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authorJordan Henderson <jhenderson@hdfgroup.org>2019-02-12 01:15:56 (GMT)
committerJordan Henderson <jhenderson@hdfgroup.org>2019-02-12 01:15:56 (GMT)
commit8f447bd3564a88738b9a26b1b0ac3bba785efd39 (patch)
tree072d3f188b888dc9d5b1215db502af01fd9038e9 /release_docs/RELEASE.txt
parent34508f0620363d90ef3f76b314d52e4b01c20a81 (diff)
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Add RELEASE.txt note for collective metadata read fixes
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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