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| <h1 class="title">TDB xloader</h1> |
| |
| <p>TDB xloader (“x” for external) is a bulkloader for very large datasets. The goal |
| is stability and reliability for long running loading, running on modest |
| hardware and can be use to load a database on rotating disk or SSD.</p> |
| <p><code>xloader</code> is not a replacement for regular TDB1 and TDB2 loaders. It is for very |
| large datasets.</p> |
| <p>There are two scripts to load data using the xloader subsystem.</p> |
| <p>“tdb1.xloader”, which was called “tdbloader2”, has some improvements.</p> |
| <p>It is not as fast as other TDB loaders on datasets where the general loaders work |
| without encountering progressive slowdown.</p> |
| <p>The xloaders for TDB1 and TDB2 are not identical. The TDB2 xloader is more |
| capable; it is based on the same design approach with further refinements to |
| building the node table and to reduce the total amount of temporary file space |
| used.</p> |
| <p>The xloader does not run on MS Windows. It uses an external sort program from |
| unix - <code>sort(1)</code>.</p> |
| <p>The xloader only builds a fresh database from empty. |
| It can not be used to load an existing database.</p> |
| <h3 id="running-xloader">Running xloader</h3> |
| <p><code>tdb2.xloader --loc DIRECTORY</code> FILE…</p> |
| <p>or</p> |
| <p><code>tdb1.xloader --loc DIRECTORY</code> FILE…</p> |
| <p>Additionally, there is an argument <code>--tmpdir</code> to use a different directory for |
| temporary files.</p> |
| <p><code>FILE</code> is any RDF syntax supported by Jena. Syntax is determined by the file |
| extension and can include an addtional “.gz” or “.bz2” for compressed files.</p> |
| <p><code>tdb2.xloader</code> also supports argument <code>--threads</code> to set the number of threads |
| to use with <code>sort(1)</code>. The default is 2. The recommendation for an initial |
| setting is to set it to the number of cores (not hardware threads) minus 1. This |
| is sensitive to the hardware environment. Experimentation may show a different, |
| better setting.</p> |
| <h3 id="advice">Advice</h3> |
| <p>To avoid a load failing due to a syntax or other data error, it is advisable to |
| run <code>riot --check</code> on the data first. Parsing is faster than loading.</p> |
| <p>The TDB databases will take up a lot of disk space and in addition during |
| loading <code>xloader</code> uses a significant amount of temporary disk space.</p> |
| <p>If desired, the data can be converted to <a href="../io/rdf-binary.html">RDF Thrift</a> at |
| this stage by adding <code>--stream rdf-thrift</code> to the riot checking run. Parsing |
| RDF Thrift is faster than parsing N-Triples although the bulk of the loading |
| process is not limited by parser speed.</p> |
| <p>Do not capture the bulk loader output in a file on the same disk as the database |
| or temporary directory; it slows loading down.</p> |
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