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fix error when loading agglomerate skeleton for single-segment agglomerate #6294

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merged 1 commit into from Jun 22, 2022

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fm3
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@fm3 fm3 commented Jun 22, 2022

In newer hdf handling code we already added zero-length checks, but this old code did not have them. So when loading single-segment agglomerate skeletons, the edges array was empty, which cannot be passed to jhdf5 as is.

  • Needs datastore update after deployment
  • Ready for review

@fm3 fm3 added the backend label Jun 22, 2022
@fm3 fm3 requested a review from daniel-wer June 22, 2022 13:31
@fm3 fm3 self-assigned this Jun 22, 2022
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I wanted to test this, but I'm not able to reproduce the error locally on master. I'm in a hybrid annotation without an editable mapping, rightclick - "Import Agglomerate Skeleton" for an agglomerate skeleton with a single node. Loads just fine 🤔

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fm3 commented Jun 22, 2022

huh that is odd. And the request is going to the datastore, and a skeleton with no edges is returned? Could you give me the relevant agglomerate file?

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daniel-wer commented Jun 22, 2022

It's the test-agglomerate-file dataset with agglomerate_view_70 and segment 13 at position 61, 89, 101.
As far as I can see the request is going to the datastore and the resulting agglomerate has a single node.

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fm3 commented Jun 22, 2022

you are right 🤔 That ay mean that this problem does not happen for multi-dimensional arrays like edges. I wonder what the original bug report was about, then 🧐

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daniel-wer commented Jun 22, 2022

As indicated internally, I think the problem only happens if the edges_offsets point to the end of the edges array. Apparently, jhdf5 then tries to read 0 elements from that index which fails.

I could reproduce the error on master using agglomerate 53 at position 147, 110, 124. This PR fixes the issue 🎉

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LGTM 👍

@fm3 fm3 merged commit 5156a4d into master Jun 22, 2022
@fm3 fm3 deleted the single-segment-agglomerate-skeleton branch June 22, 2022 15:37
hotzenklotz added a commit that referenced this pull request Jun 23, 2022
…type

* 'master' of github.com:scalableminds/webknossos:
  fix error when loading agglomerate skeleton for single-segment agglomerate (#6294)
  Editable Mappings aka Supervoxel Proofreading (#6195)
  Increase maximum interpolation depth to 100 (#6292)
  Add download modal to dataset view actions (#6283)
  Drop "Explorational" from info tab (#6290)
  Allow version history view in annotations not owned by you (#6274)
  Bucket loading meter (#6269)
  Revert "Merge "Shared Annotations" with "My annotations" (#6230)" (#6286)
  Merge "Shared Annotations" with "My annotations" (#6230)
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2 participants