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Posted to dev@flink.apache.org by "Márton Balassi (JIRA)" <ji...@apache.org> on 2015/02/06 17:37:34 UTC

[jira] [Created] (FLINK-1493) Support for streaming jobs preserving global ordering of records

Márton Balassi created FLINK-1493:
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             Summary: Support for streaming jobs preserving global ordering of records
                 Key: FLINK-1493
                 URL: https://issues.apache.org/jira/browse/FLINK-1493
             Project: Flink
          Issue Type: New Feature
          Components: Streaming
            Reporter: Márton Balassi


Distributed streaming jobs do not give total, global ordering guarantees for records only partial ordering is provided by the system: records travelling on the same exact route of the physical plan are ordered, but they aren't between routes.

It turns out that although this feature can only be implemented via "merge sorting" in the input buffers on a timestamp field thus creating substantial latency is still desired for a number of applications.

Just a heads up for the implementation: the sorting introduces back pressure in the buffers and might cause deadlocks.



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