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Date: Wed, 5 Aug 2009 10:45:14 -0700 (PDT)
From: "Eric Yang (JIRA)" <jira@apache.org>
To: chukwa-dev@hadoop.apache.org
Subject: [jira] Commented: (CHUKWA-369) proposed reliability mechanism
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    [ https://issues.apache.org/jira/browse/CHUKWA-369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739641#action_12739641 ] 

Eric Yang commented on CHUKWA-369:
----------------------------------

The list command check may be a scalability problem for the namenode with many collectors/agents.  When there are thousands of Agents issuing size check, this will periodically spike the namenode.  I think you will want to avoid this.

Jerome is more familiar with localWriter, and it seems quota feature is already committed.  Perhaps you could try localWriter instead of SeqFileWriter?


> proposed reliability mechanism
> ------------------------------
>
>                 Key: CHUKWA-369
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-369
>             Project: Hadoop Chukwa
>          Issue Type: New Feature
>          Components: data collection
>    Affects Versions: 0.3.0
>            Reporter: Ari Rabkin
>             Fix For: 0.3.0
>
>
> We like to say that Chukwa is a system for reliable log collection. It isn't, quite, since we don't handle collector crashes.  Here's a proposed reliability mechanism.

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