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| <h1 id="split">split</h1> |
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| <h3 id="name">Name</h3> |
| <p><code>index-split</code> - Splits an index into multiple equal parts.</p> |
| <h3 id="synopsis">Synopsis</h3> |
| <p><code>lucene index split <OUTPUT_DIRECTORY> <INPUT_DIRECTORY>[ <INPUT_DIRECTORY_2>...] [-n|--number-of-parts] [-s|--sequential] [?|-h|--help]</code></p> |
| <h3 id="description">Description</h3> |
| <p>Splits the input index into multiple equal parts. The method employed here uses <code>IndexWriter.AddIndexes(IndexReader[])</code> where the input data comes from the input index with artificially applied deletes to the document ids that fall outside the selected partition.</p> |
| <p>Deletes are only applied to a buffered list of deleted documents and don't affect the source index. This tool works also with read-only indexes.</p> |
| <p>The disadvantage of this tool is that source index needs to be read as many times as there are parts to be created. The multiple passes may be slow.</p> |
| <blockquote><p><strong>NOTE:</strong> This tool is unaware of documents added automatically via <code>IndexWriter.AddDocuments(IEnumerable&lt;IEnumerable&lt;IIndexableField&gt;&gt;, Analyzer)</code> or <code>IndexWriter.UpdateDocuments(Term, IEnumerable&lt;IEnumerable&lt;IIndexableField&gt;&gt;, Analyzer)</code>, which means it can easily break up such document groups.</p> |
| </blockquote> |
| <h3 id="arguments">Arguments</h3> |
| <p><code>OUTPUT_DIRECTORY</code></p> |
| <p>Path to output directory to contain partial indexes.</p> |
| <p><code>INPUT_DIRECTORY, INPUT_DIRECTORY_2</code></p> |
| <p>The path of the source index, which can have deletions and can have multiple segments (or multiple readers). Multiple values can be supplied separated by a space.</p> |
| <h3 id="options">Options</h3> |
| <p><code>?|-h|--help</code></p> |
| <p>Prints out a short help for the command.</p> |
| <p><code>-n|--number-of-parts <NUMBER></code></p> |
| <p>The number of parts (output indices) to produce. If omitted, defaults to 2.</p> |
| <p><code>-s|--sequential</code></p> |
| <p>Sequential doc-id range split (default is round-robin).</p> |
| <h3 id="example">Example</h3> |
| <p>Split the index located at <code>X:\old-index\</code> sequentially, placing the resulting 2 indices into the <code>X:\new-index\</code> directory:</p> |
| <p><code>lucene index split X:\new-index X:\old-index --sequential</code></p> |
| <p>Split the index located at <code>T:\in\</code> into 4 parts and place them into the <code>T:\out\</code> directory:</p> |
| <p><code>lucene index split T:\out T:\in -n 4</code></p> |
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