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feat(pregel): add requiredSrcColumns/requiredDstColumns API for triplet memory optimization#763
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SemyonSinchenko merged 3 commits intographframes:mainfrom Dec 30, 2025
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…et memory optimization Signed-off-by: joelrobin18 <joelrobin1818@gmail.com>
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Thanks a lot @joelrobin18 ! Looks very cool! I left two comments and I would like also to ask you to add a couple of words about the new API to the https://github.com/graphframes/graphframes/blob/main/docs/src/04-user-guide/10-pregel.md
Thanks!
Signed-off-by: joelrobin18 <joelrobin1818@gmail.com>
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LGTM! Nice work, thanks a lot @joelrobin18 !
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What changes were proposed in this pull request?
This PR adds a new API to Pregel for optimizing triplet memory consumption:
Why are the changes needed?
When constructing triplets in Pregel, we currently select all source and destination vertex columns (*), creating large intermediate DataFrames in memory. This is especially problematic for algorithms with large per-vertex state (e.g., cycle detection with stored sequences, future random walks).
This optimization allows users to explicitly specify which columns are needed, significantly reducing memory pressure for large-scale graph processing.