xyzzy created HDFS-6239:
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Summary: start-dfs.sh does not start remote DataNode due to escape
characters
Key: HDFS-6239
URL: https://issues.apache.org/jira/browse/HDFS-6239
Project: Hadoop HDFS
Issue Type: Bug
Components: scripts
Affects Versions: 1.2.1
Environment: GNU bash, version 4.1.2(1)-release
(x86_64-redhat-linux-gnu)
Linux foo 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Dec 13 06:58:20 EST 2013 x86_64
x86_64 x86_64 GNU/Linux
Reporter: xyzzy
start-dfs.sh fails to start remote data nodes and task nodes, though it is
possible to start them manually through hadoop-daemon.sh.
I've been able to debug and find the root cause the bug, and I thought it was a
trivial fix, but I do not know how to do it.
This is the issue when I debug using bash -x:
hadoop-daemons.sh calls slave.sh:
exec "$bin/slaves.sh" --config $HADOOP_CONF_DIR cd "$HADOOP_HOME" \;
"$bin/hadoop-daemon.sh" --config $HADOOP_CONF_DIR "$@"
In slaves.sh, it becomes:
ssh foo cd /foo/h/libexec/.. ';' /foo/hcain/bin/hadoop-daemon.sh --config
/foo/h/libexec/../conf start datanode
The problem is ';' . Because the semi-colon is surrounded by quotes, it doesn't
execute the code after that. I manually ran the above command, and as expected
the data node did not start. When I removed the quotes around the semi-colon,
everything works. Please note that you can see the issue only when you do bash
-x. If you echo the statement, the quotes around the semi-colon are not visible.
This issue is always reproducible for me, and because of it, I have to manually
start daemons on each machine.
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