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Working with Solr collections and shards
Solr is a popular open-source search platform that can handle large volumes of data. Solr allows you to create collections, which are logical groupings of documents that share the same configuration and schema. Collections can be further divided into shards, which are physical partitions of the data that enable horizontal scaling and load balancing.
In this blog post, we will explain how to work with Solr collections and shards using the Solr admin UI and the Solr API. We will also provide some conclusion and FAQs at the end.
To create a collection, you need to specify its name, number of shards, replication factor, configuration name and router name. You can use the Create Collection button in the Collections tab of the Solr admin UI or send a HTTP request to the Solr API endpoint /admin/collections with action=CREATE and other parameters.
To delete a collection, you need to specify its name. You can use the Delete Collection button in the Collections tab of the Solr admin UI or send a HTTP request to the Solr API endpoint /admin/collections with action=DELETE and name parameter.
To split a shard, you need to specify the collection name and the shard name. You can use the Split Shard button in the Shards tab of the Solr admin UI or send a HTTP request to the Solr API endpoint /admin/collections with action=SPLITSHARD and other parameters.
To delete a shard, you need to specify the collection name and the shard name. You can use the Delete Shard button in the Shards tab of the Solr admin UI or send a HTTP request to
the Solr API endpoint /admin/collections with action=DELETESHARD and other parameters.
Conclusion:
Working with Solr collections and shards is easy using the Solr admin UI or the Solr API. Collections allow you to manage your documents logically while shards allow you to distribute your data physically for better performance and scalability.
FAQs:
Q: How do I choose the number of shards for my collection?
A: There is no definitive answer as it depends on your data size,query volume, and hardware resources. A general rule of thumb is to have one shard per 10-20 GB of data.
Q: How do I choose the replication factor for my collection?
A: The replication factor determines how many copies of each shard are stored on different nodes for fault tolerance. A higher replication factor increases availability but also consumes more disk space and network bandwidth. A common choice is to have a replication factor of 2 or 3.
Q: How do I choose the router for my collection?
A: The router determines how documents are assigned to shards based on their unique key values. The default router is the compositeId router, which uses prefixes in
the document IDs to determine
the shard assignment. You can also use custom routers if you have specific requirements for document distribution.
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