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| author | Jordan Henderson <jhenderson@hdfgroup.org> | 2019-02-12 01:15:56 (GMT) |
|---|---|---|
| committer | Jordan Henderson <jhenderson@hdfgroup.org> | 2019-02-12 01:15:56 (GMT) |
| commit | 8f447bd3564a88738b9a26b1b0ac3bba785efd39 (patch) | |
| tree | 072d3f188b888dc9d5b1215db502af01fd9038e9 /release_docs | |
| parent | 34508f0620363d90ef3f76b314d52e4b01c20a81 (diff) | |
| download | hdf5-8f447bd3564a88738b9a26b1b0ac3bba785efd39.zip hdf5-8f447bd3564a88738b9a26b1b0ac3bba785efd39.tar.gz hdf5-8f447bd3564a88738b9a26b1b0ac3bba785efd39.tar.bz2 | |
Add RELEASE.txt note for collective metadata read fixes
Diffstat (limited to 'release_docs')
| -rw-r--r-- | release_docs/RELEASE.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index ef3bda0..316798d 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -264,6 +264,22 @@ Bug Fixes since HDF5-1.10.3 release Library ------- + - Fix hangs with collective metadata reads during chunked dataset I/O + + In the parallel library, it was discovered that when a particular + sequence of operations following a pattern of: + + "write to chunked dataset" -> "flush file" -> "read from dataset" + + occurred with collective metadata reads enabled, hangs could be + observed due to certain MPI ranks not participating in the collective + metadata reads. + + To fix the issue, collective metadata reads are now disabled during + chunked dataset raw data I/O. + + (JTH - 2019/02/11, HDFFV-10563, HDFFV-10688) + - Performance issue when closing an object The slow down is due to the search of the "tag_list" to find |