Thanks for the clarification, Ben, that makes sense.

Kinda related to the topic, I’m seeing that pretty much all failed lease 
updates happens because of ‘ResourceBusy’, I couldn’t find which resource it 
could be.

Is there any additional log I can enable that could give me a better 
understanding of what is blocking the updates?

I’m on version 2.6.2, hosts were provisioned generously, and load is minimal.

here are some relevant bits from my config:


"multi-threading": {
    "enable-multi-threading": true,
    "thread-pool-size": 4,
    "packet-queue-size": 28
}

"high-availability": [
    {
        "this-server-name": "dc1.kea01",
        "trust-anchor": "root.pem",
        "cert-file": "kea.pem",
        "key-file": "kea.pem",
        "cert-required": true,
        "mode": "load-balancing",
        "heartbeat-delay": 2000,
        "max-response-delay": 4000,
        "max-ack-delay": 1000,
        "max-unacked-clients": 5,
        "delayed-updates-limit": 100,
        "max-rejected-lease-updates": 30,
        "peers": [
            {
                "name": "dc1.kea01",
                "url": http://[2001:0DB8:1::1]:8004/,
                "role": "primary",
                "auto-failover": true
            },
            {
                "name": "dc2.kea01",
                "url": http://[2001:0DB8:2::1]:8004/,
                "role": "secondary",
                "auto-failover": true
            },
            {
                "name": "dc1.kea02",
                "url": "[2001:0DB8:1::2]:8004/",
                "role": "backup"
            }
        ],
        "multi-threading": {
            "enable-multi-threading": true,
            "http-dedicated-listener": true,
            "http-listener-threads": 0,
            "http-client-threads": 0
        }
    }
]

Thanks,
– Diogo

From: Kea-users <kea-users-boun...@lists.isc.org> on behalf of Ben Scott 
<bsc...@isc.org>
Date: Wednesday, May 28, 2025 at 10:15 AM
To: Kea user's list <kea-users@lists.isc.org>
Subject: Re: [Kea-users] Is max-rejected-lease-updates a commutative or rate 
limit?
"Diogo André de Assumpção" <d...@meta.com> wrote:
> in the HA config, is the ` max-rejected-lease-updates` value cumulative (i.e..
> 10 over the lifetime of the process) or based on a rate limit (i.e.. 10 in the
> last 60 seconds)?

  To my understanding: Neither.  The counter resets with the first accepted 
lease update.  After X rejected updates, Kea enters the HA_TERMINATED stated.  
If things start working again before then, all is forgiven.

  -- Ben

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