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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3510) Improve FSEditLog pre-allocation
Date Mon, 10 Sep 2012 19:54:08 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-3510:
------------------------------

    Attachment: hdfs-3510-branch-2.txt

Here's a patch which applies against branch-2
                
> Improve FSEditLog pre-allocation
> --------------------------------
>
>                 Key: HDFS-3510
>                 URL: https://issues.apache.org/jira/browse/HDFS-3510
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 3.0.0
>
>         Attachments: HDFS-3510.001.patch, HDFS-3510.003.patch, HDFS-3510.004.patch, HDFS-3510.004.patch,
HDFS-3510.006.patch, HDFS-3510.007.patch, HDFS-3510.008.patch, HDFS-3510.009.patch, HDFS-3510.010.patch,
HDFS-3510.011.patch, HDFS-3510-b1.001.patch, HDFS-3510-b1.002.patch, hdfs-3510-branch-2.txt
>
>
> It is good to avoid running out of space in the middle of writing a batch of edits, because
when it happens, we often get partial edits at the end of the log.
> Edit log preallocation can solve this problem (see HADOOP-2330 for a full description
of edit log preallocation).
> The current pre-allocation code was introduced for performance reasons, not for preventing
partial edits.  As a consequence, we sometimes do a write without using pre-allocation.  We
should change the pre-allocation code so that it always preallocates at least enough space
before writing out the edits.

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