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Posted to issues@flink.apache.org by "Timo Walther (JIRA)" <ji...@apache.org> on 2018/03/29 16:14:00 UTC

[jira] [Created] (FLINK-9113) Data loss in BucketingSink when writing to local filesystem

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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