Re: Solr & Kubernetes - how to configure the liveness

[戴晓彬 <xi...@foxmail.com>]

Thanks, Jan, this is helpful to me.
I thought about it for a long time, but I finally figured it out.

> 2021年11月2日 00:03，Jan Høydahl <ja...@cominvent.com> 写道：
> 
> If recovery failed, then that core is dead, it has given up.
> So if an agent has just restarted or started a node, then it will wait until all cores have a "stable" or "final" state, before it declares the NODE as healthy, and consider restarting other nodes.
> If a core (replica of a shard in a collection) is in DOWN state, it has just booted and will soon go into RECOVERING. It will stay in RECOVERING until it either is OK or RECOVERY_FAILED.
> There is no point in waiting in an endless loop for every single core on a node to come up, we just want them to finish initializing and enter a stable state.
> I guess other logic in solr-operator will take care of deciding how many replicas for a shard are live, as to whether it is safe to take down the next pod/node.
> 
> Jan
> 
>> 31. okt. 2021 kl. 16:14 skrev 戴晓彬 <xi...@foxmail.com>:
>> 
>> I'm a little puzzled, why UNHEALTHY_STATES does not contain State.RECOVERY_FAILED
>> 
>>> 2021年10月31日 22:45，Jan Høydahl <ja...@cominvent.com> 写道：
>>> 
>>> See https://solr.apache.org/guide/8_10/implicit-requesthandlers.html#admin-handlers, you can query each node with 
>>> 
>>> http://node:8983/api/node/health?requireHealthyCores=true
>>> 
>>> It will only return HTTP 200 if all active cores on the node are healthy (none starting or recovering).
>>> 
>>> Jan
>>> 
>>>> 27. okt. 2021 kl. 17:27 skrev Vincenzo D'Amore <v....@gmail.com>:
>>>> 
>>>> Hi all,
>>>> 
>>>> when a Solr instance is started I would be sure all the indexes present are
>>>> up and running, in other words that the instance is healthy.
>>>> The healthy status (aka liveness/readiness) is especially useful when a
>>>> Kubernetes SolrCloud cluster has to be restarted for any configuration
>>>> management needs and you want to apply your change one node at a time.
>>>> AFAIK I can ping only one index at a time, but there is no way out of the
>>>> box to test that a bunch of indexes are active (green status).
>>>> Have you ever faced the same problem? What do you think?
>>>> 
>>>> Best regards,
>>>> Vincenzo
>>>> 
>>>> -- 
>>>> Vincenzo D'Amore
>>> 
>> 
>