[jira] Reopened: (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:all-tabpanel ]

Ari Rabkin reopened CHUKWA-421:
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There's a subtle bug in how the new adaptor writes checkpoints. The last-mod date in the checkpoint reflects data SENT, not data WRITTEN. So after a collector crash, this adaptor will resume at the wrong place.  Fix is for the adaptor to keep a mapping from send offset to last-mod-date, listen to commit reports, and write accordingly.

If other adaptors start needing to do this, we might need to pull this functionality out into a utility class.

> 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
>            Assignee: Ari Rabkin
>         Attachments: CHUKWA-421.patch
>
>
> 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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