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Data Engineering
Join discussions on data engineering best practices, architectures, and optimization strategies within the Databricks Community. Exchange insights and solutions with fellow data engineers.
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Nastasia
by • New Contributor II
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Why is Spark creating multiple jobs for one action?

I noticed that when launching this bunch of code with only one action, I have three jobs that are launched.from pyspark.sql import DataFrame from pyspark.sql.types import StructType, StructField, StringType from pyspark.sql.functions import avgdata:...

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Data Engineering
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RKNutalapati
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The above code will create two jobs.JOB-1. dataframe: DataFrame = spark.createDataFrame(data=data,schema=schema)The createDataFrame function is responsible for inferring the schema from the provided data or using the specified schema.Depending on the...

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Charmin
by • New Contributor
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Why 'runCommand' action does NOT show up in databricksNotebook audit log table?

I understand databricks can send diagnostic/audit logs to log analytics in azure. There is a standard 'DatabricksNotebook' table that provides audit log for notebook actions. In this table there is an action called 'runCommand' but this does not show...

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rsamant07
New Contributor III
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Hi @Charmin patel​  , you need to enable verbose audit logging in workspace setting for runCommand to appear in the audit logs

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Mradul07
by • New Contributor II
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Spark behavior while dealing with Actions & Transformations ?

Hi, My question is - what happens to the initial RDD after the action is performed on it. Does it disappear or stays in the memory or does it needs to be explicitly cached() if we want to use it again.For eg : If I execute this in a sequence :df_outp...

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aladda
by • Honored Contributor II
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Resolved! What is the difference between a Transformation and Action in Spark?

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aladda
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Spark's execution engine is designed to be Lazy. In effect, you're first up build up your analytics/data processing request through a series of Transformations which are then executed by an ActionTransformations are kind of operations which will tran...

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