New

The executive guide to generative AI

Read more
About usPartnersSupport|Login

WARNING: Version 1.4 of Elasticsearch has passed its EOL date.

This documentation is no longer being maintained and may be removed. If you are running this version, we strongly advise you to upgrade. For the latest information, see the current release documentation.

« Thrift Snapshot And Restore »
Elastic Docs ›Elasticsearch Guide [1.4] ›Modules

Transport

edit

Transport

edit

The transport module is used for internal communication between nodes within the cluster. Each call that goes from one node to the other uses the transport module (for example, when an HTTP GET request is processed by one node, and should actually be processed by another node that holds the data).

The transport mechanism is completely asynchronous in nature, meaning that there is no blocking thread waiting for a response. The benefit of using asynchronous communication is first solving the C10k problem, as well as being the ideal solution for scatter (broadcast) / gather operations such as search in ElasticSearch.

TCP Transport

edit

The TCP transport is an implementation of the transport module using TCP. It allows for the following settings:

Setting Description

transport.tcp.port

A bind port range. Defaults to 9300-9400.

transport.publish_port

The port that other nodes in the cluster should use when communicating with this node. Useful when a cluster node is behind a proxy or firewall and the transport.tcp.port is not directly addressable from the outside. Defaults to the actual port assigned via transport.tcp.port.

transport.bind_host

The host address to bind the transport service to. Defaults to transport.host (if set) or network.bind_host.

transport.publish_host

The host address to publish for nodes in the cluster to connect to. Defaults to transport.host (if set) or network.publish_host.

transport.host

Used to set the transport.bind_host and the transport.publish_host Defaults to transport.host or network.host.

transport.tcp.connect_timeout

The socket connect timeout setting (in time setting format). Defaults to 30s.

transport.tcp.compress

Set to true to enable compression (LZF) between all nodes. Defaults to false.

It also uses the common network settings.

TCP Transport Profiles

edit

Elasticsearch allows you to bind to multiple ports on different interfaces by the use of transport profiles. See this example configuration

transport.profiles.default.port: 9300-9400
transport.profiles.default.bind_host: 10.0.0.1
transport.profiles.client.port: 9500-9600
transport.profiles.client.bind_host: 192.168.0.1
transport.profiles.dmz.port: 9700-9800
transport.profiles.dmz.bind_host: 172.16.1.2

The default profile is a special. It is used as fallback for any other profiles, if those do not have a specific configuration setting set. Note that the default profile is how other nodes in the cluster will connect to this node usually. In the future this feature will allow to enable node-to-node communication via multiple interfaces.

The following parameters can be configured like that

  • port: The port to bind to
  • bind_host: The host to bind
  • publish_host: The host which is published in informational APIs
  • tcp_no_delay: Configures the TCP_NO_DELAY option for this socket
  • tcp_keep_alive: Configures the SO_KEEPALIVE option for this socket
  • reuse_address: Configures the SO_REUSEADDR option for this socket
  • tcp_send_buffer_size: Configures the send buffer size of the socket
  • tcp_receive_buffer_size: Configures the receive buffer size of the socket

Local Transport

edit

This is a handy transport to use when running integration tests within the JVM. It is automatically enabled when using NodeBuilder#local(true).

« Thrift Snapshot And Restore »

On this page

Was this helpful?
Feedback