madanadit opened a pull request:
https://github.com/apache/spark/pull/21032
[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. Unit tests added to
`ExecutorPodFactorySuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/madanadit/spark k8s-vols
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21032.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 #21032
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commit a7edf6cf71e66caaec117335bb569f9ab93967f7
Author: madanadit <adit@...>
Date: 2018-04-05T01:02:25Z
Support mounting hostPath volumes for executors
commit 52f0d1cdcf125b3ba327a40360481eb4568991e2
Author: madanadit <adit@...>
Date: 2018-04-05T20:57:45Z
Read mode for mounted volumes
commit 70d050ea922d51f40384b7e473fe15dcfb5f4447
Author: madanadit <adit@...>
Date: 2018-04-05T22:05:07Z
Refactor
commit 463e9b5c227a42c4ae02f6e25475606ed66b50df
Author: madanadit <adit@...>
Date: 2018-04-06T18:18:09Z
Fix style
commit 0a21a19aca92a9409df0c03e24a8aa99d4dcd5b6
Author: madanadit <adit@...>
Date: 2018-04-06T19:57:45Z
Add unit tests
commit 87bcc9f638cc0720e00de86f46a3e677a8fc54c8
Author: madanadit <adit@...>
Date: 2018-04-06T20:00:18Z
Update comment
commit c72cbc1bd8a5043f5dbc55fa7ba0631c694a9317
Author: madanadit <adit@...>
Date: 2018-04-06T23:56:31Z
Fix unit tests
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