[HDFS-4178] shell scripts should not close stderr

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.2-alpha
• Fix Version/s: 2.0.3-alpha
• Component/s: scripts
• Hadoop Flags: Reviewed
• Assignee: Andy Isaacson
• Reporter: Andy Isaacson
• Created: 12/Nov/12 20:18
• Updated: 03/Sep/14 23:09
• Resolved: 19/Nov/12 15:17

Description

The start-dfs.sh and stop-dfs.sh scripts close stderr for some subprocesses using the construct

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.