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| <h2 title="Class ShardNameTemplate" class="title">Class ShardNameTemplate</h2> |
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| <li>java.lang.Object</li> |
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| <pre>public class <span class="typeNameLabel">ShardNameTemplate</span> |
| extends java.lang.Object</pre> |
| <div class="block">Standard shard naming templates. |
| |
| <p>Shard naming templates are strings that may contain placeholders for the shard number and |
| shard count. When constructing a filename for a particular shard number, the upper-case letters |
| 'S' and 'N' are replaced with the 0-padded shard number and shard count respectively. |
| |
| <p>Left-padding of the numbers enables lexicographical sorting of the resulting filenames. If the |
| shard number or count are too large for the space provided in the template, then the result may |
| no longer sort lexicographically. For example, a shard template of "S-of-N", for 200 shards, will |
| result in outputs named "0-of-200", ... '10-of-200', '100-of-200", etc. |
| |
| <p>Shard numbers start with 0, so the last shard number is the shard count minus one. For |
| example, the template "-SSSSS-of-NNNNN" will be instantiated as "-00000-of-01000" for the first |
| shard (shard 0) of a 1000-way sharded output. |
| |
| <p>A shard name template is typically provided along with a name prefix and suffix, which allows |
| constructing complex paths that have embedded shard information. For example, outputs in the form |
| "gs://bucket/path-01-of-99.txt" could be constructed by providing the individual components: |
| |
| <pre><code> |
| pipeline.apply( |
| TextIO.write().to("gs://bucket/path") |
| .withShardNameTemplate("-SS-of-NN") |
| .withSuffix(".txt")) |
| </code></pre> |
| |
| <p>In the example above, you could make parts of the output configurable by users without the |
| user having to specify all components of the output name. |
| |
| <p>If a shard name template does not contain any repeating 'S', then the output shard count must |
| be 1, as otherwise the same filename would be generated for multiple shards.</div> |
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| <td class="colFirst"><code>static java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/ShardNameTemplate.html#DIRECTORY_CONTAINER">DIRECTORY_CONTAINER</a></span></code> |
| <div class="block">Shard is a file within a directory.</div> |
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| <td class="colFirst"><code>static java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/ShardNameTemplate.html#INDEX_OF_MAX">INDEX_OF_MAX</a></span></code> |
| <div class="block">Shard name containing the index and max.</div> |
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| <h4>INDEX_OF_MAX</h4> |
| <pre>public static final java.lang.String INDEX_OF_MAX</pre> |
| <div class="block">Shard name containing the index and max. |
| |
| <p>Eg: [prefix]-00000-of-00100[suffix] and [prefix]-00001-of-00100[suffix]</div> |
| <dl> |
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| <pre>public static final java.lang.String DIRECTORY_CONTAINER</pre> |
| <div class="block">Shard is a file within a directory. |
| |
| <p>Eg: [prefix]/part-00000[suffix] and [prefix]/part-00001[suffix]</div> |
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