HDFGroup

Issues somebody may already be working on are listed last. List everything by date

• GCC 15.2: -Wcast-qual warning - cast discards const qualifier from pointer target type (H5trace.c)

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  Difficulty 2/5 1-3 hours Newbie friendliness 73/100

  HDFGroup/hdf5#6878 · Opened Nov 12, 2026

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• GCC 15.2: multiple -Wdiscarded-qualifiers warnings - assignments discard const qualifier from pointer target type

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  Difficulty 3/5 1-2 days Newbie friendliness 55/100

  HDFGroup/hdf5#6877 · Opened Nov 12, 2026

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• GCC 15.2: -Wformat-y2k warning in H5_get_localtime_str ('%c' yields only last 2 digits of year in some locales)

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  Difficulty 1/5 Under an hour Newbie friendliness 82/100

  HDFGroup/hdf5#6876 · Opened Nov 12, 2026

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• h5tojson writes committed datatypes inline, so the reference to the named type is lost

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  bug

  Difficulty 3/5 Half a day Newbie friendliness 45/100

  HDFGroup/hdf5-json#98 · Opened Nov 9, 2026

• spack and conda builds?

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  Difficulty 4/5 1-2 days Newbie friendliness 22/100

  HDFGroup/hdf5_plugins#303 · Opened Oct 31, 2026

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• Decide on appropriate testing methodology for plugins

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  Component - Testing Priority - 2. Medium ⏹ Type - Improvement

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  HDFGroup/hdf5_plugins#299 · Opened Oct 28, 2026

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• [PACKAGING] Native Linux packages via Open Build Service (OBS)

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  Component - Build

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  HDFGroup/hdfview#510 · Opened Oct 20, 2026

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• Fixed-length strings read past the end of their field

  May be free again @mattjala claimed this 30 days ago, and no pull request is open. Open

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  Component - Object Library

  HDFGroup/hdfview#504 · 1 assignee · Opened Oct 13, 2026

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• Compound members vanish when a variable-length string member is NULL

  May be free again @mattjala claimed this 30 days ago, and no pull request is open. Open

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  Component - Object Library

  HDFGroup/hdfview#503 · 1 assignee · Opened Oct 13, 2026

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• Use H5allocate_memory/H5free_memory for buffers exchanged with HDF5 in all filters

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  Difficulty 4/5 3-5 days Newbie friendliness 50/100

  HDFGroup/hdf5_plugins#291 · 1 comment · Opened Oct 13, 2026

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• hdf5_plugins should create lib*.dylib install files

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  Difficulty 3/5 Half a day Newbie friendliness 45/100

  HDFGroup/hdf5_plugins#288 · 1 comment · Opened Oct 13, 2026

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• Add global vs. user-specific install option in MSI

  May be free again @mattjala claimed this 34 days ago, and no pull request is open. Open

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  Component - Build

  HDFGroup/hdfview#495 · 1 assignee · Opened Oct 9, 2026

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• BUG: Detaching a dimension scale after reopening in append mode fails

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  Difficulty 4/5 3-5 days Newbie friendliness 40/100

  HDFGroup/h5pyd#306 · 1 comment · Opened Oct 9, 2026

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• Bug reports by unicorn0016 are now visible after being incorrectly flagged as spam

  May be free again @glennsong09 claimed this 31 days ago, and no pull request is open. Open

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  Difficulty 1/5 Under an hour Newbie friendliness 70/100

  HDFGroup/hdf5#6719 · 1 assignee · Opened Oct 6, 2026

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• `check_required_components()` in HDF5's CMake package configuration file doesn't function

  May be free again @mattjala claimed this 48 days ago, and no pull request is open. Open

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  Component - Build

  Difficulty 2/5 1-3 hours Newbie friendliness 70/100

  HDFGroup/hdf5#6690 · 1 assignee · Opened Sep 24, 2026

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• Flock 0.8.0 group-file race crashes a subscriber during concurrent joins (push_fanout / detector_narrowing benchmarks)

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  Difficulty 1/5 Under an hour Newbie friendliness 15/100

  HDFGroup/vol-stream#1 · 1 comment · Opened Sep 24, 2026

• hdp dumpsds exits 0 after a failed read, silently producing a truncated dump

  May be free again @bmribler claimed this 52 days ago, and no pull request is open. Open

