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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. -- This message was sent by Atlassian JIRA (v6.3.15#6346)