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Posted to issues@spark.apache.org by "Adit Madan (JIRA)" <ji...@apache.org> on 2018/04/05 21:50:00 UTC
[jira] [Commented] (SPARK-23529) Specify hostpath volume and mount
the volume in Spark driver and executor pods in Kubernetes
[ https://issues.apache.org/jira/browse/SPARK-23529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16427650#comment-16427650 ]
Adit Madan commented on SPARK-23529:
------------------------------------
Hi [~foxish], I also have a use case for using hostpath volumes and would be happy to contribute the implementation.
Summary: 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 directory to the Alluxio worker w/o passing through network stack. The end result is faster data access when data is local.
Appreciate your thoughts on this!. I have an implementation ready exposing a new property spark.kubernetes.executor.volumes taking the value of the form hostPath:containerPath[:ro|rw].
> Specify hostpath volume and mount the volume in Spark driver and executor pods in Kubernetes
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-23529
> URL: https://issues.apache.org/jira/browse/SPARK-23529
> Project: Spark
> Issue Type: Improvement
> Components: Kubernetes
> Affects Versions: 2.3.0
> Reporter: Suman Somasundar
> Assignee: Anirudh Ramanathan
> Priority: Minor
>
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