[jira] [Assigned] (FLINK-9486) Introduce TimerState in keyed state backend

["Stefan Richter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-9486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Richter reassigned FLINK-9486:
-------------------------------------

    Assignee: Stefan Richter

> Introduce TimerState in keyed state backend
> -------------------------------------------
>
>                 Key: FLINK-9486
>                 URL: https://issues.apache.org/jira/browse/FLINK-9486
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>             Fix For: 1.6.0
>
>
> This is the first implementation subtask.
> Goal of this PR is to introduce a timer state that is registered with the keyed state backend, similar to other forms of keyed state.
> For the {{HeapKeyedStateBackend}}, this state lives on the same level as the {{StateTable}} that hold other forms of keyed state, and the implementation is basically backed by {{InternalTimerHeap}}.
> For {{RocksDBKeyedStateBackend}}, in this first step, we also introduce this state, outside of RocksDB and based upon {{InternalTimerHeap}}. This is an intermediate state, and we will later also implement the alternative to store the timers inside a column families in RocksDB. However, by taking this step, we could also still offer the option to have RocksDB state with heap-based timers.



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