When using BucketingSink, it happens that one of the files is always in the [.in-progress] state

[Ben Yan]

Hi,

I am using BucketingSink to write partitioned files to s3 in DataStream API. But now, a problem is found: every now and then, there will be a file that is always in a state of in-progree.When the checkpoint is over, the file is still in that state.As shown below：

Do you have any solutions?

See also：https://issues.apache.org/jira/browse/FLINK-8794  

Best,

Ben