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https://issues.apache.org/jira/browse/HDFS-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-3510:
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Status: Patch Available (was: Open)
> Some FSEditLog pre-allocation problems in branch-1
> --------------------------------------------------
>
> Key: HDFS-3510
> URL: https://issues.apache.org/jira/browse/HDFS-3510
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Fix For: 1.0.0
>
> Attachments: HDFS-3510-b1.001.patch
>
>
> In the FSEditLog, we want to avoid running out of space in the middle of
> writing an edit log operation to the disk. We do this by a process called
> "preallocation"-- reserving space on the disk for the upcoming edit log
> entries before beginning to write them.
> branch-1 has some major problems with the way it does preallocation. These
> problems can lead to corrupt edit logs when the disk runs out of space during
> an edit log sync operation.
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