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Posted to user@spark.apache.org by aecc <al...@gmail.com> on 2014/12/16 11:24:35 UTC
Locality level and Kryo
Hi guys,
It happens to me quite often that when the locality level of a task goes
further than LOCAL (NODE, RACK, etc), I get some of the following
exceptions: "too many files open", "encountered unregistered class id",
"cannot cast X to Y".
I do not get any exceptions during shuffling (which means that kryo works
well).
I'm running Spark 1.0.0 with the following characteristics:
- 18 executors with 30G each
- Yarn client mode
- ulimit is defined in 500k
- Input data: hdfs file with 1000 partitions and 10 GB of size
Please any hint would be appreciated
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Re: Locality level and Kryo
Posted by Akhil Das <ak...@sigmoidanalytics.com>.
Make sure ulimit is set system wide across the cluster (ulimit -a). Also
reduce the number of partitions to a smaller number (say 200-500) to get
ride of *the too many open files*.
Thanks
Best Regards
On Tue, Dec 16, 2014 at 3:54 PM, aecc <al...@gmail.com> wrote:
>
> Hi guys,
>
> It happens to me quite often that when the locality level of a task goes
> further than LOCAL (NODE, RACK, etc), I get some of the following
> exceptions: "too many files open", "encountered unregistered class id",
> "cannot cast X to Y".
>
> I do not get any exceptions during shuffling (which means that kryo works
> well).
>
> I'm running Spark 1.0.0 with the following characteristics:
>
> - 18 executors with 30G each
> - Yarn client mode
> - ulimit is defined in 500k
> - Input data: hdfs file with 1000 partitions and 10 GB of size
>
> Please any hint would be appreciated
>
>
>
> --
> View this message in context:
> http://apache-spark-user-list.1001560.n3.nabble.com/Locality-level-and-Kryo-tp20708.html
> Sent from the Apache Spark User List mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@spark.apache.org
> For additional commands, e-mail: user-help@spark.apache.org
>
>