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7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Operations</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Misc</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">insert-segment-to-db tool</span><meta itemprop="position" content="3"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>insert-segment-to-db tool</h1></header><p>In older versions of Apache Druid, <code>insert-segment-to-db</code> was a tool that could scan deep storage and |
| insert data from there into Druid metadata storage. It was intended to be used to update the segment table in the |
| metadata storage after manually migrating segments from one place to another, or even to recover lost metadata storage |
| by telling it where the segments are stored.</p><p>In Druid 0.14.x and earlier, Druid wrote segment metadata to two places: the metadata store's <code>druid_segments</code> table, and |
| <code>descriptor.json</code> files in deep storage. This practice was stopped in Druid 0.15.0 as part of |
| <a href="https://github.com/apache/druid/issues/6849" target="_blank" rel="noopener noreferrer">consolidated metadata management</a>, for the following reasons:</p><ol><li>If any segments are manually dropped or re-enabled by cluster operators, this information is not reflected in |
| deep storage. Restoring metadata from deep storage would undo any such drops or re-enables.</li><li>Ingestion methods that allocate segments optimistically (such as native Kafka or Kinesis stream ingestion, or native |
| batch ingestion in 'append' mode) can write segments to deep storage that are not meant to actually be used by the |
| Druid cluster. There is no way, while purely looking at deep storage, to differentiate the segments that made it into |
| the metadata store originally (and therefore <em>should</em> be used) from the segments that did not (and therefore |
| <em>should not</em> be used).</li><li>Nothing in Druid other than the <code>insert-segment-to-db</code> tool read the <code>descriptor.json</code> files.</li></ol><p>After this change, Druid stopped writing <code>descriptor.json</code> files to deep storage, and now only writes segment metadata |
| to the metadata store. This meant the <code>insert-segment-to-db</code> tool is no longer useful, so it was removed in Druid 0.15.0.</p><p>It is highly recommended that you take regular backups of your metadata store, since it is difficult to recover Druid |
| clusters properly without it.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/operations/reset-cluster"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">reset-cluster tool</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/operations/pull-deps"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">pull-deps tool</div></a></nav></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> |
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