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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5823) Store Checkpoint Root Metadata in StateBackend (not in HA custom store)
Date Wed, 10 Jan 2018 18:22:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320769#comment-16320769
] 

ASF GitHub Bot commented on FLINK-5823:
---------------------------------------

Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5248#discussion_r160758717
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/StateBackend.java
---
    @@ -84,13 +84,44 @@
     public interface StateBackend extends java.io.Serializable {
     
     	// ------------------------------------------------------------------------
    -	//  Persistent Bytes Storage
    +	//  Checkpoint storage - the durable persistence of checkpoint data
    --- End diff --
    
    Agreed. In the end we have:
      - `CheckpointStorage`: Persisting bytes and Metadata. The Stream factories should go
there in the next part of the rework.
      - `KeyedStateBackend`: Holding / snapshotting keyed state
      - `OperatorStateBackend`: Holding / snapshotting operator state
    
    These should be three completely independent interfaces, and this PR moves towards that
by introducing the `CheckpointStorage`, even though it does not yet move the Stream Factories
there.
    
    Once the rework is done, the `StateBackend` just bundles a combination is the three above
components (should have only three methods, maybe convenience overload).


> Store Checkpoint Root Metadata in StateBackend (not in HA custom store)
> -----------------------------------------------------------------------
>
>                 Key: FLINK-5823
>                 URL: https://issues.apache.org/jira/browse/FLINK-5823
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Blocker
>             Fix For: 1.5.0
>
>




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