[Freeipa-users] changing the default for changelog trimmimg

[thierry bordaz]

On 07/03/2015 02:03 PM, Petr Spacek wrote:
> On 3.7.2015 11:45, thierry bordaz wrote:
>> On 06/30/2015 03:54 PM, Ludwig Krispenz wrote:
>>> Hi,
>>>
>>> 389-ds allows to configure the max size of the replication changelog either
>>> by setting a maximum record number or a maximum age of changes.
>>> freeIPA does not use this setting. In the context of ticket
>>> https://fedorahosted.org/freeipa/ticket/5086 we are discussing to change the
>>> default to
>>> enable changelog trimming.
>>>
>>> Does anyone already use changlog trimming or is there a  scenario where you
>>> rely on all changes being available ?
>>>
>>> Thanks for your feedback,
>>> Ludwig
>>>
>> Hello,
>>
>>     I think it is reasonable to set nsds5ReplicaPurgeDelay and
>>     nsslapd-changelogmaxage to similar value.
>>
>>     When a replica (master or consumer) is down for some time and is
>>     restarted, both attribute express the ability to get the replica in
>>     sync with the rest of the topology.
>>     It can work (and likely will) if
>>     nsds5ReplicaPurgeDelay<nsslapd-changelogmaxage but there are always
>>     corner cases that can lead to problem (like entries that diverge).
>>
>>     Currently purgedelay=7days (default) and changelogmaxage is infinite
>>     and changing purgedelay=infinite impacts the size of the entries.
> I wonder if these values could/should be controlled by topology plugin. Does
> it make sense to have different values on different replicas?
>
Purgedelay can be different on each replica but it makes sense that the 
value is the same on all replicas. It is used to remove too old csn and 
so how far in the past the replication can decide which value is more 
recent than an other one. With different values of purge delay, a 
replica can decide to keep one value and an other replica can decide the 
opposite.
Currently purgedelay is identical on all replicas (default value).

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