Is it possible to unload the Solr core from just one node?

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rakeshgouda1992_96602 asked Feb 12, '20 Erick Ramirez commented Mar 3, '20

Is it possible to unload the Solr core from just one node?

dsetool unload_core with distributed=false command unloads core from all the nodes..is there any way I can unload only from local node or local DC not entire cluster.please let me know if more information required on this.

dse search solr

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Answer 1 · 2020-02-12T07:53:52Z

Erick Ramirez answered Feb 12, '20 Erick Ramirez commented Mar 3, '20

@rakeshgouda1992_96602 Unloading a Solr core from just one node is not a valid operation in DSE Search since it is not possible to disable Solr operations on just one node. Unloading a core will always apply to all nodes in a Search DC so distributed=false does not have any effect. Cheers!

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rakeshgouda1992_96602 commented · Feb 12, 2020 at 08:28 AM

Thanks for the clarification.

Is it possible to unload from a particular DC in a multi DC cluster.

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Erick Ramirez ♦♦ rakeshgouda1992_96602 commented · Feb 12, 2020 at 09:08 AM

EDIT: @rakeshgouda1992_96602 After some internal discussion, I'm revising my previous response and confirm that unloading a core will unload it from ALL Search DCs. It is not possible to unload it from just one particular DC.

As a side note, we will update the documentation to make this distinction clear. Cheers!

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rakeshgouda1992_96602 Erick Ramirez ♦♦ commented · Feb 12, 2020 at 09:35 AM

Correct,it should only unload from a specific DC,but in my case with 2 DC cluster with both search enabled,when I perform unload core on one specific DC it unloads from both the DC.

Is there any other way I can unload only from one DC.

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rakeshgouda1992_96602 commented · Mar 03, 2020 at 09:45 AM

Below are my observations after testing on a 2DC cluster DC1, DC2 having 5 nodes each.

Whene we unload_core on DC1, It deletes all the solr resources, solr directories and indexes from DC1 and it unloads only the core from DC2 , However the solr indexes and directories on DC2 remain as it is.

$ dsetool unload_core keyspace_name.table deleteDataDir=true deleteResources=true distributed=true

Once we create_core with modified schema and solrconfig file on DC1, DC2 will continue to use the previous index.

$ dsetool write_resource keyspace_name.table name=schema.xml file=./schema.xml
$ dsetool write_resource keyspace_name.table name=solrconfig.xml file=./solrconfig.xml
$ dsetool create_core keyspace_name.table reindex=true distributed=true

Once the reindexing is completed in DC1, run a reload_core command in DC2

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Erick Ramirez ♦♦ rakeshgouda1992_96602 commented · Mar 03, 2020 at 07:16 PM

FYI I've converted your post to a comment since it is not an "answer". Cheers!

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