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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 16:41:13 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320601#comment-16320601
] 

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

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

    https://github.com/apache/flink/pull/5248#discussion_r160727075
  
    --- 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
    +	// ------------------------------------------------------------------------
    +
    +	/**
    +	 * Resolves the given pointer to a checkpoint/savepoint into a state handle from which
the
    +	 * checkpoint metadata can be read. If the state backend cannot understand the format
of
    +	 * the pointer (for example because it was created by a different state backend) this
method
    +	 * should throw an {@code IOException}.
    +	 *
    +	 * @param pointer The pointer to resolve.
    +	 * @return The state handler from which one can read the checkpoint metadata.
    +	 *
    +	 * @throws IOException Thrown, if the state backend does not understand the pointer,
or if
    +	 *                     the pointer could not be resolved due to an I/O error.
    +	 */
    +	StreamStateHandle resolveCheckpoint(String pointer) throws IOException;
    --- End diff --
    
    Similar to the `String` vs `StoragePointer`, this could also be a class that, essentially
, is a `StreamStateHandle` but gives a name to the concept, e.g. `CheckpointMetaDataHandle`.
But it is not as bad as the other case, because this is never passed down very deep (yet).


> 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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