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https://issues.apache.org/jira/browse/FLINK-6034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15923996#comment-15923996
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ASF GitHub Bot commented on FLINK-6034:
---------------------------------------
GitHub user shixiaogang opened a pull request:
https://github.com/apache/flink/pull/3531
[FLINK-6034][checkpoint] Add KeyedStateHandle for the snapshots in keyed
streams
## Changes
- Add `KeyedStateHandle` for the snapshots in keyed streams.
`KeyGroupsStateHandle` now is one of its implementation.
- Distribute `KeyedStateHandle`s to subtasks with their key group range. A
`KeyedStateHandle` will be assigned to all subtasks whose key group range
overlap with its range.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shixiaogang/flink flink-6034
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3531.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3531
----
commit 9637dcc40d66a2702f5227b7bbe3ae66fca89adf
Author: xiaogang.sxg <xiaogang....@alibaba-inc.com>
Date: 2017-03-14T11:04:37Z
Add KeyedStateHandle for the snapshots in keyed streams
----
> 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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