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Joanna
Joanna
Bronze III
February 16, 2022
Solved

Solr failed to switch to the other one in Ambari

Hi guys,

 

we added solr srever in solrCloud，when I want to achieve to HA in solrCloud. but it is failed in transfer. when one is stop , the other one is living and used by Atlas. 

 

 

Pranjal
PranjalAnswer
Gold ⭐️
February 16, 2022

Hello,

Thank you for reaching out to Cloudera ! 

 

To achieve HA in SolrCloud, there are 2 concepts - 

1. Multiple Live Solr Instances 

2. Replicas for the Collections

 

For example, if you have 2 Solr Instances live in SolrCloud, and you have one collection with multiple shards but with 1 replica. In this case, the Collection is not highly available. In event of issue on one Solr Node, the collection will not be functional .

 

Now, if you have 2 Solr Instances live in SolrCloud, and you have one collection with multiple shards with 2 replicas ( Replicas <= Number of Solr Instances ). In this case, Collection is highly available. In event of issue on one Solr Node, the replicas hosted on other Solr Node will be registered as Active, and will serve client query/updates.

 

To add replicas to an existing collection, ADDREPLICA [1] API can be used. If you have any questions, please do not hesitate to update this discussion.

 

[1] https://solr.apache.org/guide/8_4/replica-management.html#addreplica

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2 replies

Pranjal
Gold ⭐️
PranjalAnswer
Gold ⭐️
February 16, 2022

Hello,

Thank you for reaching out to Cloudera ! 

 

To achieve HA in SolrCloud, there are 2 concepts - 

1. Multiple Live Solr Instances 

2. Replicas for the Collections

 

For example, if you have 2 Solr Instances live in SolrCloud, and you have one collection with multiple shards but with 1 replica. In this case, the Collection is not highly available. In event of issue on one Solr Node, the collection will not be functional .

 

Now, if you have 2 Solr Instances live in SolrCloud, and you have one collection with multiple shards with 2 replicas ( Replicas <= Number of Solr Instances ). In this case, Collection is highly available. In event of issue on one Solr Node, the replicas hosted on other Solr Node will be registered as Active, and will serve client query/updates.

 

To add replicas to an existing collection, ADDREPLICA [1] API can be used. If you have any questions, please do not hesitate to update this discussion.

 

[1] https://solr.apache.org/guide/8_4/replica-management.html#addreplica

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VidyaSargur
Community Manager
VidyaSargur
Community Manager
February 21, 2022

@Joanna, Has the reply helped resolve your issue? If so, please mark the appropriate reply as the solution, as it will make it easier for others to find the answer in the future.

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Regards, Vidya Sargur, Community Manager Was your question answered? Make sure to mark the answer as the accepted solution. If you find a reply useful, say thanks by clicking on the thumbs up button.
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