[dgraph v25] failed when calling List.rollup: while encoding: cannot iterate through the list
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bug
- Dominant language
- Go
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- Avg merge
- 2d 5h
- Merged PRs (30d)
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Description
Describe the bug
seeing error logs failed when calling List.rollup: while encoding: cannot iterate through the list in alpha pods.
It seems to happen on nodes with large-sized data. we added @lang directive for multi-languages in the predicate.
logs
W0724 09:43:14.902606 1 mvcc.go:181] Error rolling up key [failed when calling List.rollup: while encoding: cannot iterate through the list: cannot initialize iterator when calling List.iterate minTs: 58256931, plist: splits:1 splits:8523883114575535643, mutationMap: Committed List: map[58550095:postings:{uid:17043778602460988961 value: {large size html data}
To Reproduce
Expected behavior
No error logs
Screenshots
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Environment
Version : v25.3.4
deployed in k8s
Additional context
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Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with mvcc.go:181 and trace the List.rollup and List.iterate paths named in the log. Reproduce on Dgraph v25.3.4 with large data and a multi-language predicate in Kubernetes, then establish a testable case where rollup completes without the iterator error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- go, kubernetes
- Domain
- databases, distributed-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100