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|
HDF5 version 1.10.1 released on 2017-04-27
================================================================================
INTRODUCTION
This document describes the differences between HDF5-1.10.0-patch1 and
HDF5 1.10.1, and contains information on the platforms tested and known
problems in HDF5-1.10.1. For more details check the HISTORY*.txt files
in the HDF5 source.
Links to HDF5 1.10.1 source code, documentation, and additional materials can
be found on The HDF5 web page at:
https://support.hdfgroup.org/HDF5/
The HDF5 1.10.1 release can be obtained from:
https://support.hdfgroup.org/HDF5/release/obtain5.html
User documentation for the snapshot can be accessed directly at this location:
https://support.hdfgroup.org/HDF5/doc/
New features in the HDF5-1.10.x release series, including brief general
descriptions of some new and modified APIs, are described in the "New Features
in HDF5 Release 1.10" document:
https://support.hdfgroup.org/HDF5/docNewFeatures/index.html
All new and modified APIs are listed in detail in the "HDF5 Software Changes
from Release to Release" document, in the section "Release 10.1 (current
release) versus Release 1.10.0
https://support.hdfgroup.org/HDF5/doc/ADGuide/Changes.html
If you have any questions or comments, please send them to the HDF Help Desk:
help@hdfgroup.org
CONTENTS
- Major New Features Introduced in HDF5 1.10.1
- Other New Features and Enhancements
- Support for New Platforms, Languages, and Compilers
- Bug Fixes since HDF5-1.10.0-patch1
- Supported Platforms
- Tested Configuration Features Summary
- More Tested Platforms
- Known Problems
Major New Features Introduced in HDF5 1.10.1
============================================
For links to the RFCs and documentation in this section please view
https://support.hdfgroup.org/HDF5/docNewFeatures in a web browser.
________________________________________
Metadata Cache Image
________________________________________
HDF5 metadata is typically small, and scattered throughout the HDF5 file.
This can affect performance, particularly on large HPC systems. The
Metadata Cache Image feature can improve performance by writing the
metadata cache in a single block on file close, and then populating the
cache with the contents of this block on file open, thus avoiding the many
small I/O operations that would otherwise be required on file open and
close. See the RFC for complete details regarding this feature. Also,
see the Fine Tuning the Metadata Cache documentation.
At present, metadata cache images may not be generated by parallel
applications. Parallel applications can read files with metadata cache
images, but since this is a collective operation, a deadlock is possible
if one or more processes do not participate.
________________________________________
Metadata Cache Evict on Close
________________________________________
The HDF5 library's metadata cache is fairly conservative about holding on
to HDF5 object metadata (object headers, chunk index structures, etc.),
which can cause the cache size to grow, resulting in memory pressure on
an application or system. The "evict on close" property will cause all
metadata for an object to be evicted from the cache as long as metadata
is not referenced from any other open object. See the Fine Tuning the
Metadata Cache documentation for information on the APIs.
At present, evict on close is disabled in parallel builds.
________________________________________
Paged Aggregation
________________________________________
The current HDF5 file space allocation accumulates small pieces of metadata
and raw data in aggregator blocks which are not page aligned and vary
widely in sizes. The paged aggregation feature was implemented to provide
efficient paged access of these small pieces of metadata and raw data.
See the RFC for details. Also, see the File Space Management documentation.
________________________________________
Page Buffering
________________________________________
Small and random I/O accesses on parallel file systems result in poor
performance for applications. Page buffering in conjunction with paged
aggregation can improve performance by giving an application control of
minimizing HDF5 I/O requests to a specific granularity and alignment.
See the RFC for details. Also, see the Page Buffering documentation.
At present, page buffering is disabled in parallel builds.
Other New Features and Enhancements
===================================
Library
-------
- Added a mechanism for disabling the SWMR file locking scheme.
The file locking calls used in HDF5 1.10.0 (including patch1)
will fail when the underlying file system does not support file
locking or where locks have been disabled. To disable all file
locking operations, an environment variable named
HDF5_USE_FILE_LOCKING can be set to the five-character string
'FALSE'. This does not fundamentally change HDF5 library
operation (aside from initial file open/create, SWMR is lock-free),
but users will have to be more careful about opening files
to avoid problematic access patterns (i.e.: multiple writers)
that the file locking was designed to prevent.
