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https://issues.apache.org/jira/browse/SPARK-31726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17480756#comment-17480756
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koert kuipers edited comment on SPARK-31726 at 1/23/22, 11:22 PM:
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[~beregon87] about --jars, are you seeing that the jars are also not available
on driver, or not added to classpath, or both?
i ran a simple test where i added a jar from s3, e.g. --jars
s3a://some/jar.jar, and was surprised to find the driver could not find a class
in that jar (on kubernetes with cluster deploy mode). this would be a more
serious bug given the description of --jars clearly says it should:
--jars JARS Comma-separated list of jars to include on the driver and
executor classpaths.
now with --files its to bad the drivers dont get it but at least it does what
it says on the tin (which does not include a promise to get the files to the
driver):
--files FILES Comma-separated list of files to be placed in the working
directory of each executor.
was (Author: koert):
[~beregon87] about --jars, are you seeing that the jars are also not available
on driver, or not added to classpath, or both?
i ran a simple test where i added a jar from s3, e.g. --jars
s3a://some/jar.jar, and was surprised to find the driver could not find a class
in that jar (on kubernetes with cluster deploy mode). this would be a more
serious bug given the description of --jars clearly says it should:
Comma-separated list of jars to include on the driver and executor classpaths.
now with --files its to bad the drivers dont get it but at least it does what
it says on the tin (which does not include a promise to get the files to the
driver):
Comma-separated list of files to be placed in the working directory of each
executor.
> Make spark.files available in driver with cluster deploy mode on kubernetes
> ---------------------------------------------------------------------------
>
> Key: SPARK-31726
> URL: https://issues.apache.org/jira/browse/SPARK-31726
> Project: Spark
> Issue Type: Improvement
> Components: Kubernetes, Spark Core
> Affects Versions: 3.0.0
> Reporter: koert kuipers
> Priority: Minor
>
> currently on yarn with cluster deploy mode --files makes the files available
> for driver and executors and also put them on classpath for driver and
> executors.
> on k8s with cluster deploy mode --files makes the files available on
> executors but they are not on classpath. it does not make the files available
> on driver and they are not on driver classpath.
> it would be nice if the k8s behavior was consistent with yarn, or at least
> makes the files available on driver. once the files are available there is a
> simple workaround to get them on classpath using
> spark.driver.extraClassPath="./"
> background:
> we recently started testing kubernetes for spark. our main platform is yarn
> on which we use client deploy mode. our first experience was that client
> deploy mode was difficult to use on k8s (we dont launch from inside a pod).
> so we switched to cluster deploy mode, which seems to behave well on k8s. but
> then we realized that our program rely on reading files on classpath
> (application.conf, log4j.properties etc.) that are on the client but now are
> no longer on the driver (since driver is no longer on client). an easy fix
> for this seems to be to ship the files using --files to make them available
> on driver, but we could not get this to work.
>
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