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From 诺铁 <noty...@gmail.com>
Subject Re: SparkContext creation slow down unit tests
Date Tue, 16 Sep 2014 07:26:52 GMT
I connect my sample project to a hosted CI service, it only takes 3 seconds
to run there...while the same tests takes 2minutes on my macbook pro.  so
maybe this is a mac os specific problem?

On Tue, Sep 16, 2014 at 3:06 PM, 诺铁 <notyycn@gmail.com> wrote:

> hi,
>
> I am trying to write some unit test, following spark programming guide
> <http://spark.apache.org/docs/latest/programming-guide.html#unit-testing>
> .
> but I observed unit test runs very slow(the code is just a SparkPi),  so I
> turn log level to trace and look through the log output.  and found
> creation of SparkContext seems to take most time.
>
> there are some action take a lot of time:
> 1, seems starting jetty
> 14:04:55.038 [ScalaTest-run-running-MySparkPiSpec] DEBUG
> o.e.jetty.servlet.ServletHandler -
> servletNameMap={org.apache.spark.ui.JettyUtils$$anon$1-672f11c2=org.apache.spark.ui.JettyUtils$$anon$1-672f11c2}
> 14:05:25.121 [ScalaTest-run-running-MySparkPiSpec] DEBUG
> o.e.jetty.util.component.Container - Container
> org.eclipse.jetty.server.Server@e3cee7b +
> SelectChannelConnector@0.0.0.0:4040 as connector
>
> 2, I don't know what's this
> 14:05:25.202 [ScalaTest-run-running-MySparkPiSpec] DEBUG
> org.apache.hadoop.security.Groups - Group mapping
> impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping;
> cacheTimeout=300000
> 14:05:54.594 [spark-akka.actor.default-dispatcher-4] TRACE
> o.a.s.s.BlockManagerMasterActor - Checking for hosts with no recent heart
> beats in BlockManagerMaster.
>
>
> are there any way to make this faster for unit test?
> I also notice in spark's unit test, that there exists a SharedSparkContext
> <https://github.com/apache/spark/blob/master/core/src/test/scala/org/apache/spark/SharedSparkContext.scala>,
> is this the suggested way to work around this problem? if so, I would
> suggest to document this in programming guide.
>

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