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|
<html>
<head><title>
HDF5 Format Compatibility
</title>
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<a href="../index.html">HDF5 documents and links</a> <br>
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<h1>New Features in HDF5 Release 1.8.0
and Format Compatibility Considerations</h1>
</div>
<a name="FormatCompatIntro"> </a>
<h3>1. Introduction</h3>
This document discusses backward/forward file format compatibility,
features introduced in HDF5 Release 1.8.0, and corresponding APIs
that may trigger these features and corresponding incompatibility.
<p>
Forward compatibility relates to the ability of an older HDF5 Library
to read files created by a newer HDF5 Library. An older library should
be able to read objects that are known to that library in a file
created by Release 1.8.0. This document includes a list of features
that are designed to create no forward compatibility problems;
a forward compatibility failure with one of these features is a bug.
<p>
Backward compatibility relates to the ability of a newer HDF5 Library
to read files created by an older HDF5 Library.
E.g., if HDF5 Release 1.8.0 is unable to read files created by
Release 1.6.5, that is a backward compatibility failure.
An HDF5 design criterion is that the HDF5 Library is always
backwardly compatible. A backward compatibilty failure is a bug.
<p>
The table below lists features introduced in HDF5 Release 1.8.0
and the objects they may act on,
then indicates combinations in which compatibility conflicts
might arise. Some features will always create objects
or write data that will be incompatible with older versions of the library;
others will do so only under certain circumstances.
<p>
<strong>
Related document
</strong>
<p>
<a href="../RM/APICompatMacros.html"><cite> API Compatibility Macros
in HDF5</cite></a> discusses
configurable function macros that were introduced in
HDF5 Release 1.8.0 to facilitate the adaptation of applications
to that and future releases,
criteria for selecting specific configurations, and
steps required to set them up.
<p>
Whereas <cite>New Features in HDF5 Release 1.8.0 and Format Compatibility
Considerations</cite> discusses format compatibility issues to consider
when applications using HDF5 Release 1.8.0 (or a later release) will create
files that might have to be read using older versions of the HDF5 Library,
<cite>API Compatibility Macros in HDF5</cite> discusses an approach
to resolving API compatibility issues when moving an application
to that release (or a later release).
<p>
<strong>
Reading the table
</strong>
<p>
New features in HDF5 Release 1.8.0
are listed across the top of the table.
<p>
Objects in an HDF5 file that features might affect format compatibility
are listed on the left-hand side. If the object is printed in bold,
the symbols across the row indicate the effect that the feature
has when it acts directly on that object.
Associated with several objects are one or more objects
indented to the right and printed in normal typeface;
ripple effects of a feature may affect these objects
when the feature acts on the related bold-faced object.
<p>
Consider the intersection of the <i>Attribute</i> lines and
<i>Attribute and object headers</i> features.
The symbols on the <i>Attribute</i> line indicate the effect of the
feature when it acts on an attribute;
the symbols on the <i>Object</i> line, immediately below,
indicate the effect of the feature on an HDF5 object
when the feature acts on an attribute attached to that object.
For example, the table indicates that attribute creation order
can be tracked and indexed with the HDF5 Release 1.8.0 Library
only with new-format attributes, and those attr
ibutes will not be readable by older libraries.
The table further indicates that an object
to which such attributes are attached (a dataset, for example)
will therefore be unreadable by an older HDF5 library.
<p>
<div align=center>
<a href="CompatFormat1_ReadKey.png" border=0>
<img src="CompatFormat1_ReadKey.png" width=300 alt="How to read symbolic key to table" border=0>
</a>
</div>
<p>
<a name="FormatConcernsTable"> </a>
</p>
<h3>2. A Summary Table
<br>
<font size=-1>New Features in HDF5 Release 1.8.0 and Their Impact on Format Compatibility</font>
</h3>
The table below lists new features in HDF5 Release 1.8.0
that may create forward-compatibility conflicts.
Objects created or modified with any of these features
may be inaccessible via HDF5 Libraries prior to Release 1.8.0.
<p>
See
<a href="#FormatCompatibitlityConcerns">section 3</a>,
“<a href="#FormatCompatibitlityConcerns">Features that may create
(or are known to create) compatibility concerns</a>,”
for further explanation of these functions and
their format compatiblity implications.
<p>
<div align=right>
<a href="HDF5_CompatFormat180_Concerns.pdf" border=0>
<img src="CompatFormat2_Key.png" width=500 alt="Key for reading table" border=0>
</a>
</div>
<p>
<div align=center>
<a href="HDF5_CompatFormat180_Concerns.pdf" border=0>
<img src="CompatFormat3_UserTable.png" width=700 alt="Table of features
that can create compatibility concerns" border=0>
</a>
</div>
<p>
<strong>Table footnotes:</strong>
<ol>
<li> Under the new implementation,
links may be stored as messages in an object header
or in a type-2 B-tree in the group's local heap.
<br>
<li> By default, a datatype is stored as a message
in the object header; a named datatype,
which may be shared by several datasets,
is stored as an independent object in the file.