Additionally, the error message that is emitted when file lock
operations set errno to ENOSYS (typical when file locking has been
disabled) has been updated to describe the problem and potential
resolution better.
(DER, 2016/10/26, HDFFV-9918)
- The return type of H5Pget_driver_info() has been changed from void *
to const void *.
The pointer returned by this function points to internal library
memory and should not be freed by the user.
(DER, 2016/11/04, HDFFV-10017)
- The direct I/O VFD has been removed from the list of VFDs that
support SWMR.
This configuration was never officially tested and several SWMR
tests fail when this VFD is set.
(DER, 2016/11/03, HDFFV-10169)
Configuration:
--------------
- The minimum version of CMake required to build HDF5 is now 3.2.2.
(ADB, 2017/01/10)
- An --enable/disable-developer-warnings option has been added to
configure.
This disables warnings that do not indicate poor code quality such
as -Winline and gcc's -Wsuggest-attribute. Developer warnings are
disabled by default.
(DER, 2017/01/10)
- A bin/restore.sh script was added that reverts autogen.sh processing.
(DER, 2016/11/08)
- CMake: Added NAMESPACE hdf5:: to package configuration files to allow
projects using installed HDF5 binaries built with CMake to link with
them without specifying the HDF5 library location via IMPORTED_LOCATION.
(ABD, 2016/10/17, HDFFV-10003)
- CMake: Changed the CTEST_BUILD_CONFIGURATION option to
CTEST_CONFIGURATION_TYPE as recommended by the CMake documentation.
(ABD, 2016/10/17, HDFFV-9971)
Fortran Library:
----------------
- The HDF5 Fortran library can now be compiled with the NAG compiler.
(MSB, 2017/2/10, HDFFV-9973)
C++ Library:
------------
- The following C++ API wrappers have been added to the C++ Library:
// Sets/Gets the strategy and the threshold value that the library
// will employ in managing file space.
FileCreatPropList::setFileSpaceStrategy - H5Pset_file_space_strategy
FileCreatPropList::getFileSpaceStrategy - H5Pget_file_space_strategy
// Sets/Gets the file space page size for paged aggregation.
FileCreatPropList::setFileSpacePagesize - H5Pset_file_space_page_size
FileCreatPropList::getFileSpacePagesize - H5Pget_file_space_page_size
// Checks if the given ID is valid.
IdComponent::isValid - H5Iis_valid
// Sets/Gets the number of soft or user-defined links that can be
// traversed before a failure occurs.
LinkAccPropList::setNumLinks - H5Pset_nlinks
LinkAccPropList::getNumLinks - H5Pget_nlinks
// Returns a copy of the creation property list of a datatype.
DataType::getCreatePlist - H5Tget_create_plist
// Opens/Closes an object within a group or a file, regardless of object
// type
Group::getObjId - H5Oopen
Group::closeObjId - H5Oclose
// Maps elements of a virtual dataset to elements of the source dataset.
DSetCreatPropList::setVirtual - H5Pset_virtual
// Gets general information about this file.
H5File::getFileInfo - H5Fget_info2
// Returns the number of members in a type.
IdComponent::getNumMembers - H5Inmembers
// Determines if an element type exists.
IdComponent::typeExists - H5Itype_exists
// Determines if an object exists.
H5Location::exists - H5Lexists.
// Returns the header version of an HDF5 object.
H5Object::objVersion - H5Oget_info for version
(BMR, 2017/03/20, HDFFV-10004, HDFFV-10139, HDFFV-10145)
- New exception: ObjHeaderIException for H5O interface.
(BMR, 2017/03/15, HDFFV-10145)
- New class LinkAccPropList for link access property list, to be used by
wrappers of H5Lexists.
(BMR, 2017/01/04, HDFFV-10145)
- New constructors to open datatypes in ArrayType, CompType, DataType,
EnumType, FloatType, IntType, StrType, and VarLenType.
(BMR, 2016/12/26, HDFFV-10056)
- New member functions:
DSetCreatPropList::setNbit() to setup N-bit compression for a dataset.
ArrayType::getArrayNDims() const
ArrayType::getArrayDims() const
both to replace the non-const versions.
