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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4178) shell scripts should not close stderr
Date Mon, 12 Nov 2012 20:19:12 GMT
Andy Isaacson created HDFS-4178:
-----------------------------------

             Summary: shell scripts should not close stderr
                 Key: HDFS-4178
                 URL: https://issues.apache.org/jira/browse/HDFS-4178
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: scripts
    Affects Versions: 2.0.2-alpha
            Reporter: Andy Isaacson
            Assignee: Andy Isaacson


The {{start-dfs.sh}} and {{stop-dfs.sh}} scripts close stderr for some subprocesses using
the construct
bq. {{2>&-}}
This is dangerous because child processes started up under this scenario will re-use filedescriptor
2 for opened files.  Since libc and many other codepaths assume that filedescriptor 2 can
be written to in error conditions, this can potentially result in data corruption.

Much better to redirect stderr using the construct {{2>/dev/null}}.

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