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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6034) Add KeyedStateHandle for the snapshots in keyed streams
Date Thu, 23 Mar 2017 15:44:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15938601#comment-15938601
] 

ASF GitHub Bot commented on FLINK-6034:
---------------------------------------

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

    https://github.com/apache/flink/pull/3531#discussion_r107704681
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/KeyGroupsStateHandle.java
---
    @@ -91,10 +98,10 @@ public KeyGroupsStateHandle getKeyGroupIntersection(KeyGroupRange
keyGroupRange)
     
     	/**
     	 *
    -	 * @return the internal key-group range to offsets metadata
    +	 * @return the start key group in the key-group range of this handle
     	 */
    -	public KeyGroupRangeOffsets getGroupRangeOffsets() {
    -		return groupRangeOffsets;
    +	public int getStartKeyGroup() {
    --- End diff --
    
    I have removed all pass-through methods except `getGroupRangeOffsets()` because `StateInitializationContextImpl$KeyGroupStreamIterator`
is using it to get the iterator for key groups and their offsets.


> Add KeyedStateHandle for the snapshots in keyed streams
> -------------------------------------------------------
>
>                 Key: FLINK-6034
>                 URL: https://issues.apache.org/jira/browse/FLINK-6034
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Xiaogang Shi
>            Assignee: Xiaogang Shi
>
> Currently, the only type of the snapshots in keyed streams is {{KeyGroupsStateHandle}}
which is full and store the states one group after another. With the introduction of incremental
checkpointing, we need a higher level abstraction of keyed snapshots to allow flexible snapshot
formats. 
> The implementation of {{KeyedStateHandle}} s may vary a lot in different backends. The
only information needed in {{KeyedStateHandle}} s is their key group range. When recovering
the job with a different degree of parallelism, {{KeyedStateHandle}} s will be assigned to
those subtasks whose key group ranges overlap with their ranges.



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