(BMR, 2016/04/25, HDFFV-8623, HDFFV-9725)
Tools:
------
- The following options have been added to h5clear:
-s: clear the status_flags field in the file's superblock
-m: Remove the metadata cache image from the file
(QAK, 2017/03/22, PR#361)
High-Level APIs:
---------------
- Added New Fortran 2003 API for h5tbmake_table_f.
(MSB, 2017/02/10, HDFFV-8486)
Support for New Platforms, Languages, and Compilers
===================================================
- Added NAG compiler
Bug Fixes since HDF5-1.10.0-patch1 release
==================================
Library
-------
- Outdated data structure was used in H5D_CHUNK_DEBUG blocks, causing
compilation errors when H5D_CHUNK_DEBUG was defined. This is fixed.
(BMR, 2017/04/04, HDFFV-8089)
- SWMR implementation in the HDF5 1.10.0 and 1.10.0-patch1 releases has a
broken metadata flush dependency that manifested itself with the following
error at the end of the HDF5 error stack:
H5Dint.c line 846 in H5D__swmr_setup(): dataspace chunk index must be 0
for SWMR access, chunkno = 1
major: Dataset
minor: Bad value
It was also reported at https://github.com/areaDetector/ADCore/issues/203
The flush dependency is fixed in this release.
- Changed the plugins dlopen option from RTLD_NOW to RTLD_LAZY
(ABD, 2016/12/12, PR#201)
- A number of issues were fixed when reading/writing from/to corrupted
files to ensure that the library fails gracefully in these cases:
* Writing to a corrupted file that has an object message which is
incorrectly marked as sharable on disk results in a buffer overflow /
invalid write instead of a clean error message.
* Decoding data from a corrupted file with a dataset encoded with the
H5Z_NBIT decoding can result in a code execution vulnerability under
the context of the application using the HDF5 library.
* When decoding an array datatype from a corrupted file, the HDF5 library
fails to return an error in production if the number of dimensions
decoded is greater than the maximum rank.
* When decoding an "old style" array datatype from a corrupted file, the
HDF5 library fails to return an error in production if the number of
dimensions decoded is greater than the maximum rank.
(NAF, 2016/10/06, HDFFV-9950, HDFFV-9951, HDFFV-9992, HDFFV-9993)
- Fixed an error that would occur when copying an object with an attribute
which is a compound datatype consisting of a variable length string.
(VC, 2016/08/24, HDFFV-7991)
- H5DOappend will no longer fail if a dataset has no append callback
registered.
(VC, 2016/08/14, HDFFV-9960)
- Fixed an issue where H5Pset_alignment could result in misaligned blocks
with some input combinations, causing an assertion failure in debug mode.
(NAF, 2016/08/11, HDFFV-9948)
- Fixed a problem where a plugin compiled into a DLL in the default plugin
directory could not be found by the HDF5 library at runtime on Windows
when the HDF5_PLUGIN_PATH environment variable was not set.
(ABD, 2016/08/01, HDFFV-9706)
- Fixed an error that would occur when calling H5Adelete on an attribute
which is attached to an externally linked object in the target file and
whose datatype is a committed datatype in the main file.
(VC, 2016/07/06, HDFFV-9940)
- (a) Throw an error instead of assertion when v1 btree level hits the 1
byte limit.
(b) Modifications to better handle error recovery when conversion by
h5format_convert fails.
(VC, 2016/05/29, HDFFV-9434)
- Fixed a memory leak where an array used by the library to track SWMR
read retries was unfreed.
The leaked memory was small (on the order of a few tens of ints) and
allocated per-file. The memory was allocated (and lost) only when a
file was opened for SWMR access.
(DER, 2016/04/27, HDFFV-9786)
- Fixed a memory leak that could occur when opening a file for the first
time (including creating) and the call fails.
This occurred when the file-driver-specific info was not cleaned up.
The amount of memory leaked varied with the file driver, but would
normally be less than 1 kB.
(DER, 2016/12/06, HDFFV-10168)
- Fixed a failure in collective metadata writes.
This failure only appeared when collective metadata writes
were enabled (via H5Pset_coll_metadata_write()).
(JRM, 2017/04/10, HDFFV-10055)
Parallel Library
----------------
- Fixed a bug that could occur when allocating a chunked dataset in parallel
with an alignment set and an alignment threshold greater than the chunk
size but less than or equal to the raw data aggregator size.
