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CDN 2.17

Overview

CDN 2.17 implements the following features in addition to previous versions:

  • Origin to Origin stream replication

Origin to Origin stream replication

Since build 5.3.313, streams may be replicated from one Origin to another

cdn_stream_replication_mode=PRIMARY

The feature may be useful to transfer a stream between a regions. For example, a stream published to Origin in Eastern Europe may be replicated to Origin in Western Europe. Then the stream may be viewed by Western Europe subscribers on its Edge servers.

Configuration

By default, any stream replication is disabled

cdn_stream_replication_mode=NONE

Stream may be replicated to a PRIMARY Origin in a different group, for example:

  • Origin 1
    cdn_stream_replication_mode=PRIMARY
cdn_group=EU_EAST
  • Origin 2
    cdn_stream_replication_mode=PRIMARY
cdn_group=EU_WEST

In this case a stream published to Origin 1 will be replicated to Origin 2.

Stream may be replicated to a SECONDARY Origin in the same group, for example:

  • Origin 1
    cdn_stream_replication_mode=PRIMARY
cdn_group=EU_EAST
  • Origin 2
    cdn_stream_replication_mode=PRIMARY
cdn_group=EU_WEST
  • Origin 3
    cdn_stream_replication_mode=SECONDARY
cdn_group=EU_EAST

In this case a stream published to Origin 1 will be replicated to Origin 2 and Origin 3.

REST API

The new REST API query /rest-api/v3/cdn/show_groups is used to display a CDN topology as JSON object, for example

{
    "group_A": {
        "172.28.0.13": {
            "role": "TRANSCODER",
            "version": "2.17",
            "rtt": 53
        },
        "172.28.0.11": {
            "role": "ORIGIN(PRIMARY)",
            "version": "2.17",
            "rtt": 206
        },
        "172.28.0.12": {
            "role": "ORIGIN(SECONDARY)",
            "version": "2.17",
            "rtt": 56
        },
        "172.28.0.1": {
            "role": "EDGE",
            "version": "2.17"
        },
        "172.28.0.15": {
            "role": "EDGE",
            "version": "2.17",
            "rtt": 27
        }
    },
    "group_B": {
        "172.28.0.14": {
            "role": "ORIGIN(PRIMARY)",
            "version": "2.17",
            "rtt": 55
        },
        "172.28.0.17": {
            "role": "EDGE",
            "version": "2.17",
            "rtt": 28
        },
        "172.28.0.16": {
            "role": "ORIGIN(SECONDARY)",
            "version": "2.17",
            "rtt": 216
        }
    }
}

The detailed REST API description is available here

Backward compatibility

  1. Streams will not be replicated to ny Origin of earlier CDN version