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limitations.html
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<h1 id="product-limitations">
<a href="#product-limitations" class="anchor-heading"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Product Limitations
</h1>
<p>lakeFS for Databricks is designed to support Delta Lake tables within Unity Catalog, and we are continuously releasing
incremental updates to enhance compatibility with the features of both products. This page outlines the current limitations
in integrating lakeFS with some Delta Lake and Unity Catalog functionalities.</p>
<p class="note"><strong>Note</strong><br />
Please review the information carefully and ensure you adhere to the instructions below to avoid potential issues.</p>
<ol>
<li>No support for <a href="https://docs.databricks.com/en/tables/managed.html">Managed Tables</a>. lakeFS for Databricks currently requires
the use of <a href="https://docs.databricks.com/en/tables/external.html">External tables</a>. Support for Managed tables is a high priority on our roadmap.</li>
<li>No support for following Unity Catalog functionalities:
<ul>
<li><a href="https://docs.databricks.com/en/views/index.html">Views</a></li>
<li><a href="https://docs.databricks.com/en/volumes/index.html">Volumes</a></li>
<li><a href="https://docs.databricks.com/en/udf/unity-catalog.html#">Functions</a></li>
<li><a href="https://docs.databricks.com/en/machine-learning/manage-model-lifecycle/index.html#train-and-register-unity-catalog-compatible-models">Models</a></li>
</ul>
</li>
<li>
<p>No support for Delta Lake <a href="https://docs.databricks.com/en/sql/language-manual/delta-vacuum.html">VACUUM</a>. Vacuum support is on the roadmap.
Until full support is implemented, <strong>do not</strong> run VACUUM on tables managed by lakeFS for Databricks.</p>
<p class="warning">Running VACUUM on these tables may delete reference tables and compromise data versioning.</p>
</li>
<li>No support for <a href="https://docs.delta.io/latest/delta-deletion-vectors.html">Deletion Vectors</a>. If you’re using Delta Lake version
2.3.0 or above, deletion vectors are likely enabled by default. However, lakeFS for Databricks does not support deletion vectors.
To avoid potential issues, ensure deletion vectors are disabled. To check whether deletion vectors are enabled, use the following command:
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="k">SHOW</span> <span class="n">TBLPROPERTIES</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span><span class="p">;</span>
</code></pre></div> </div>
<p>To disable deletion vectors, run:</p>
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'delta.enableDeletionVectors'</span> <span class="o">=</span> <span class="k">false</span><span class="p">);</span>
</code></pre></div> </div>
<p class="warning">Using deletion vectors may result in unexpected table behavior.</p>
</li>
<li>No support for operations done <strong>directly</strong> in lakeFS Cloud. Table CRUD operations or versioning operations, i.e. commits or
branch creation performed directly on lakeFS Cloud are not reflected in Unity Catalog. Use Unity Catalog for table CRUD operations, use
<a href="/cli-reference.html">lakefs-databricks</a> CLI for versioning operations.</li>
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