Issues

• Rewrite HDF5 parser in rust?

  dependenciesHDF parserperformancereferences generation
  zarr-developers/VirtualiZarr#1112 · Filter by author TomNicholas opened on Sep 28, 2026
  2

• Concatenate arrays with padded final chunks

  enhancementinternalsreferences generationzarr-pythonzarr-specs
  zarr-developers/VirtualiZarr#1111 · Filter by author TomNicholas opened on Sep 28, 2026

• HDFParser: read variable-length strings and object references at parse time instead of failing

  zarr-developers/VirtualiZarr#1104 · Filter by author ianhi opened on Sep 22, 2026
  1

• last_updated_at should record parse-time or last-modified-time, not write-time

  bugIcechunk 🧊internalsobstorereferences generation
  zarr-developers/VirtualiZarr#1100 · Filter by author maxrjones opened on Sep 17, 2026
  2

• Remove Kerchunk from dependencies where possible

  dependenciesKerchunktesting
  zarr-developers/VirtualiZarr#1099 · Filter by author TomNicholas opened on Sep 16, 2026

• Support GRIB edition 0 / Météo-France FA files

  enhancementhelp wantedreferences generation
  zarr-developers/VirtualiZarr#1093 · Filter by author TomNicholas opened on Aug 31, 2026

• Make obstore optional

  zarr-developers/VirtualiZarr#1092 · Filter by author davidbrochart opened on Aug 28, 2026
  22

• Forbid zero-length chunk references in ChunkManifest

  bugreferences formats
  zarr-developers/VirtualiZarr#1088 · Filter by author TomNicholas opened on Aug 14, 2026

• Dangling pixel concatenation (variable-length chunks)

  usage example
  zarr-developers/VirtualiZarr#1078 · Filter by author jakenotjay opened on Aug 6, 2026
  1

• test_numpy_arrays_to_inlined_kerchunk_refs intermittently deadlocks in CI (kerchunk -> zarr sync under h5py's phil lock)

  zarr-developers/VirtualiZarr#1072 · Filter by author TomNicholas opened on Aug 5, 2026

• Virtualising an AODN/IMOS satellite SST archive (follow-up from #218)

  usage example
  zarr-developers/VirtualiZarr#1059 · Filter by author utas-amberbian opened on Jul 29, 2026
  2

• HDFParser: drop_variables is not propagated into subgroup recursion

  bugHDF parser
  zarr-developers/VirtualiZarr#1057 · Filter by author aladinor opened on Jul 28, 2026
  1

• ZarrParser fails on v2 vlen-utf8 string arrays with no explicit fill_value ('ambiguous object dtype')

  zarr-developers/VirtualiZarr#1053 · Filter by author TomNicholas opened on Jul 24, 2026

• Docs could explain the registry better

  documentation
  zarr-developers/VirtualiZarr#1050 · Filter by author TomNicholas opened on Jul 20, 2026

• xr.concat of virtual datasets silently drops mismatched CF encoding (scale_factor, add_offset, _FillValue)

  bugCF conventionsinternals
  zarr-developers/VirtualiZarr#1004 · Filter by author TomNicholas opened on May 26, 2026
  3

• FillValue decoding unexpected fill_value: null (on version 2.6.1)

  fill-sentinel-values
  zarr-developers/VirtualiZarr#989 · Filter by author dwest77a opened on May 5, 2026
  2

• netcdf3 parser fails to preserve _FillValue attribute

  bugfill-sentinel-valuesKerchunkparsers
  zarr-developers/VirtualiZarr#982 · Filter by author aaron-kaplan opened on Apr 24, 2026

• Add example of Icechunk HTTPS virtual zarr, with caveat about auth

  documentationIcechunk 🧊
  zarr-developers/VirtualiZarr#978 · Filter by author maxrjones opened on Apr 23, 2026
  2

• Feature: Squeeze singleton dimensions in HDFParser

  HDF parser
  zarr-developers/VirtualiZarr#971 · Filter by author maxrjones opened on Apr 15, 2026

• Feature: Support pattern matching in drop_variables for HDFParser

  HDF parser
  zarr-developers/VirtualiZarr#970 · Filter by author maxrjones opened on Apr 15, 2026
  2

• Bug in HDFParser? Different length obtained to h5dump

  bugHDF parser
  zarr-developers/VirtualiZarr#968 · Filter by author charles-turner-1 opened on Apr 14, 2026
  9

• Docs: initializing dataset ahead of region writing

  documentationgood first issue
  zarr-developers/VirtualiZarr#950 · Filter by author tylanderson opened on Mar 30, 2026

• Virtual CMORisation

  zarr-developers/VirtualiZarr#949 · Filter by author charles-turner-1 opened on Mar 30, 2026
  1

• Optimization idea: Files as shards?

  enhancementHDF parserreferences generation
  zarr-developers/VirtualiZarr#947 · Filter by author TomNicholas opened on Mar 26, 2026
  22

• Examples of CI hanging or being flaky/weird

  bugCI
  zarr-developers/VirtualiZarr#933 · Filter by author jbusecke opened on Mar 16, 2026
  3