[jira] Commented: (CHUKWA-421) new logfile rotation detection scheme

["Ari Rabkin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CHUKWA-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785503#action_12785503 ] 

Ari Rabkin commented on CHUKWA-421:
-----------------------------------

My idea is as follows:

1) Adaptors should keep track of the last-modified date of the file they're tailing. 
2) Each time through, get the list of files whose names match the file in question, ignoring trailing stuff after a final dot.  
    (Possible rotation results)
3) Process them, oldest-first.    Break ties using longest-first, or some name-based heuristic.


The end goal of this is that if file Foo is being tailed, and then when we look next, Foo is shorter and there's a Foo.1, we'll finish tailing Foo.1, and then start tailing Foo. 



> new logfile rotation detection scheme
> -------------------------------------
>
>                 Key: CHUKWA-421
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-421
>             Project: Hadoop Chukwa
>          Issue Type: Improvement
>          Components: data collection
>            Reporter: Ari Rabkin
>
> Currently, we keep files open in order to detect rotation. This is wasteful of file handles, doesn't work correctly across reboots, and I think we can do better.

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