50 lines
1.8 KiB
Plaintext
50 lines
1.8 KiB
Plaintext
[[modules-transport]]
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== Transport
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The transport module is used for internal communication between nodes
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within the cluster. Each call that goes from one node to the other uses
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the transport module (for example, when an HTTP GET request is processed
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by one node, and should actually be processed by another node that holds
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the data).
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The transport mechanism is completely asynchronous in nature, meaning
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that there is no blocking thread waiting for a response. The benefit of
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using asynchronous communication is first solving the
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http://en.wikipedia.org/wiki/C10k_problem[C10k problem], as well as
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being the idle solution for scatter (broadcast) / gather operations such
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as search in Elasticsearch.
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[float]
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=== TCP Transport
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The TCP transport is an implementation of the transport module using
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TCP. It allows for the following settings:
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[cols="<,<",options="header",]
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|=======================================================================
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|Setting |Description
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|`transport.tcp.port` |A bind port range. Defaults to `9300-9400`.
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|`transport.publish_port` |The port that other nodes in the cluster
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should use when communicating with this node. Useful when a cluster node
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is behind a proxy or firewall and the `transport.tcp.port` is not directly
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addressable from the outside. Defaults to the actual port assigned via
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`transport.tcp.port`.
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|`transport.tcp.connect_timeout` |The socket connect timeout setting (in
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time setting format). Defaults to `2s`.
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|`transport.tcp.compress` |Set to `true` to enable compression (LZF)
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between all nodes. Defaults to `false`.
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|=======================================================================
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It also shares the uses the common
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<<modules-network,network settings>>.
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[float]
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=== Local Transport
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This is a handy transport to use when running integration tests within
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the JVM. It is automatically enabled when using
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`NodeBuilder#local(true)`.
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