[SPARK-47986][CONNECT][PYTHON] Unable to create a new session when the default session is closed by the server #46435
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HyukjinKwon
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… the default session is closed by the server ### What changes were proposed in this pull request? This is a Scala port of #46221 and #46435. A client is unaware of a server restart or the server having closed the client until it receives an error. However, at this point, the client in unable to create a new session to the same connect endpoint, since the stale session is still recorded as the active and default session. With this change, when the server communicates that the session has changed via a GRPC error, the session and the respective client are marked as stale, thereby allowing a new default connection can be created via the session builder. In some cases, particularly when running older versions of the Spark cluster (3.5), the error actually manifests as a mismatch in the observed server-side session id between calls. With this fix, we also capture this case and ensure that this case is also handled. ### Why are the changes needed? Being unable to use getOrCreate() after an error is unacceptable and should be fixed. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? ./build/sbt testOnly *SparkSessionE2ESuite ### Was this patch authored or co-authored using generative AI tooling? No Closes #47008 from changgyoopark-db/SPARK-47986. Authored-by: Changgyoo Park <[email protected]> Signed-off-by: Hyukjin Kwon <[email protected]>
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What changes were proposed in this pull request?
This is a follow-up to a previous improvement - 7d04d0f.
In some cases, particularly when running older versions of the Spark
cluster (3.5), the error actually manifests as a mismatch in the
observed server-side session id between calls.
With this fix, we also capture this case and ensure that this case is
also handled.
Further, we improve the implementation of
getActiveSession()and introduce a similar
getDefaultSession()that accounts forstopped sessions.
This ensures that all places where default or active session is used,
stopped sessions are considered neither default nor active.
Why are the changes needed?
Explained above.
Does this PR introduce any user-facing change?
Previously, when client encounters a session mismatch, a user
cannot create a new session. With this change, a user can
call
getOrCreate()on the SparkSession builder and create anew session.
How was this patch tested?
Attached unit tests.
Was this patch authored or co-authored using generative AI tooling?
No.