[
https://issues.apache.org/jira/browse/HDFS-6239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968042#comment-13968042
]
xyzzy commented on HDFS-6239:
-----------------------------
I found a simple repro for quoting behavior:
xx@xx:~$ cat x
exec "./y" "/u/s" \; "ls /u/s"
xx@xx:~$ cat y
echo "y" $@
xx@xx:~$ bash -x x
+ exec ./y /u/s ';' 'ls /u/s'
y /u/s ; ls /u/s
You can see the ; gets quoted.
> 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
> AFS file system.
> 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. Can't figure out a way to
> handle this seemingly trivial bug.
> hadoop-daemons.sh calls slave.sh:
> exec "$bin/slaves.sh" --config $HADOOP_CONF_DIR cd "$HADOOP_HOME" \;
> "$bin/hadoop-daemon.sh" --config $HADOOP_CONF_DIR "$@"
> This is the issue when I debug using bash -x: In slaves.sh, the \; becomes ';'
> + ssh xxxx.xx.xxxx.xxx cd /afs/xx.xxxx.xxx/x/x/x/xx/xxxxx/libexec/.. ';'
> /afs/xx.xxxx.xxx/x/x/x/xx/xxxx/bin/hadoop-daemon.sh --config
> /afs/xx.xxxx.xxx/x/x/x/xx/xxxx/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.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