(NAF, 2016/08/11, HDFFV-9969)
Configuration
-------------
- Configuration will check for the strtoll and strtoull functions
before using alternatives
(ABD, 2017/03/17, PR#340)
- CMake uses a Windows pdb directory variable if available and
will generate both static and shared pdb files.
(ABD, 2017/02/06, HDFFV-9875)
- CMake now builds shared versions of tools.
(ABD, 2017/02/01, HDFFV-10123)
- Makefiles and test scripts have been updated to correctly remove files
created when running "make check" and to avoid removing any files under
source control. In-source builds followed by "make clean" and "make
distclean" should result in the original source files.
(LRK, 2017/01/17, HDFFV-10099)
- The tools directory has been divided into two separate source and test
directories. This resolves a build dependency and, as a result,
'make check' will no longer fail in the tools directory if 'make' was
not executed first.
(ABD, 2016/10/27, HDFFV-9719)
- CMake: Fixed a timeout error that would occasionally occur when running
the virtual file driver tests simultaneously due to test directory
and file name collisions.
(ABD, 2016/09/19, HDFFV-9431)
- CMake: Fixed a command length overflow error by converting custom
commands inside CMakeTest.cmake files into regular dependencies and
targets.
(ABD, 2016/07/12, HDFFV-9939)
- Fixed a problem preventing HDF5 to be built on 32-bit CYGWIN by
condensing cygwin configuration files into a single file and
removing outdated compiler settings.
(ABD, 2016/07/12, HDFFV-9946)
Fortran
--------
- Changed H5S_ALL_F from INTEGER to INTEGER(HID_T)
(MSB, 2016/10/14, HDFFV-9987)
Tools
-----
- h5diff now correctly ignores strpad in comparing strings.
(ABD, 2017/03/03, HDFFV-10128)
- h5repack now correctly parses the command line filter options.
(ABD, 2017/01/24, HDFFV-10046)
- h5diff now correctly returns an error when it cannot read data due
to an unavailable filter plugin.
(ADB 2017/01/18, HDFFV-9994 )
- Fixed an error in the compiler wrapper scripts (h5cc, h5fc, et al.)
in which they would erroneously drop the file argument specified via
the -o flag when the -o flag was specified before the -c flag on the
command line, resulting in a failure to compile.
(LRK, 2016/11/04, HDFFV-9938, HDFFV-9530)
- h5repack User Defined (UD) filter parameters were not parsed correctly.
The UD filter parameters were not being parsed correctly. Reworked coding
section to parse the correct values and verify number of parameters.
(ABD, 2016/10/19, HDFFV-9996, HDFFV-9974, HDFFV-9515, HDFFV-9039)
- h5repack allows the --enable-error-stack option on the command line.
(ADB, 2016/08/08, HDFFV-9775)
C++ APIs
--------
- The member function H5Location::getNumObjs() is moved to
class Group because the objects are in a group or a file only,
and H5Object::getNumAttrs to H5Location to get the number of
attributes at a given location.
(BMR, 2017/03/17, PR#466)
- Due to the change in the C API, the overloaded functions of
PropList::setProperty now need const for some arguments. They are
planned for deprecation and are replaced by new versions with proper
consts.
(BMR, 2017/03/17, PR#344)
- The high-level API Packet Table (PT) did not write data correctly when
the datatype is a compound type that has string type as one of the
members. This problem started in 1.8.15, after the fix of HDFFV-9042
was applied, which caused the Packet Table to use native type to access
the data. It should be up to the application to specify whether the
buffer to be read into memory is in the machine's native architecture.
Thus, the PT is fixed to not use native type but to make a copy of the
user's provided datatype during creation or the packet table's datatype
during opening. If an application wishes to use native type to read the
data, then the application will request that. However, the Packet Table
doesn't provide a way to specify memory datatype in this release. This
feature will be available in future releases.
(BMR, 2016/10/27, HDFFV-9758)
- The obsolete macros H5_NO_NAMESPACE and H5_NO_STD have been removed from
the HDF5 C++ API library.
(BMR, 2016/10/23, HDFFV-9532)
- The problem where a user-defined function cannot access both, attribute
and dataset, using only one argument is now fixed.
(BMR, 2016/10/11, HDFFV-9920)
- In-memory array information, ArrayType::rank and
ArrayType::dimensions, were removed. This is an implementation
detail and should not affect applications.
