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From "David Phillips (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4377) Race condition creating S3 buffer directory for NativeS3FileSystem
Date Fri, 07 Nov 2008 17:50:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Phillips updated HADOOP-4377:
-----------------------------------

    Release Note: Fix "Cannot create S3 buffer directory" race condition error

> Race condition creating S3 buffer directory for NativeS3FileSystem
> ------------------------------------------------------------------
>
>                 Key: HADOOP-4377
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4377
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 0.18.1
>            Reporter: David Phillips
>            Assignee: David Phillips
>         Attachments: hadoop-s3n-tmpdir.patch, hadoop-s3n-tmpdir.patch
>
>
> The buffer directory is checked for existence, then created if it doesn't exist.  But
the create can fail if the another process creates it in between.  We can fix this by checking
for existence again if the create fails.  I've seen "Cannot create S3 buffer directory" occur,
and this race is the most plausible explanation.

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