@Jingyu
Yes, it works without regex and concatenation as the query below:
So, what we can understand from this? Because when i do like that, shuffle read
sizes are equally distributed between partitions.
val usersInputDF = sqlContext.sql(
s"""
| select userid from landing where dt='2015-9' and userid != '' and
userid is not null and userid is not NULL and pagetype = 'productDetail' group
by userid
""".stripMargin)
@java8964
I tried with sql.shuffle.partitions = 10000 but no luck. It’s again one of the
partitions shuffle size is huge and the others are very small.
——
So how can i balance this shuffle read size between partitions?
> On 24 Sep 2015, at 03:35, Zhang, Jingyu <[email protected]> wrote:
>
> Is you sql works if do not runs a regex on strings and concatenates them, I
> mean just Select the stuff without String operations?
>
> On 24 September 2015 at 10:11, java8964 <[email protected]
> <mailto:[email protected]>> wrote:
> Try to increase partitions count, that will make each partition has less data.
>
> Yong
>
> Subject: Re: Java Heap Space Error
> From: [email protected] <mailto:[email protected]>
> Date: Thu, 24 Sep 2015 00:32:47 +0300
> CC: [email protected] <mailto:[email protected]>
> To: [email protected] <mailto:[email protected]>
>
>
> Yes, it’s possible. I use S3 as data source. My external tables has
> partitioned. Belowed task is 193/200. Job has 2 stages and its 193. task of
> 200 in 2.stage because of sql.shuffle.partitions.
>
> How can i avoid this situation, this is my query:
>
> select userid,concat_ws(' ',collect_list(concat_ws(' ',if(productname is not
> NULL,lower(productname),''),lower(regexp_replace(regexp_replace(substr(productcategory,2,length(productcategory)-2),'\"',''),\",\",'
> '))))) inputlist from landing where dt='2015-9' and userid != '' and userid
> is not null and userid is not NULL and pagetype = 'productDetail' group by
> userid
>
> On 23 Sep 2015, at 23:55, java8964 <[email protected]
> <mailto:[email protected]>> wrote:
>
> Based on your description, you job shouldn't have any shuffle then, as you
> just apply regex and concatenation on the column, but there is one partition
> having 4.3M records to be read, vs less than 1M records for other partitions.
>
> Is that possible? It depends on what is the source of your data.
>
> If there is shuffle in your query (More than 2 stages generated by your
> query, and this is my guess of what happening), then it simple means that one
> partition having way more data than the rest of partitions.
>
> Yong
>
> From: [email protected] <mailto:[email protected]>
> Subject: Java Heap Space Error
> Date: Wed, 23 Sep 2015 23:07:17 +0300
> To: [email protected] <mailto:[email protected]>
>
> What can cause this issue in the attached picture? I’m running and sql query
> which runs a regex on strings and concatenates them. Because of this task, my
> job gives java heap space error.
>
> <Screen Shot 2015-09-23 at 23.03.18.png>
>
>
>
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