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Table of Contents

Introduction

High Availability (HA) of Universal Data Manager Gateway means that it has been set up to be a redundant system; in addition to the components that are processing work, there are back-up components available to continue processing through hardware or software failure.

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Step 1

The Active cluster node sends a heartbeat by updating a timestamp in the database.

The heartbeat interval is 10 seconds. It can be adjusted with the 'Heartbeat' parameter:

[controller]
; The frequency at which the heartbeat will be updated
Heartbeat = 10s

Step 2

All Passive cluster nodes check the Active cluster node's timestamp to determine if it is current.

This check runs every 20 seconds. It can be adjusted with the 'HeartbeatCheck' parameter:



[controller]
; The heartbeat to determine if this instance will be probed
HeartbeatCheck = 20s

Step 3

If a Passive cluster node determines that the Active cluster node's timestamp is stale, failover occurs: the Passive cluster node changes the mode of the Active cluster node to Offline and takes over as the Active cluster node. If more than one cluster node is operating in Passive mode, the first cluster node eligible to become Active that determines that the Active cluster node is not running becomes the Active cluster node. A stale cluster node is one whose timestamp is older than 5 minutes.

It can be adjusted with the 'Deadline' parameter:

[controller]
; The deadline to determine if this instance will be active
Deadline = 5m


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