Hi Kapil,
Thanks for suggestion. Yes, It worked.
Regards
Sachit
On Tue, 9 Mar 2021, 00:19 Kapil Garg, wrote:
> Hi Sachit,
> What do you mean by "spark is running only 1 executor with 1 task" ?
> Did you submit the spark application with multiple executors but only 1 is
> being used and rest are idle ?
> If that's the case, then it might happen due to spark.locality.wait
> setting which is by default set to 3s. This will enable spark to wait for
> 3s for the tasks to finish on the executor before submitting the next batch
> on another executors. This happens due to spark's preference for cached
> kafka consumers.
>
> And regarding having 1 task doing all the processing. Please check if your
> kafka topic has only 1 partition. Spark draws the parallelism from the
> number of partitions in the kafka topic. Once you have loaded the data from
> partitions, you can choose to repartition the batch so it is processed by
> multiple tasks.
>
> On Mon, Mar 8, 2021 at 10:57 PM Sachit Murarka
> wrote:
>
>> Hi All,
>>
>> I am using Spark 3.0.1 Structuring streaming with Pyspark.
>>
>> The problem is spark is running only 1 executor with 1 task. Following is
>> the summary of what I am doing.
>>
>> Can anyone help on why my executor is 1 only?
>>
>> def process_events(event):
>> fetch_actual_data()
>> #many more steps
>>
>> def fetch_actual_data():
>> #applying operation on actual data
>>
>> df = spark.readStream.format("kafka") \
>> .option("kafka.bootstrap.servers", KAFKA_URL) \
>> .option("subscribe", KAFKA_TOPICS) \
>> .option("startingOffsets",
>> START_OFFSET).load() .selectExpr("CAST(value AS STRING)")
>>
>>
>> query =
>> df.writeStream.foreach(process_events).option("checkpointLocation",
>> "/opt/checkpoint").trigger(processingTime="30 seconds").start()
>>
>>
>>
>> Kind Regards,
>> Sachit Murarka
>>
>
>
> --
> Regards
> Kapil Garg
>
>
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