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| <h1 id="comparison-of-batch-ingestion-methods">Comparison of Batch Ingestion Methods</h1> |
| |
| <p>Apache Druid (incubating) basically supports three types of batch ingestion: Apache Hadoop-based |
| batch ingestion, native parallel batch ingestion, and native local batch |
| ingestion. The below table shows what features are supported by each |
| ingestion method.</p> |
| |
| <table><thead> |
| <tr> |
| <th></th> |
| <th>Hadoop-based ingestion</th> |
| <th>Native parallel ingestion</th> |
| <th>Native local ingestion</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td>Parallel indexing</td> |
| <td>Always parallel</td> |
| <td>Parallel if firehose is splittable</td> |
| <td>Always sequential</td> |
| </tr> |
| <tr> |
| <td>Supported indexing modes</td> |
| <td>Replacing mode</td> |
| <td>Both appending and replacing modes</td> |
| <td>Both appending and replacing modes</td> |
| </tr> |
| <tr> |
| <td>External dependency</td> |
| <td>Hadoop (it internally submits Hadoop jobs)</td> |
| <td>No dependency</td> |
| <td>No dependency</td> |
| </tr> |
| <tr> |
| <td>Supported <a href="http://druid.io/docs/latest/ingestion/index.html#roll-up-modes">rollup modes</a></td> |
| <td>Perfect rollup</td> |
| <td>Best-effort rollup</td> |
| <td>Both perfect and best-effort rollup</td> |
| </tr> |
| <tr> |
| <td>Supported partitioning methods</td> |
| <td><a href="http://druid.io/docs/latest/ingestion/hadoop.html#partitioning-specification">Both Hash-based and range partitioning</a></td> |
| <td>N/A</td> |
| <td>Hash-based partitioning (when <code>forceGuaranteedRollup</code> = true)</td> |
| </tr> |
| <tr> |
| <td>Supported input locations</td> |
| <td>All locations accessible via HDFS client or Druid dataSource</td> |
| <td>All implemented <a href="./firehose.html">firehoses</a></td> |
| <td>All implemented <a href="./firehose.html">firehoses</a></td> |
| </tr> |
| <tr> |
| <td>Supported file formats</td> |
| <td>All implemented Hadoop InputFormats</td> |
| <td>Currently text file formats (CSV, TSV, JSON) by default. Additional formats can be added though a <a href="../development/modules.html">custom extension</a> implementing <a href="https://github.com/apache/incubator-druid/blob/master/core/src/main/java/org/apache/druid/data/input/FiniteFirehoseFactory.java"><code>FiniteFirehoseFactory</code></a></td> |
| <td>Currently text file formats (CSV, TSV, JSON) by default. Additional formats can be added though a <a href="../development/modules.html">custom extension</a> implementing <a href="https://github.com/apache/incubator-druid/blob/master/core/src/main/java/org/apache/druid/data/input/FiniteFirehoseFactory.java"><code>FiniteFirehoseFactory</code></a></td> |
| </tr> |
| <tr> |
| <td>Saving parse exceptions in ingestion report</td> |
| <td>Currently not supported</td> |
| <td>Currently not supported</td> |
| <td>Supported</td> |
| </tr> |
| <tr> |
| <td>Custom segment version</td> |
| <td>Supported, but this is NOT recommended</td> |
| <td>N/A</td> |
| <td>N/A</td> |
| </tr> |
| </tbody></table> |
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