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  HDFGroup/hdf4#925 · 1 assignee · Opened Sep 16, 2026

• H5C__image_stats() uses FUNC_ENTER_NOAPI instead of FUNC_ENTER_PACKAGE, fails its own naming-convention assert

  May be free again @glennsong09 claimed this 59 days ago, and no pull request is open. Open

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  Component - C Library

  Difficulty 1/5 1-3 hours Newbie friendliness 92/100

  HDFGroup/hdf5#6667 · 1 assignee · Opened Sep 11, 2026

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• Request project stance on rust based reimplementations

  May be free again @brtnfld claimed this 62 days ago, and no pull request is open. Open

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  HDFGroup/hdf5#6665 · 4 comments · 1 assignee · Opened Sep 10, 2026

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• Re-rate 4 OSPS Baseline GAP criteria to PARTIAL (BR-01.01, BR-01.02, DO-01.01, DO-02.01)

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  audit

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  HDFGroup/hdf5-ssp-sig#33 · Opened Sep 10, 2026

• the cmake macro SET_HDF_OUTPUT_DIRS behaves unexpected in subprojects

  May be free again @jhendersonHDF claimed this 69 days ago, and no pull request is open. Open

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  HDFGroup/hdf5#6661 · 1 assignee · Opened Sep 4, 2026

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• PRISUPP-2204 case record is internally inconsistent and has unfilled template fields

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  audit

  Difficulty 4/5 3-5 days Newbie friendliness 38/100

  HDFGroup/hdf5-ssp-sig#32 · Opened Sep 1, 2026

• Documentation suggestion - add Java JDK as a prerequisite for recommended preset.

  May be free again @jhendersonHDF claimed this 79 days ago, and no pull request is open. Open

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  Component - Documentation

  HDFGroup/hdf5#6638 · 1 comment · 1 assignee · Opened Aug 23, 2026

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• pickles/*.pk: types with a stored address field have no `_print` method (raw bytes only, not decoded)

  May be free again @vchoi-hdfgroup claimed this 83 days ago, and no pull request is open. Open

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  enhancement

  HDFGroup/hdf5-pickles#83 · 1 assignee · Opened Aug 21, 2026

• Double-clicking handle between/at end of row/column headers doesn't expand their height/width

  May be free again @jhendersonHDF claimed this 83 days ago, and no pull request is open. Open

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  Component - HDFView

  HDFGroup/hdfview#488 · 1 assignee · Opened Aug 19, 2026

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• Click and drag scrolling does not work for ImageViews

  May be free again @mattjala claimed this 83 days ago, and no pull request is open. Open

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  Component - HDFView

  HDFGroup/hdfview#487 · 1 assignee · Opened Aug 19, 2026

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• Double-clicking the expand/collapse arrow for a group gives an error message

  May be free again @jhendersonHDF claimed this 83 days ago, and no pull request is open. Open

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  Component - HDFView

  HDFGroup/hdfview#486 · 1 assignee · Opened Aug 19, 2026

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• Compound dataset column headers aren't collapsable

  May be free again @jhendersonHDF claimed this 83 days ago, and no pull request is open. Open

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  Component - HDFView

  HDFGroup/hdfview#485 · 1 assignee · Opened Aug 19, 2026

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• Option(s) to disable various kinds of external file access

  May be free again @vchoi-hdfgroup claimed this 86 days ago, and no pull request is open. Open

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  Component - C Library

  HDFGroup/hdf5#6618 · 4 comments · 2 reactions · 1 assignee · Opened Aug 18, 2026

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• Rename this repo hdf5-pickles -> h5lens

  May be free again @gheber claimed this 88 days ago, and no pull request is open. Open

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  documentation

  HDFGroup/hdf5-pickles#75 · 1 assignee · Opened Aug 16, 2026

• Onion VFD: page_size on open -- 0 is documented but rejected, and revision 0 with a mismatched value asserts

  May be free again @brtnfld claimed this 86 days ago, and no pull request is open. Open

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  Component - C Library

  HDFGroup/hdf5#6613 · 1 assignee · Opened Aug 15, 2026

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• Onion VFD: revisions silently lost when the file is small relative to page_size

  May be free again @brtnfld claimed this 86 days ago, and no pull request is open. Open

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  Component - C Library

  HDFGroup/hdf5#6612 · 1 assignee · Opened Aug 15, 2026

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• libhdf5 computes a Jenkins checksum for every metadata cache image it writes and never verifies it on read.

