Timo Walther created FLINK-9113:
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Summary: Data loss in BucketingSink when writing to local
filesystem
Key: FLINK-9113
URL: https://issues.apache.org/jira/browse/FLINK-9113
Project: Flink
Issue Type: Bug
Components: Streaming Connectors
Reporter: Timo Walther
Assignee: Timo Walther
This issue is closely related to FLINK-7737. By default the bucketing sink uses
HDFS's {{org.apache.hadoop.fs.FSDataOutputStream#hflush}} for performance
reasons. However, this leads to data loss in case of TaskManager failures when
writing to a local filesystem {{org.apache.hadoop.fs.LocalFileSystem}}. We
should use {{hsync}} by default in local filesystem cases and make it possible
to disable this behavior if needed.
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