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new 96481c6 Deployed 349e8e304 with MkDocs version: 1.0.4
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commit 96481c6e049a70bb09aecc14aa7231edf6b5929f
Author: Ryan Blue <[email protected]>
AuthorDate: Tue Jul 14 16:14:07 2020 -0800
Deployed 349e8e304 with MkDocs version: 1.0.4
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spark/index.html | 5 +++++
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<!--
MkDocs version : 1.0.4
-Build Date UTC : 2020-07-15 00:08:13
+Build Date UTC : 2020-07-15 00:14:07
-->
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@@ -726,6 +726,11 @@ spark.sql("""select count(1) from
table""").show()
<h3 id="insert-overwrite"><code>INSERT OVERWRITE</code><a class="headerlink"
href="#insert-overwrite" title="Permanent link">¶</a></h3>
<p>To replace data in the table with the result of a query, use <code>INSERT
OVERWRITE</code>. Overwrites are atomic operations for Iceberg tables.</p>
<p>The partitions that will be replaced by <code>INSERT OVERWRITE</code>
depends on Spark’s partition overwrite mode and the partitioning of a
table.</p>
+<div class="admonition warning">
+<p class="admonition-title">Warning</p>
+<p>Spark 3.0.0 has a correctness bug that affects dynamic <code>INSERT
OVERWRITE</code> with <a href="../partitioning">hidden partitioning</a>, <a
href="https://issues.apache.org/jira/browse/SPARK-32168";>SPARK-32168</a>.
+For tables with hidden partitions, wait for Spark 3.0.1.</p>
+</div>
<h4 id="overwrite-behavior">Overwrite behavior<a class="headerlink"
href="#overwrite-behavior" title="Permanent link">¶</a></h4>
<p>Spark’s default overwrite mode is <strong>static</strong>, but
<strong>dynamic overwrite mode is recommended when writing to Iceberg
tables.</strong> Static overwrite mode determines which partitions to overwrite
in a table by converting the <code>PARTITION</code> clause to a filter, but the
<code>PARTITION</code> clause can only reference table columns.</p>
<p>Dynamic overwrite mode is configured by setting
<code>spark.sql.sources.partitionOverwriteMode=dynamic</code>.</p>
