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https://issues.apache.org/jira/browse/FLINK-8602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373970#comment-16373970
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Sihua Zhou commented on FLINK-8602:
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[~stefanrichte...@gmail.com] Could you please have a look at this?
> Accelerate recover from failover when use incremental checkpoint
> ----------------------------------------------------------------
>
> Key: FLINK-8602
> URL: https://issues.apache.org/jira/browse/FLINK-8602
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.5.0
> Reporter: Sihua Zhou
> Assignee: Sihua Zhou
> Priority: Major
>
> Currently, when enable incremental checkpoint, if user change the parallelism
> then ```hasExtraKeys``` may be ```true```. If this occur, flink will loop all
> rocksdb instance and iterator all data to fetch the data that fails into
> current ```KeyGroupRange````, this can be improved as follows:
> - 1. For multi rocksdbs, we don't need to iterate the entry of them and
> insert into another one, we can use the `ingestExternalFile()` api to merge
> them.
> - 2. For the keyGroup which is not belong the target keyGroupRange, we can
> delete them lazily by set the `CompactFilter` for the `ColumnFamily`.
> Any advice would be highly appreciated!
>
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