(BMR, 2016/04/25, HDFFV-9725)
Testing
-------
- Fixed a problem that caused tests using SWMR to occasionally fail when
running "make check" using parallel make.
(LRK, 2016/03/22, PR#338, PR#346, PR#358)
Supported Platforms
===================
Linux 2.6.32-573.18.1.el6.ppc64 gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
#1 SMP ppc64 GNU/Linux g++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
(ostrich) GNU Fortran (GCC) 4.4.7 20120313
(Red Hat 4.4.7-4)
IBM XL C/C++ V13.1
IBM XL Fortran V15.1
Linux 3.10.0-327.10.1.el7 GNU C (gcc), Fortran (gfortran), C++ (g++)
#1 SMP x86_64 GNU/Linux compilers:
(kituo/moohan) Version 4.8.5 20150623 (Red Hat 4.8.5-4)
Version 4.9.3, Version 5.2.0
Intel(R) C (icc), C++ (icpc), Fortran (icc)
compilers:
Version 15.0.3.187 Build 20150407
MPICH 3.1.4 compiled with GCC 4.9.3
SunOS 5.11 32- and 64-bit Sun C 5.12 SunOS_sparc
(emu) Sun Fortran 95 8.6 SunOS_sparc
Sun C++ 5.12 SunOS_sparc
Windows 7 Visual Studio 2012 w/ Intel Fortran 15 (cmake)
Visual Studio 2013 w/ Intel Fortran 15 (cmake)
Visual Studio 2015 w/ Intel Fortran 16 (cmake)
Windows 7 x64 Visual Studio 2012 w/ Intel Fortran 15 (cmake)
Visual Studio 2013 w/ Intel Fortran 15 (cmake)
Visual Studio 2015 w/ Intel Fortran 16 (cmake)
Visual Studio 2015 w/ MSMPI 8 (cmake)
Cygwin(CYGWIN_NT-6.1 2.8.0(0.309/5/3)
gcc and gfortran compilers (GCC 5.4.0)
(cmake and autotools)
Windows 10 Visual Studio 2015 w/ Intel Fortran 16 (cmake)
Cygwin(CYGWIN_NT-6.1 2.8.0(0.309/5/3)
gcc and gfortran compilers (GCC 5.4.0)
(cmake and autotools)
Windows 10 x64 Visual Studio 2015 w/ Intel Fortran 16 (cmake)
Mac OS X Mt. Lion 10.8.5 Apple clang/clang++ version 5.1 from Xcode 5.1
64-bit gfortran GNU Fortran (GCC) 4.8.2
(swallow/kite) Intel icc/icpc/ifort version 15.0.3
Mac OS X Mavericks 10.9.5 Apple clang/clang++ version 6.0 from Xcode 6.2
64-bit gfortran GNU Fortran (GCC) 4.9.2
(wren/quail) Intel icc/icpc/ifort version 15.0.3
Mac OS X Yosemite 10.10.5 Apple clang/clang++ version 6.1 from Xcode 7.0
64-bit gfortran GNU Fortran (GCC) 4.9.2
(osx1010dev/osx1010test) Intel icc/icpc/ifort version 15.0.3
Mac OS X El Capitan 10.11.6 Apple clang/clang++ version 7.3 from Xcode 7.3
64-bit gfortran GNU Fortran (GCC) 5.2.0
(osx1010dev/osx1010test) Intel icc/icpc/ifort version 16.0.2
Tested Configuration Features Summary
=====================================
In the tables below
y = tested
n = not tested in this release
C = Cluster
W = Workstation
x = not working in this release
dna = does not apply
( ) = footnote appears below second table
<blank> = testing incomplete on this feature or platform
Platform C F90/ F90 C++ zlib SZIP
parallel F2003 parallel
Solaris2.11 32-bit n y/y n y y y
Solaris2.11 64-bit n y/n n y y y
Windows 7 y y/y n y y y
Windows 7 x64 y y/y y y y y
Windows 7 Cygwin n y/n n y y y
Windows 7 x64 Cygwin n y/n n y y y
Windows 10 y y/y n y y y
Windows 10 x64 y y/y n y y y
Mac OS X Mountain Lion 10.8.5 64-bit n y/y n y y y
Mac OS X Mavericks 10.9.5 64-bit n y/y n y y y
