Andy Isaacson created HDFS-4178:
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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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