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Posted to reviews@spark.apache.org by "khakhlyuk (via GitHub)" <gi...@apache.org> on 2026/01/15 14:45:40 UTC
[PR] [SPARK-55047][CONNECT] Add client-side limit for local relation size [spark]
khakhlyuk opened a new pull request, #53815:
URL: https://github.com/apache/spark/pull/53815
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### What changes were proposed in this pull request?
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Currently, local relation sizes are limited using `spark.sql.session.localRelationSizeLimit` conf (set to 3GB by default).
This limit is only checked on the server. The client can upload arbitrary large relations, e.g. 100 GB, as artifacts, the server will store them, try to materialize the local relation on the driver and only then throw an error if the relation exceeds the limit.
This is bad for several reasons:
- The driver will need to store arbitrary amount of data and can run out of memory or disk space causing driver failure.
- The client wastes a lot of time uploading the data to the server only to fail later. This is bad UX.
This PR adds a check on the client side. If the client sees that the local relation it serializes exceeds the limit, it will throw an AnalysisException with error class LOCAL_RELATION_SIZE_LIMIT_EXCEEDED and sql state 54000 (program limit exceeded)
### Why are the changes needed?
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Improve driver stability when using large local relations in Spark Connect.
### Does this PR introduce _any_ user-facing change?
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No
### How was this patch tested?
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New integration tests for Scala and Python clients.
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No
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Re: [PR] [SPARK-55047][CONNECT] Add client-side limit for local relation size [spark]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #53815:
URL: https://github.com/apache/spark/pull/53815#issuecomment-3755224190
## JIRA Issue Information
=== Bug SPARK-55047 ===
Summary: [CONNECT] Add client-side limit for local relation size
Assignee: None
Status: Open
Affected: ["4.1.1"]
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Re: [PR] [SPARK-55047][CONNECT] Add client-side limit for local relation size [spark]
Posted by "asf-gitbox-commits (via GitHub)" <gi...@apache.org>.
asf-gitbox-commits closed pull request #53815: [SPARK-55047][CONNECT] Add client-side limit for local relation size
URL: https://github.com/apache/spark/pull/53815
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