Mac OS X Yosemite 10.10.5 64-bit n y/y n y y y
Mac OS X El Capitan 10.11.6 64-bit n y/y n y y y
CentOS 7.2 Linux 2.6.32 x86_64 PGI n y/y n y y y
CentOS 7.2 Linux 2.6.32 x86_64 GNU y y/y y y y y
CentOS 7.2 Linux 2.6.32 x86_64 Intel n y/y n y y y
Linux 2.6.32-573.18.1.el6.ppc64 n y/y n y y y
Platform Shared Shared Shared Thread-
C libs F90 libs C++ libs safe
Solaris2.11 32-bit y y y y
Solaris2.11 64-bit y y y y
Windows 7 y y y y
Windows 7 x64 y y y y
Windows 7 Cygwin n n n y
Windows 7 x64 Cygwin n n n y
Windows 10 y y y y
Windows 10 x64 y y y y
Mac OS X Mountain Lion 10.8.5 64-bit y n y y
Mac OS X Mavericks 10.9.5 64-bit y n y y
Mac OS X Yosemite 10.10.5 64-bit y n y y
Mac OS X El Capitan 10.11.6 64-bit y n y y
CentOS 7.2 Linux 2.6.32 x86_64 PGI y y y n
CentOS 7.2 Linux 2.6.32 x86_64 GNU y y y y
CentOS 7.2 Linux 2.6.32 x86_64 Intel y y y n
Linux 2.6.32-573.18.1.el6.ppc64 y y y n
Compiler versions for each platform are listed in the preceding
"Supported Platforms" table.
More Tested Platforms
=====================
The following platforms are not supported but have been tested for this release.
Linux 2.6.32-573.22.1.el6 GNU C (gcc), Fortran (gfortran), C++ (g++)
#1 SMP x86_64 GNU/Linux compilers:
(mayll/platypus) Version 4.4.7 20120313
Version 4.8.4
PGI C, Fortran, C++ for 64-bit target on
x86-64;
Version 16.10-0
Intel(R) C (icc), C++ (icpc), Fortran (icc)
compilers:
Version 15.0.3.187 (Build 20150407)
MPICH 3.1.4 compiled with GCC 4.9.3
Linux 3.10.0-327.18.2.el7 GNU C (gcc) and C++ (g++) compilers
#1 SMP x86_64 GNU/Linux Version 4.8.5 20150623 (Red Hat 4.8.5-4)
(jelly) with NAG Fortran Compiler Release 6.1(Tozai)
Intel(R) C (icc) and C++ (icpc) compilers
Version 15.0.3.187 (Build 20150407)
with NAG Fortran Compiler Release 6.1(Tozai)
Linux 2.6.32-573.18.1.el6.ppc64 MPICH mpich 3.1.4 compiled with
#1 SMP ppc64 GNU/Linux IBM XL C/C++ for Linux, V13.1
(ostrich) and IBM XL Fortran for Linux, V15.1
Debian 8.4 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1 x86_64 GNU/Linux
gcc, g++ (Debian 4.9.2-10) 4.9.2
GNU Fortran (Debian 4.9.2-10) 4.9.2
(cmake and autotools)
Fedora 24 4.7.2-201.fc24.x86_64 #1 SMP x86_64 x86_64 x86_64 GNU/Linux
gcc, g++ (GCC) 6.1.1 20160621
(Red Hat 6.1.1-3)
GNU Fortran (GCC) 6.1.1 20160621
(Red Hat 6.1.1-3)
(cmake and autotools)
Ubuntu 16.04.1 4.4.0-38-generic #57-Ubuntu SMP x86_64 GNU/Linux
gcc, g++ (Ubuntu 5.4.0-6ubuntu1~16.04.2)
5.4.0 20160609
GNU Fortran (Ubuntu 5.4.0-6ubuntu1~16.04.2)
5.4.0 20160609
(cmake and autotools)
Known Problems
==============
At present, metadata cache images may not be generated by parallel
applications. Parallel applications can read files with metadata cache
images, but since this is a collective operation, a deadlock is possible
if one or more processes do not participate.
Known problems in previous releases can be found in the HISTORY*.txt files
in the HDF5 source. Please report any new problems found to
help@hdfgroup.org.
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