70 lines
2.0 KiB
Plaintext
70 lines
2.0 KiB
Plaintext
[[modules-memcached]]
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== memcached
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The memcached module allows to expose *Elasticsearch*
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APIs over the memcached protocol (as closely
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as possible).
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It is provided as a plugin called `transport-memcached` and installing
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is explained
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https://github.com/elastic/elasticsearch-transport-memcached[here]
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. Another option is to download the memcached plugin and placing it
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under the `plugins` directory.
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The memcached protocol supports both the binary and the text protocol,
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automatically detecting the correct one to use.
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[float]
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=== Mapping REST to Memcached Protocol
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Memcached commands are mapped to REST and handled by the same generic
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REST layer in Elasticsearch. Here is a list of the memcached commands
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supported:
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[float]
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==== GET
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The memcached `GET` command maps to a REST `GET`. The key used is the
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URI (with parameters). The main downside is the fact that the memcached
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`GET` does not allow body in the request (and `SET` does not allow to
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return a result...). For this reason, most REST APIs (like search) allow
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to accept the "source" as a URI parameter as well.
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[float]
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==== SET
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The memcached `SET` command maps to a REST `POST`. The key used is the
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URI (with parameters), and the body maps to the REST body.
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[float]
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==== DELETE
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The memcached `DELETE` command maps to a REST `DELETE`. The key used is
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the URI (with parameters).
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[float]
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==== QUIT
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The memcached `QUIT` command is supported and disconnects the client.
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[float]
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=== Settings
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The following are the settings the can be configured for memcached:
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[cols="<,<",options="header",]
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|===============================================================
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|Setting |Description
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|`memcached.port` |A bind port range. Defaults to `11211-11311`.
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|===============================================================
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It also uses the common
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<<modules-network,network settings>>.
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[float]
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=== Disable memcached
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The memcached module can be completely disabled and not started using by
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setting `memcached.enabled` to `false`. By default it is enabled once it
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is detected as a plugin.
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