<br>
<li> Several new features do not involve new or changed APIs.
<br>
<li> The following elements are stored (or can be stored;
see notes 2 and 3) as messages in an object header.
<br>
<li> These APIs create coordinated sets of objects and metadata.
Though individual elements are quite likely to be accessible
through an older HDF5 library, that library will have
no means of understanding the relationships among the various pieces.
<br>
<li> Compatibility problems will arise only if an application
or the HDF5 Library crashed without properly closing a file with
which this functionality was being used.
<!--
<br>
<li> An API that was simply missing;
old libraries always could read the datatype.
-->
</ol>
<!--
<p>
Notes to reviewers:
This entire chart is data-only; if we wish to discuss
backward-forward application compatibility,
that would have to be a separate issue.
-->
<p>
An expanded table
[<a href="HDF5_CompatFormat180_AllFeatures.pdf">PDF</a>,
large format (11x17 inches)] is available,
listing all new features in Release 1.8.0,
including features that create no format compatibility issues.
These additional features are described more fully in
<a href="#NoIncompatibilities">section 4</a>,
“<a href="#NoIncompatibilities">Features that are designed
to create no compatibility concerns</a>.”
<p>
<a name="FormatCompatibitlityConcerns"> </a>
</p>
<h3>3. Features that may create (or are known to create)
compatibility concerns</h3>
The following HDF5 Release 1.8.0 features may create
new HDF5 objects that cannot be read by an older
HDF5 Library or modify existing objects such that
they cannot be read by an older HDF5 Library.
<dir>
<dl>
<dt>
<strong>
General features
</strong>
<dt>
Object creation using <i>latest available format</i>, specified
via the <code>H5Pset_libver_bounds</code> function.
<dd>
When <code>H5Pset_libver_bounds</code> is called with the
<code>low</code> argument equal to <code>HDF_LIBVER_LATEST</code>,
new objects are created using the latest available format versions.
<p>
This is a file access property, so this object creation behavior
can be set for any existing file, and can vary according to
application needs each time a file is opened.
<p>
Functions:
<br>
<code>H5Pset_libver_bounds( hid_t fapl_id, H5F_libver_t low, H5F_libver_t high )</code>
<br>
<code>H5Pget_libver_bounds( hid_t fapl_id, H5F_libver_t* low, H5F_libver_t* high )</code>
<p>
Default behavior: If <code>H5Pset_libver_bounds</code> is not called with <code>low</code> equal to
<code>HDF_LIBVER_LATEST</code>, then the HDF5 Library provides the greatest-possible format
compatibility. It does this by creating objects with the earliest possible format that
will handle the data being stored and accommodate the action being taken.
<!--
<p>
Compatibility considerations:
<br>
<<i>What are the incompatibilities, how do they arise,
and what might be the consequences?</i>>
-->
</p>
<dt>
<strong>
Groups and links
</strong>
<dt>
Configurable compact-or-indexed link storage
(compact and large groups; new group implementation)
<dd>
Compact-or-indexed groups enable much-compressed link
storage for groups with very few members and
improved efficiency and performance for groups
with very large numbers of members.
The efficiency and performance impacts are most noticeable
at the extremes: all unnecessary overhead is eliminated
for groups with zero members; groups with
tens of thousands of members may see as much as
a 100-fold performance gain.
<p>
This new group implementation also enables user-defined
and external links.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
<br>
<<i>What are the incompatibilities, how do they arise,
and what might be the consequences?</i>>
-->
</p>
<dt>
User-defined (UD) and external links
<dd>
User-defined links enable fully-customizable linking
in an HDF5 file. External links enable the insertion
of a link into an HDF5 group in one file that points
to an HDF5 object in a different HDF5 file.
In part to provide a model for application developers,
external links are implemented as an example of a
user-defined link.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Link creation order tracking and indexing
<dd>
Links can now be tracked and indexed by creation order.
Links can be accessed according to an index by
creation order or an index by name.
<p>
Note: Link indexing by name is inherent to the
HDF5 implementation and requires no special setting.
<!--
<p>
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
<strong>
Attributes and object headers
</strong>
<dt>
Faster access to large numbers of attributes
<dd>
Attribute handling is improved for large numbers of
attributes attached to a single object.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Large attributes (over ~64k)
<dd>
Very large attributes (generally larger than 64KB)
can be attached to an object.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Attribute creation order tracking and indexing
<dd>
Attributes can now be tracked and indexed
by creation order. Attributes can be accessed according
to an index by creation order or an index by name.
<p>
(Note: Attribute indexing by name is inherent to the
HDF5 implementation and requires no special setting.)
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Shared object header messages (SOHM)
<dd>
This feature enables the sharing of object header messages
(attributes, datatypes, fill values, simple dataspaces,
filter pipelines) when they are identical across
multiple objects. For example, if a large text attribute
is attached to many datasets or groups, that attribute
can be saved once in the file with only a pointer from
each dataset or group.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
<strong>
Miscellaneous
</strong>
<dt>
UNICODE support (UTF-8; non-ASCII character set encoding)
<dd>
Non-ASCII character sets are supported for
character strings and link names.
