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From Yakov Zhdanov <yzhda...@apache.org>
Subject Re: Neighbors exclusion
Date Mon, 16 Jul 2018 18:24:54 GMT
Dmitry, it hink we can do this change right away. All we need is to add
proper error message on cache config validation in order to tell user that
default changed and manual configuration is needed for compatibility.

--Yakov

2018-07-16 15:47 GMT+03:00 Dmitry Karachentsev <dkarachentsev@gridgain.com>:

> Created a ticket and mapped to 3.0 version, as it changes basic default
> behavior:
> https://issues.apache.org/jira/browse/IGNITE-9011
>
> Thanks!
>
> 13.07.2018 22:10, Valentin Kulichenko пишет:
>
> Dmitry,
>>
>> Good point. I think it makes sense to even remove (deprecate) the
>> excludeNeighbors property and always distribute primary and backups to
>> different physical hosts in this scenario. Because why would anyone ever
>> set this to false if we switch default to true? This also automatically
>> fixes the confusing behavior of backupFilter - it should never be ignored
>> if it's set.
>>
>> -Val
>>
>> On Fri, Jul 13, 2018 at 8:05 AM Dmitry Karachentsev <
>> dkarachentsev@gridgain.com> wrote:
>>
>> Hi folks,
>>>
>>> Why RendezvousAffinityFunction.excludeNeighbors [1] is false by default?
>>> It's not obvious that if user wants to run more than one node per
>>> machine it has also set this flag to true explicitly. Maybe it would be
>>> better to set it to true by default?
>>>
>>> At the same time if excludeNeighbors is true, it ignores backupFilter.
>>> Why it's not vice-versa? For example:
>>>
>>> 1) if backupFilter is set - it will be used,
>>>
>>> 2) if there are not enough backup nodes (or no backupFilter) - try to
>>> distribute according to excludeNeighbors = true,
>>>
>>> 3) if this is not possible too (or excludeNeighbors) = false - assign
>>> partitions as possible.
>>>
>>> [1]
>>>
>>> https://ignite.apache.org/releases/latest/javadoc/org/apache
>>> /ignite/cache/affinity/rendezvous/RendezvousAffinityFunction
>>> .html#setExcludeNeighbors-boolean-
>>>
>>> Are there any drawbacks in such approach?
>>>
>>> Thanks!
>>>
>>>
>>>
>

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