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https://issues.apache.org/jira/browse/FLINK-6364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15992662#comment-15992662
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ASF GitHub Bot commented on FLINK-6364:
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Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3801
@gyfora this is already happening in the code: the backend tracks which
files are already transferred to hdfs, and a reference counting in the
checkpoint coordinator (introduced in FLINK-6014) takes care of deleting
SSTable files from the shared HDFS directory that are no longer referenced by
any incremental checkpoint.
> Implement incremental checkpointing in RocksDBStateBackend
> ----------------------------------------------------------
>
> Key: FLINK-6364
> URL: https://issues.apache.org/jira/browse/FLINK-6364
> Project: Flink
> Issue Type: Sub-task
> Components: State Backends, Checkpointing
> Reporter: Xiaogang Shi
> Assignee: Xiaogang Shi
>
> {{RocksDBStateBackend}} is well suited for incremental checkpointing because
> RocksDB is base on LSM trees, which record updates in new sst files and all
> sst files are immutable. By only materializing those new sst files, we can
> significantly improve the performance of checkpointing.
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