<p>
The current implementation includes the
ASCII and UTF-8 standard character sets.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Object creation or copying with
<i>create intermediate groups</i> property
<dd>
Use of the <i>create intermediate groups</i> property
enables the creation of any groups in the
specified path that do not yet exist in the file
when creating a new object or copying an
existing object in an HDF5 file.
<p>
Note that when this property is set, any
missing intermediate groups are created
with the properties of the lowest-level,
previously existing existing group.
I.e., if the object elf is being created at
<code>FILE:/a1/b543/cde/d12/elf</code>,
and only groups <code>a1</code> and <code>b543</code>
in that hierarchy exist in <code>FILE</code>,
groups <code>cde</code> and <code>d12</code>
will be created with the properties of the
group <code>b543</code>.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Anonymous object creation
<dd>
Objects can be created anonymously in a file,
i.e., without a location or name, with
<code>H5Dcreate_anon</code>, <code>H5Gcreate_anon</code>,
or <code>H5Tcommit_anon</code>.
<p>
If the object is to be preserved in the file,
it must then be linked to a location in the file with
<code>H5Llink</code> before the file is closed.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
Compression filters: N-bit and scale-offset
<dd>
Two new compression filters are provided:
an n-bit filter and a scale-offset filter.
<p>
The n-bit filter compresses data from the
in-memory datatype to an n-bit datatype in the file.
Since data is normally byte- or word-aligned in memory,
this can result in substantial savings in the size
of stored data.
<p>
The scale-offset filter performs a scale and/or
offset operation on each data value and truncates
the resulting value to a minimum number of bits
before storing it.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</p>
<dt>
NULL dataspaces (<code>H5Screate</code>) (3)
<dd>
The <code>H5S_NULL</code> dataspace class allows an application
to use <code>H5Screate</code> to define a dataset or
attribute dataspace with no elements.
<p>
This feature is implemented through the addition
of a NULL dataspace, <code>H5S_NULL</code>,
to the set of valid dataspace classes.
<p>
<!--
Functions:
<p>
Default behavior:
<p>
Compatibility considerations:
-->
</dl>
</dir>
<p>
<a name="NoIncompatibilities"> </a>
</p>
<h3>4. Features that are designed to create no compatibility concerns</h3>
The following HDF5 Release 1.8.0 features are designed
to create no forward compatibilty conflicts;
an older HDF5 Library should always be able to read
and manipulate objects that they create or modify.
</p>
<dir>
<dl>
<dt>
<strong>
Groups and links
</strong>
<dt>
Link APIs (H5L) unrelated to user-defined (UD) and external links
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
-->
<p>
<dt>
<strong>
Attributes and object headers
</strong>
<dt>
Enhanced attribute handling
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Enhanced local heap size management (meta data for group)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
-->
<p>
<dt>
<strong>
Miscellaneous
</strong>
<dt>
Object API (H5O)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Object copy properties
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Improved object information retrieval
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Name of referenced object
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
New-style object open and object creation functions
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
User-defined identifiers
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Other identifier API (H5I) enhancements
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
User-defined datatype conversion callback functions
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Datatype compiler conversion check
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Integer-to-floating-point conversion support (H5Tconvert) (3)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Dataset array size reduction (H5Dset_extent)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Dataspace equivalence (H5Sextent_equal)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Direct I/O, bypassing system cache
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Parallel I/O optimization (collective chunk I/O)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Enhanced error handling (H5E)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Meta data cache management (6)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
File read/write status (H5Fget_intent)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Arithmetic data transform on I/O
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Dataspace and datatype serial conversion
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
-->
<p>
<dt>
<strong>
High-level APIs
</strong>
<dt>
Two-way conversion between datatype and text description
of datatype (H5LT)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
New attribute datatype: long long (H5LT)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Dimension Scale API (H5DS) (5)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Packet Table API (H5PT) (5)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
<dt>
Fortran APIs for HDF5 Light, Image, and Table interfaces
(H5LT, H5IM, and H5TB)
<dd>
<!--
<<i>description</i>>
<p>
Functions:
<p>
Default behavior:
</p>
-->
</dl>
</dir>
<p>
</p>
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<a href="../index.html">HDF5 documents and links</a> <br>
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<td valign=top align=right>
<a href="../UG/index.html">HDF5 User's Guide</a> <br>
<a href="../RM/RM_H5Front.html">HDF5 Reference Manual</a> <br>
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<table width="100%" border="0">
<tr valign="top">
<td align="left">
<address>
The HDF Group Help Desk: <img src="../Graphics/help.png" align=top height=16>
<br>
Describes HDF5 Release 1.8.13, May 2014.
</address>
</td><td width="5%"> </td>
<td align="right">
<a href="../Copyright.html">Copyright</a> by
<a href="http://www.hdfgroup.org">The HDF Group</a>
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