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https://issues.apache.org/jira/browse/SPARK-1985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-1985.
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Resolution: Not a Problem
> SPARK_HOME shouldn't be required when spark.executor.uri is provided
> --------------------------------------------------------------------
>
> Key: SPARK-1985
> URL: https://issues.apache.org/jira/browse/SPARK-1985
> Project: Spark
> Issue Type: Bug
> Components: Mesos
> Affects Versions: 1.0.0
> Environment: MESOS
> Reporter: Gerard Maas
>
> When trying to run that simple example on a Mesos installation, I get an
> error that "SPARK_HOME" is not set. A local spark installation should not be
> required to run a job on Mesos. All that's needed is the executor package,
> being the assembly.tar.gz on a reachable location (HDFS/S3/HTTP).
> I went looking into the code and indeed there's a check on SPARK_HOME [2]
> regardless of the presence of the assembly but it's actually only used if the
> assembly is not provided (which is a kind-of best-effort recovery strategy).
> Current flow:
> if (!SPARK_HOME) fail("No SPARK_HOME")
> else if (assembly) { use assembly) }
> else { try use SPARK_HOME to build spark_executor }
> Should be:
> sparkExecutor = if (assembly) {assembly}
> else if (SPARK_HOME) {try use SPARK_HOME to build
> spark_executor}
> else { fail("No executor found. Please provide
> spark.executor.uri (preferred) or spark.home")
> [1]
> http://apache-spark-user-list.1001560.n3.nabble.com/ClassNotFoundException-with-Spark-Mesos-spark-shell-works-fine-td6165.html
> [2]
> https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackend.scala#L89
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