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From Evgenii Zhuravlev <e.zhuravlev...@gmail.com>
Subject Re: Rebalancing only to backups
Date Thu, 15 Aug 2019 15:36:50 GMT
Hi Abhishek,

That's how it works now if you have enabled Persistence. Actually, that's
the main reason why BaselineTopology was introduced - we don't want to move
a lot of data between nodes if we know that node will return soon after a
failure: https://apacheignite.readme.io/docs/baseline-topology
If you want to force rebalance, you can manually change the
BaselineTopology.

As far as I know, BaselineTopology concept was also introduced for
in-memory caches and will be released as a part of Apache Ignite 2.8. Also,
there will be some configurable timeout, after which baseline topology will
be changed automatically if you want it.

Best Regards,
Evgenii

чт, 15 авг. 2019 г. в 17:16, Abhishek Gupta (BLOOMBERG/ 731 LEX) <
agupta726@bloomberg.net>:

> (pardon me if this mail is by chance a duplicate - it got bounced back
> when I sent it earlier from nabble)
>
> Hello,
> I have 6 node grid and I've configured it with 1 backup. I want to have
> partition rebalancing but only in the following way.
> If one of the six nodes goes down, then some primary and backup partitions
> go down with it but there is no data loss since the backup for those are
> present on one of the other five nodes. So there is only single copy for
> these paritions
>
> i. At this point I do not want that the 5 nodes rebalance all the paritions
> amongst themselves such that each one has 1 primary and 1 backup
> ii. When this 6th node comes back up, I want the partitions in the other
> nodes which are living with only a single copy, so hydrate this fresh 6th
> one with copies of the partitions that has only one copy before.
>
> Why i? Because I don't want a situation of cascading OOMs
> Why ii? Obvious reason so as to have the 2nd copy for all partitions.
>
> Is this possible? If not what's the best way to come close to this?
>
> Thanks,
> Abhi
>

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