Hm, interesting! I don't think many of us have
used SparkSession.builder.getOrCreate
repeatedly in the same process. What happens if you manually stop the
spark session first, (session.stop()
<https://spark.apache.org/docs/latest/api/python/pyspark.sql.html?highlight=sparksession#pyspark.sql.SparkSession.stop>?)
or maybe try to explicitly create a new session via newSession()
<https://spark.apache.org/docs/latest/api/python/pyspark.sql.html?highlight=sparksession#pyspark.sql.SparkSession.newSession>
?
On Thu, Feb 6, 2020 at 7:31 PM Neil Shah-Quinn <nshahquinn(a)wikimedia.org>
wrote:
Hi Luca!
Those were separate Yarn jobs I started later. When I got this error, I
found that the Yarn job corresponding to the SparkContext was marked as
"successful", but I still couldn't get SparkSession.builder.getOrCreate to
open a new one.
Any idea what might have caused that or how I could recover without
restarting the notebook, which could mean losing a lot of in-progress work?
I had already restarted that kernel so I don't know if I'll encounter this
problem again. If I do, I'll file a task.
On Wed, 5 Feb 2020 at 23:24, Luca Toscano <ltoscano(a)wikimedia.org> wrote:
Hey Neil,
there were two Yarn jobs running related to your notebooks, I just
killed them, let's see if it solves the problem (you might need to restart
again your notebook). If not, let's open a task and investigate :)
Luca
Il giorno gio 6 feb 2020 alle ore 02:08 Neil Shah-Quinn <
nshahquinn(a)wikimedia.org> ha scritto:
Whoa—I just got the same stopped SparkContext
error on the query even
after restarting the notebook, without an intermediate Java heap space
error. That seems very strange to me.
On Wed, 5 Feb 2020 at 16:09, Neil Shah-Quinn <nshahquinn(a)wikimedia.org>
wrote:
> Hey there!
>
> I was running SQL queries via PySpark (using the wmfdata package
> <https://github.com/neilpquinn/wmfdata/blob/master/wmfdata/hive.py>)
> on SWAP when one of my queries failed with "java.lang.OutofMemoryError:
> Java heap space".
>
> After that, when I tried to call the spark.sql function again (via
> wmfdata.hive.run), it failed with "java.lang.IllegalStateException: Cannot
> call methods on a stopped SparkContext."
>
> When I tried to create a new Spark context using
> SparkSession.builder.getOrCreate (whether using wmfdata.spark.get_session
> or directly), it returned a SparkContent object properly, but calling the
> object's sql function still gave the "stopped SparkContext error".
>
> Any idea what's going on? I assume restarting the notebook kernel
> would take care of the problem, but it seems like there has to be a better
> way to recover.
>
> Thank you!
>
>
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