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Posted to issues@spark.apache.org by "Fabien (Jira)" <ji...@apache.org> on 2022/03/01 11:09:00 UTC
[jira] [Commented] (SPARK-38111) Retrieve a Spark dataframe as Arrow batches
[ https://issues.apache.org/jira/browse/SPARK-38111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499459#comment-17499459 ]
Fabien commented on SPARK-38111:
--------------------------------
Hello,
Sorry for the long time and thank you for the response.
I'll try toArrowBatchRdd and see if I managed to do what I want !
> Retrieve a Spark dataframe as Arrow batches
> -------------------------------------------
>
> Key: SPARK-38111
> URL: https://issues.apache.org/jira/browse/SPARK-38111
> Project: Spark
> Issue Type: Question
> Components: Java API
> Affects Versions: 3.2.0
> Environment: Java 11
> Spark 3
> Reporter: Fabien
> Priority: Minor
> Labels: arrow
>
> Using the Java API, is there a way to efficiently retrieve a dataframe as Arrow batches ?
> I have a pretty large dataset on my cluster so I cannot collect it using [collectAsList|https://spark.apache.org/docs/latest/api/java/org/apache/spark/sql/Dataset.html#collectAsList--] which download every thing at once and saturate my JVM memory
> Seeing that Arrow is becoming a standard to transfer large datasets and that Spark uses a lot Arrow, is there a way to transfer my Spark dataframe with Arrow batches ?
> This would be ideal to process the data batch per batch and avoid saturating the memory.
>
> I am looking for an API like this (in Java)
>
> {code:java}
> var stream = dataframe.collectAsArrowStream()
> while (stream.hasNextBatch()) {
> var batch = stream.getNextBatch()
> // do some stuff with the arrow batch
> }
> {code}
> It would be even better if I can split the dataframe into several streams so I can download and process it in parallel
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