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Created March 4, 2021 13:12
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Splitting a shard in Solr
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split_shard.md

Splitting a shard in Solr

  1. Split the old shard [1] This will split the shard in two on the existing node. Note you need enough disk space.

     https://solr1/admin/collections?action=SPLITSHARD&collection=name&shard=shardID&async=9999

  2. Poll for completion [2]

     https://solr1/admin/collections?action=REQUESTSTATUS&requestid=9999

  3. Move one of the replicas to the other host (solr2) [3]

     https://solr1/admin/collections?action=MOVEREPLICA&collection=name&shard=shardID&replica=replicaID&sourceNode=solr1:8983_solr&targetNode=solr2:8983_solr&async=8888

  4. Poll for completion [2]

     https://solr1/admin/collections?action=REQUESTSTATUS&requestid=8888

  5. Remove old, inactive replica [4]

     https://solr1/admin/collections?action=DELETEREPLICA&collection=name&shard=shardID&replica=replicaID

[1] https://solr.apache.org/guide/8_4/shard-management.html#splitshard
[2] https://solr.apache.org/guide/8_4/collections-api.html#requeststatus
[3] https://solr.apache.org/guide/8_4/replica-management.html#movereplica
[4] https://solr.apache.org/guide/8_4/replica-management.html#deletereplica

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