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[Bug]: Go Prism Runner Concurrent Map Mutations #32656
Description
What happened?
There are race conditions in the Server of the prism runner's gRPC server in Go. Reads and writes to the artifacts variable within Server are not protected by a mutex. This means race detection will occasionally crash this logic because it's not thread safe.
Given the nature of this class. It's likely other variables are at risk of races as well.
fatal error: concurrent map writes
goroutine 1737 [running]:
github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism/internal/jobservices.(*Server).ReverseArtifactRetrievalService(0xc0001195c0, {0x29c74a0, 0xc000be4570})
/github/home/go/pkg/mod/github.com/apache/beam/sdks/v2@v2.59.0/go/pkg/beam/runners/prism/internal/jobservices/artifact.go:87 +0x885
github.com/apache/beam/sdks/v2/go/pkg/beam/model/jobmanagement_v1._ArtifactStagingService_ReverseArtifactRetrievalService_Handler({0x2693b80?, 0xc0001195c0}, {0x29c06d0, 0xc000b321e0})
/github/home/go/pkg/mod/github.com/apache/beam/sdks/v2@v2.59.0/go/pkg/beam/model/jobmanagement_v1/beam_artifact_api_grpc.pb.go:272 +0xd8
google.golang.org/grpc.(*Server).processStreamingRPC(0xc000565a00, {0x29bb248, 0xc000b138c0}, {0x29d4640, 0xc000494b60}, 0xc00167a7e0, 0xc000319c80, 0x4ced6a0, 0x0)
/github/home/go/pkg/mod/google.golang.org/grpc@v1.67.1/server.go:1688 +0x1208
google.golang.org/grpc.(*Server).handleStream(0xc000565a00, {0x29d4640, 0xc000494b60}, 0xc00167a7e0)
/github/home/go/pkg/mod/google.golang.org/grpc@v1.67.1/server.go:1809 +0xe3a
google.golang.org/grpc.(*Server).serveStreams.func2.1()
/github/home/go/pkg/mod/google.golang.org/grpc@v1.67.1/server.go:1029 +0x7f
created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 1616
/github/home/go/pkg/mod/google.golang.org/grpc@v1.67.1/server.go:1040 +0x125
Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
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Activity
github-actions commentedon Jul 2, 2025
This issue has been marked as stale due to 150 days of inactivity. It will be closed in 30 days if no further activity occurs. If you think that’s incorrect or this issue still needs to be addressed, please simply write any comment. If closed, you can reopen the issue at any time. Thank you for your contributions.
github-actions commentedon Aug 1, 2025
This issue has been closed due to lack of activity. If you think that is incorrect, you can reopen the issue at any time.
waneal commentedon Sep 11, 2026
.reopen-issue
waneal commentedon Sep 11, 2026
.take-issue
Fix data race on Prism runner's artifact cache map
Fix data race on Prism runner's artifact cache map (#40197)