  May be free again @jhendersonHDF claimed this 86 days ago, and no pull request is open. Open

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  Component - C Library HDFG-internal

  HDFGroup/hdf5#6611 · 1 assignee · Opened Aug 14, 2026

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• Filter failure segfaults instead of returning an error

  May be free again @fortnern claimed this 93 days ago, and no pull request is open. Open

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  Component - C Library

  HDFGroup/hdf5#6601 · 1 comment · 1 assignee · Opened Aug 7, 2026

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• Both pyproject.toml and requirements.txt have run-time dependencies

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  enhancement

  Difficulty 3/5 1-2 days Newbie friendliness 55/100

  HDFGroup/h5pyd#285 · 1 comment · Opened Aug 2, 2026

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• Parallel Fortran high-level build omits MPI_Fortran_MODULE_DIR and globally applies MPI_C_LINK_FLAGS

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  Component - Build

  HDFGroup/hdf5#6581 · 1 comment · 1 assignee · Opened Jul 30, 2026

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• Proposal: modernize the installed CMake package around stable namespaced targets

  May be free again @mattjala claimed this 100 days ago, and no pull request is open. Open

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  Component - Build

  HDFGroup/hdf5#6580 · 1 comment · 4 reactions · 1 assignee · Opened Jul 30, 2026

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• [CMake] BLOSC2 link errors with ZSTD, LZ4

  May be free again @jhendersonHDF claimed this 101 days ago, and no pull request is open. Open

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  Component - Build

  HDFGroup/hdf5#6577 · 6 comments · 1 assignee · Opened Jul 29, 2026

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• Document how VOL connectors should format object tokens

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  Component - Documentation

  HDFGroup/hdf5#6514 · 1 assignee · Opened Jul 8, 2026

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• H5_daos_term() can leak the H5_DAOS_G_INIT() connector-ID reference outside full library shutdown

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  HDFGroup/vol-daos#74 · Opened Jul 8, 2026

• Support a local policy in h5policy

  May be free again @gheber claimed this 128 days ago, and no pull request is open. Open

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  HDFGroup/hdf5-pickles#45 · 1 assignee · Opened Jul 7, 2026

• Fix javadoc errors

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  Component - Wrappers

  HDFGroup/hdf5#6505 · 1 assignee · Opened Jul 4, 2026

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• H5Fis_accessible(): unable to determine if file is accessible as HDF5

  May be free again @jhendersonHDF claimed this 129 days ago, and no pull request is open. Open

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  HDFGroup/hdf5#6498 · 1 comment · 1 assignee · Opened Jul 1, 2026

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• feholdexcept causes HDF5 initialization to fail

  May be free again @lrknox claimed this 135 days ago, and no pull request is open. Open

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  HDFGroup/hdf5#6493 · 2 reactions · 1 assignee · Opened Jun 29, 2026

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• Provide fast bfloat16 conversion routines as user-registerable examples via H5Tregister

  May be free again @brtnfld claimed this 142 days ago, and no pull request is open. Open

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  HDFGroup/hdf5#6480 · 1 assignee · Opened Jun 22, 2026

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• Slow h5repack performance on a large file

  May be free again @jhendersonHDF claimed this 149 days ago, and no pull request is open. Open

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  Component - Tools

  HDFGroup/hdf5#6458 · 3 comments · 1 assignee · Opened Jun 15, 2026

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• Workflow updates needed for next release

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  Component - Testing

  HDFGroup/hdf5#6452 · 2 assignees · Opened Jun 12, 2026

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• OSS-Fuzz: Proposal: move the OSS-Fuzz fuzzers and build scripts into this repository for upstream maintenance

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  Component - Tools

  HDFGroup/hdf5#6440 · 1 assignee · Opened Jun 11, 2026

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• Prebuilt binary packages use wrong absolute paths

  May be free again @lrknox claimed this 156 days ago, and no pull request is open. Open

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  Component - Misc

  HDFGroup/hdf5#6437 · 1 assignee · Opened Jun 6, 2026

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• error: member access into incomplete type 'const __normal_iterator<const char *, basic_string<char>>'

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  Component - Build

  HDFGroup/hdf5#6436 · 1 assignee · Opened Jun 6, 2026

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