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| <div class="section" id="format-versioning-and-stability"> |
| <h1>Format Versioning and Stability<a class="headerlink" href="#format-versioning-and-stability" title="Permalink to this headline">¶</a></h1> |
| <p>Starting with version 1.0.0, Apache Arrow utilizes |
| <strong>two versions</strong> to describe each release of the project: |
| the <strong>Format Version</strong> and the <strong>Library Version</strong>. Each Library |
| Version has a corresponding Format Version, and multiple versions of |
| the library may have the same format version. For example, library |
| versions 2.0.0 and 3.0.0 may both track format version 1.0.0.</p> |
| <p>For library versions prior to 1.0.0, major releases may contain API |
| changes. From 1.0.0 onward, we follow <a class="reference external" href="https://semver.org/">Semantic Versioning</a> with regards to communicating API changes. We |
| expect most releases to be major library releases.</p> |
| <div class="section" id="backward-compatibility"> |
| <h2>Backward Compatibility<a class="headerlink" href="#backward-compatibility" title="Permalink to this headline">¶</a></h2> |
| <p>A newer versioned client library will be able to read any data and |
| metadata produced by an older client library.</p> |
| <p>So long as the <strong>major</strong> format version is not changed, a newer |
| library is backward compatible with an older library.</p> |
| </div> |
| <div class="section" id="forward-compatibility"> |
| <h2>Forward Compatibility<a class="headerlink" href="#forward-compatibility" title="Permalink to this headline">¶</a></h2> |
| <p>An older client library must be able to either read data generated |
| from a new client library or detect that it cannot properly read the |
| data.</p> |
| <p>An increase in the <strong>minor</strong> version of the format version, such as |
| 1.0.0 to 1.1.0, indicates that 1.1.0 contains new features not |
| available in 1.0.0. So long as these features are not used (such as a |
| new logical data type), forward compatibility is preserved.</p> |
| </div> |
| <div class="section" id="long-term-stability"> |
| <h2>Long-Term Stability<a class="headerlink" href="#long-term-stability" title="Permalink to this headline">¶</a></h2> |
| <p>A change in the format major version (e.g. from 1.0.0 to 2.0.0) |
| indicates a disruption to these compatibility guarantees in some way. |
| We <strong>do not expect</strong> this to be a frequent occurrence. |
| This would be an exceptional |
| event and, should this come to pass, we would exercise caution in |
| ensuring that production applications are not harmed.</p> |
| </div> |
| <div class="section" id="pre-1-0-0-versions"> |
| <h2>Pre-1.0.0 Versions<a class="headerlink" href="#pre-1-0-0-versions" title="Permalink to this headline">¶</a></h2> |
| <p>We made no forward or backward compatibility guarantees for |
| versions prior to 1.0.0. However, we made every effort to ensure |
| that new clients can read serialized data produced by library version |
| 0.8.0 and onward.</p> |
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