Github user manuzhang commented on the issue:
https://github.com/apache/incubator-gearpump/pull/159
For any message to be sent out, its `timestamp` should be within the
`LifeTime` of a Task. The `LifeTime` is of range `[birth, death)` where `death`
is excluding. Currently, the maximum values of both `timestamp` and `death` are
`Long.MaxValue` in milliseconds. Consequently, message with the maximum
timestamp can't be sent out.
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