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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4434) Improve log rotation and reduce communication between agent and logging process, make agent more fault tolerant
Date Wed, 05 Nov 2008 06:03:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Yang updated HADOOP-4434:
------------------------------

    Attachment: HADOOP-4434.patch

- Added returning of adaptor id when processing a command.
- Added test case to make sure adaptor can be started correctly.
- Added test case for Start streaming data in the middle of the file.
- Changed adaptor interface to remember stream name.
- Added logic to check for existing data stream and prevent the same data stream being added
twice.
- Increased maximum post size to 2MB.

> Improve log rotation and reduce communication between agent and logging process, make
agent more fault tolerant
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4434
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4434
>             Project: Hadoop Core
>          Issue Type: Improvement
>         Environment: Redhat Enterprise Linux 4.5, Java 6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: HADOOP-4434.patch
>
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> - Chukwa Agent does not handle rotated log correctly.  The current design requires the
logging process to pause the agent, rotate the log, then resume the log streaming.  The three
communication between the running process and chukwa agent could become a problem when either
or one of the process is down.  The implementation should be able to detect log rotation in
the chukwa agent.
> - Chukwa Agent should detect and prevent the same log being streamed more than once.
> - Chukwa Agent should synchronize data streaming addition when picking up the check point
file.

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