[jira] [Updated] (IGNITE-2389) Need to add ability to swap the queue if it's too long

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-2389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-2389:
------------------------------------
    Fix Version/s:     (was: 2.0)
                   2.1

> Need to add ability to swap the queue if it's too long
> ------------------------------------------------------
>
>                 Key: IGNITE-2389
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2389
>             Project: Ignite
>          Issue Type: Improvement
>          Components: data structures
>            Reporter: Valentin Kulichenko
>             Fix For: 2.1
>
>
> In some cases there can be a requirement to start swapping new queue elements to avoid out of memory errors. For example, if the consumer temporarily stopped for some reason, but the producer still adds elements.
> We can do this based on cache swap space and evictions. I think we should:
> # Add max allowed in-memory elements property to {{CollectionConfiguration}}. We can also support limit by memory size.
> # Implement special eviction policy that will evict new queue elements if limits are reached.
> # Automatically unswap latest elements when consumer resumes polling (can be achieved by a background process).
> In case of {{IgniteSet}}, limits should be also honored, but here we don't have ordering. So I think we can use our standard LRU, but make sure that only elements are swapped. Header and other meta objects should be always in memory.



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