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https://issues.apache.org/jira/browse/SPARK-61261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-61261:
-----------------------------------
Labels: pull-request-available (was: )
> Reattach after a dropped connection instead of failing the query, in Spark
> Connect Rust as PySpark does
> -------------------------------------------------------------------------------------------------------
>
> Key: SPARK-61261
> URL: https://issues.apache.org/jira/browse/SPARK-61261
> Project: Spark
> Issue Type: Bug
> Components: Connect
> Affects Versions: connect-rust-4.3.0
> Reporter: Tim Meehan
> Priority: Major
> Labels: pull-request-available
> Fix For: connect-rust-4.3.0
>
>
> When the connection drops in the middle of a result, PySpark's Connect client
> reconnects and reattaches to the execution and returns every row. The Rust
> client fails the query instead.
> Repro: put a TCP proxy between the client and an OSS Spark 4.3.0 Connect
> server that resets the connection once, after about 2 MB of response, and
> collect spark.range(3_000_000).
> * pyspark-client 4.3.0 reconnects, sends ReattachExecute and returns all
> 3,000,000 rows, also after three resets.
> * spark-connect-rust fails after about 0.5 seconds with "[Unknown error] h2
> protocol error: error reading a body from connection" (measured at 4ad36945).
> At 8768cc4 it still fails, with the same kind of proxy in front of a mock
> server.
> From source: grpc-python reports the reset as UNAVAILABLE, which PySpark's
> retry policy retries. tonic reports it as Unknown, and
> DefaultPolicy::can_retry (crates/spark-connect-core/src/retries.rs:73)
> retries only Unavailable, and Internal with INVALID_CURSOR.DISCONNECTED, so
> the reattach loop gives up. SPARK-60964 made each reattach retry, but this
> error never reaches the retry.
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