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adding _replicas_only preference for Shadow Replica indices #12222

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kozaczynski opened this issue Jul 14, 2015 · 0 comments
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adding _replicas_only preference for Shadow Replica indices #12222

kozaczynski opened this issue Jul 14, 2015 · 0 comments
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discuss :Search/Search Search-related issues that do not fall into other categories

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@kozaczynski
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For Shadow Replica indices stored in shared storage we want to delegate queries to the shadow replica nodes only. This is to maximize the ingestion rates by preventing primary shard nodes from both indexing and running queries. The preference settings (see: https://www.elastic.co/guide/en/elasticsearch/reference/1.6/search-request-preference.html ) do not include an option to delegate queries to replicas only.

This is a request to add _replicas_only preference to the current set of preferences (or _shadow_replicas_only, if we limit the feature to Shadow Replica indices).
@clintongormley clintongormley added discuss :Search/Search Search-related issues that do not fall into other categories labels Jul 14, 2015
@dakrone dakrone mentioned this issue Jul 14, 2015
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dakrone added a commit to dakrone/elasticsearch that referenced this issue Jul 16, 2015
@dakrone
Add _replica and _replica_first as search preference.
a8391fc 
Just like specifying `?preference=_primary`, this adds the ability to
specify `?preference=_replica` or `?preference=_replica_first` on
requests that support it.

Resolves elastic#12222
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