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https://issues.apache.org/jira/browse/MESOS-3527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032510#comment-15032510
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Alan Braithwaite commented on MESOS-3527:
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In the container and not on the slave.
The motivation for this is not wanting to deploy HDFS configs everywhere and
isolate them to docker containers (which is also how we run hdfs).
> HDFS HA fails outside of docker context
> ---------------------------------------
>
> Key: MESOS-3527
> URL: https://issues.apache.org/jira/browse/MESOS-3527
> Project: Mesos
> Issue Type: Bug
> Reporter: Alan Braithwaite
> Labels: fetcher, hdfs, mesosphere, spark
>
> I'm using Spark with the Mesos driver.
> When I pass in a `hdfs://<namespace>/path` url in for the spark application,
> the fetcher attempts to download the jar files outside the spark context (the
> docker container in this case). The problem is that the core-site.xml and
> hdfs-site.xml configs exist inside the container. The host machine does not
> have the necessary hdfs configuration to connect to the HA cluster.
> Currently, I'm not sure what the alternative ways of accessing a HA hadoop
> cluster besides through the hadoop client.
> {code}
> I0926 06:34:19.346851 18851 fetcher.cpp:214] Fetching URI
> 'hdfs://hdfsha/tmp/spark-job.jar'
> I0926 06:34:19.622860 18851 fetcher.cpp:99] Fetching URI
> 'hdfs://hdfsha/tmp/spark-job.jar' using Hadoop Client
> I0926 06:34:19.622936 18851 fetcher.cpp:109] Downloading resource from
> 'hdfs://hdfsha/tmp/spark-job.jar' to
> '/state/var/lib/mesos/slaves/20150602-065056-269165578-5050-17724-S12/frameworks/20150914-102037-285942794-5050-31214-0029/executors/driver-20150926063418-0002/runs/9953ae1b-9387-489f-8645-5472d9c5eacf/spark-job.jar'
> E0926 06:34:20.814858 18851 fetcher.cpp:113] HDFS copyToLocal failed:
> /usr/local/hadoop/bin/hadoop fs -copyToLocal
> 'hdfs://hdfsha/tmp/spark-job.jar'
> '/state/var/lib/mesos/slaves/20150602-065056-269165578-5050-17724-S12/frameworks/20150914-102037-285942794-5050-31214-0029/executors/driver-20150926063418-0002/runs/9953ae1b-9387-489f-8645-5472d9c5eacf/spark-job.jar'
> -copyToLocal: java.net.UnknownHostException: hdfsha
> Usage: hadoop fs [generic options] -copyToLocal [-p] [-ignoreCrc] [-crc]
> <src> ... <localdst>
> Failed to fetch: hdfs://hdfsha/tmp/spark-job.jar
> {code}
> The code in question:
> https://github.com/apache/mesos/blob/fbb12a52969710fe69c309c83db0a5441dbea886/src/launcher/fetcher.cpp#L92-L114
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