Patrick Wendell created FLUME-1400:
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Summary: Understand and document behavior of exec source when
tailing rolling logs
Key: FLUME-1400
URL: https://issues.apache.org/jira/browse/FLUME-1400
Project: Flume
Issue Type: Improvement
Reporter: Patrick Wendell
Assignee: Patrick Wendell
There has been some discussion recently around the behavior of exec("tail -f")
when tailing logs, if the log files are themselves being rolled and renamed by
a writer process.
The primary concern is whether there is a race condition or correctness problem
related to tailing a log which is renamed.
I am fairly certain that the tail binary, when passed -f, will deal with all of
the ugliness of recognizing when a file is rolled and open the new "current"
file as expected. However, we should both verify and document that behavior.
Flume OG, which implemented its own tailing functionality, dealt with this
ugliness by introducing increasing break-fix complexity to the tail source. I
am hoping that by delegating to the "tail" binary we have avoided having to do
this (though at the cost of OS portability). Nonetheless, I should confirm this.
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