[infinispan-issues] [JBoss JIRA] (ISPN-5965) Add a new mode (READ ONLY) for Partition Handling

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-5965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159400#comment-13159400 ] 

Dan Berindei commented on ISPN-5965:
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My feeling is that the cluster would spend too much time in read-only mode, as it would have to enter after any node crashes. But I guess the option could be useful if the cache is mostly static and the application can tolerate stale data (as the cache could stay in read-only mode for a very long time).

> Add a new mode (READ ONLY) for Partition Handling
> -------------------------------------------------
>
>                 Key: ISPN-5965
>                 URL: https://issues.jboss.org/browse/ISPN-5965
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Core
>            Reporter: Wolf-Dieter Fink
>              Labels: partition_handling
>
> Without any PartitionHandling it is not possible to ensure the consistency of the cache.
> With PH enabled it depends whether the remaining partition has the majority or at least all owners for a particular key to be able to access the key.
> In some cases the prefered behaviour is to keep every entry readable but prevent from any change to keep consistency.
> So there should be a configuration option for the partition handling to switch all instances to READ_ONLY instead of AVAILABLE/DEGRADED.
> In this case each get will return the current value but each put will be rejected with a AvailabilityException
> This prevents from any rebalancing if one partition contains a majority and stay available.
> But in  case of a real instance crash it might need a human interaction to set the state back to AVAILABLE as the node will never come back to the cluster.



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