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<h1 class="title topictitle1" id="ariaid-title1">S3_SKIP_INSERT_STAGING Query Option (<span class="keyword">Impala 2.6</span> or higher only)</h1>
<div class="body conbody">
<p class="p">
</p>
<p class="p">
Speeds up <code class="ph codeph">INSERT</code> operations on tables or partitions residing on the
Amazon S3 filesystem. The tradeoff is the possibility of inconsistent data left behind
if an error occurs partway through the operation.
</p>
<p class="p">
By default, Impala write operations to S3 tables and partitions involve a two-stage process.
Impala writes intermediate files to S3, then (because S3 does not provide a <span class="q">"rename"</span>
operation) those intermediate files are copied to their final location, making the process
more expensive as on a filesystem that supports renaming or moving files.
This query option makes Impala skip the intermediate files, and instead write the
new data directly to the final destination.
</p>
<p class="p">
<strong class="ph b">Usage notes:</strong>
</p>
<div class="note important note_important"><span class="note__title importanttitle">Important:</span>
<p class="p">
If a host that is participating in the <code class="ph codeph">INSERT</code> operation fails partway through
the query, you might be left with a table or partition that contains some but not all of the
expected data files. Therefore, this option is most appropriate for a development or test
environment where you have the ability to reconstruct the table if a problem during
<code class="ph codeph">INSERT</code> leaves the data in an inconsistent state.
</p>
</div>
<p class="p">
The timing of file deletion during an <code class="ph codeph">INSERT OVERWRITE</code> operation
makes it impractical to write new files to S3 and delete the old files in a single operation.
Therefore, this query option only affects regular <code class="ph codeph">INSERT</code> statements that add
to the existing data in a table, not <code class="ph codeph">INSERT OVERWRITE</code> statements.
Use <code class="ph codeph">TRUNCATE TABLE</code> if you need to remove all contents from an S3 table
before performing a fast <code class="ph codeph">INSERT</code> with this option enabled.
</p>
<p class="p">
Performance improvements with this option enabled can be substantial. The speed increase
might be more noticeable for non-partitioned tables than for partitioned tables.
</p>
<p class="p">
<strong class="ph b">Type:</strong> Boolean; recognized values are 1 and 0, or <code class="ph codeph">true</code> and
<code class="ph codeph">false</code>; any other value interpreted as <code class="ph codeph">false</code>
</p>
<p class="p">
<strong class="ph b">Default:</strong> <code class="ph codeph">true</code> (shown as 1 in output of <code class="ph codeph">SET</code>
statement)
</p>
<p class="p">
<strong class="ph b">Added in:</strong> <span class="keyword">Impala 2.6.0</span>
</p>
<p class="p">
<strong class="ph b">Related information:</strong>
</p>
<p class="p">
<a class="xref" href="impala_s3.html#s3">Using Impala with Amazon S3 Object Store</a>
</p>
</div>
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