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https://issues.apache.org/jira/browse/IGNITE-9365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16618388#comment-16618388
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David Harvey commented on IGNITE-9365:
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Hi [~vkulichenko]. The null case is a configuration error, and I'm less
concerned with the behavior, and will defer to you, but here is my thinking.
Either the attribute was misspelled, or one or both nodes did not get the
environment variable/node attribute set. If we return true when the
attribute on all nodes is null, then no backups at all will be created.
Returning false causes the behavior to revert to the behavior without this
class if the attributes are all missing. The some nodes have a null attribute
case is probably even less interesting, and I agree the second null test is
unnecessary, but I erred on the side of symmetry.
> Force backups to different AWS availability zones using only Spring XML
> -----------------------------------------------------------------------
>
> Key: IGNITE-9365
> URL: https://issues.apache.org/jira/browse/IGNITE-9365
> Project: Ignite
> Issue Type: Improvement
> Components: cache
> Environment:
> Reporter: David Harvey
> Assignee: David Harvey
> Priority: Minor
> Fix For: 2.7
>
> Attachments: master_947962f785_availability_zones_via_spring.patch
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> As a developer, I want to be able to force cache backups each to a different
> "Availability Zone", when I'm running out-of-the-box Ignite, without
> additional Jars installed. "Availability zone" is a AWS feature with
> different names for the same function by other cloud providers. A single
> availability zone has the characteristic that some or all of the EC2
> instances in that zone can fail together due to a single fault. You have no
> control over the hosts on which the EC2 instance VMs run on in AWS, except by
> controlling the availability zone .
>
> I could write a few lines of a custom affinityBackupFilter, and configure it
> a RendezvousAffinityFunction, but then I have to get it deployed on all nodes
> in the cluster, and peer class loading will not work to this. The code to
> do this should just be part of Ignite.
>
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