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https://issues.apache.org/jira/browse/FLINK-4340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413596#comment-15413596
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ASF GitHub Bot commented on FLINK-4340:
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Github user wenlong88 commented on the issue:
https://github.com/apache/flink/pull/2345
@aljoscha we use rocksdb checkpoint machanism to do the semi-async
checkpoint, which use hard link to make checkpoint, cost quite a little IO and
time in synchronized phrase. This works well even when the state is large. and
using the checkpoint dir to restore is also very fast, since no extra IO need,
if the task manager didn't changed.
> Remove RocksDB Semi-Async Checkpoint Mode
> -----------------------------------------
>
> Key: FLINK-4340
> URL: https://issues.apache.org/jira/browse/FLINK-4340
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.1.0
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> This seems to be causing to many problems and is also incompatible with the
> upcoming key-group/sharding changes that will allow rescaling of keyed state.
> Once this is done we can also close FLINK-4228.
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