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From "Jiaqi Tan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CHUKWA-410) Does the BackfillingLoader return only after HDFS blocks are committed?
Date Mon, 07 Dec 2009 01:50:18 GMT

     [ https://issues.apache.org/jira/browse/CHUKWA-410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jiaqi Tan resolved CHUKWA-410.
------------------------------

    Resolution: Not A Problem

Closing this issue since I have not seen it since. The problem seemed to have been due to
a full disk. 

> Does the BackfillingLoader return only after HDFS blocks are committed?
> -----------------------------------------------------------------------
>
>                 Key: CHUKWA-410
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-410
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>          Components: data collection
>    Affects Versions: 0.3.0
>         Environment: Hadoop 0.20.0, Debian 4 (Etch), Chukwa rev 817532
>            Reporter: Jiaqi Tan
>
> I see that the BackfillingLoader is set to AdaptorShutdownPolicy.WAIT_TILL_FINISHED,
what are the semantics of this? Does this mean that the BackfillingLoader returns after the
last HDFS write request is made, but the DFSClient could continue to be flushing blocks to
the DataNodes in the background? Or does that mean that the entire file has been written/flushed
to HDFS and closed and fully available?
> I'm running the Demux immediately after the BackfillingLoader is complete; the raw log
files are complete, but the Demux picks up only half of the entries in those log files. Could
this be because some blocks are not closed yet?

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