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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15571) After HADOOP-13440, multiple filesystems/file-contexts created with the same Configuration object are forced to have the same umask
Date Fri, 29 Jun 2018 01:55:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated HADOOP-15571:
---------------------------------------------
    Attachment: HADOOP-15571.txt

> After HADOOP-13440, multiple filesystems/file-contexts created with the same Configuration
object are forced to have the same umask
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-15571
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15571
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Priority: Critical
>         Attachments: HADOOP-15571.txt
>
>
> Ran into a super hard-to-debug due to this.
> h4. Issue
> Configuration conf = new Configuration();
>  fc1 = FileContext.getFileContext(uri1, conf);
>  fc2 = FileContext.getFileContext(uri2, conf);
>  fc.setUMask(umask_for_fc1); // Screws up umask for fc2 also!
> This was not the case before HADOOP-13440.
> h4. Symptoms:
> h5. Scenario I ran into
> When trying to localize a HDFS directory (hdfs:///my/dir/1.txt), NodeManager tries to
replicate the directory structure on the local file-system ($yarn-local-dirs/filecache/my/dir/1.txt).
> Now depending on whether NM has ever done a log-aggregation (completely unrelated code
that sets umask to be 137 for its own files on HDFS), the directories /my and /my/dir on local-fs
may have different permissions. In the specific case where NM did log-aggregation, /my/dir
was created with 137 umask and so localization of 1.txt completely failed due to absent directory
executable permissions!
> h5. Previous scenarios:
> We ran into this before in test-cases and instead of fixing the root-cause, we just fixed
the test-cases: YARN-5679 / YARN-5749



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