[jira] [Closed] (FLINK-9487) Prepare InternalTimerHeap for asynchronous snapshots

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

     [ https://issues.apache.org/jira/browse/FLINK-9487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Richter closed FLINK-9487.
---------------------------------
    Resolution: Implemented

Merged in:
master: 7e0eafa74d

> Prepare InternalTimerHeap for asynchronous snapshots
> ----------------------------------------------------
>
>                 Key: FLINK-9487
>                 URL: https://issues.apache.org/jira/browse/FLINK-9487
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing, Streaming
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>             Fix For: 1.6.0
>
>
> When we want to snapshot timers with the keyed backend state, this must happen as part of an asynchronous snapshot.
> The data structure {{InternalTimerHeap}} needs to offer support for this through a lightweight copy mechanism (e.g. arraycopy of the timer queue, because timers are immutable w.r.t. serialization).
> We can also stop keeping the dedup maps in {{InternalTimerHeap}} separated by key-group, all timers can go into one map.
> Instead, we can implement online-partitioning as part of the asynchronous operation, similar to what we do in {{CopyOnWriteStateTable}} snapshots. Notice that in this intermediate state, the code will still run in the synchronous part until we are integrated with the backends for async snapshotting (next subtask of this jira).



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