Andrew Onischuk created AMBARI-15762:
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Summary: Component install post processing can not be run in
parallel
Key: AMBARI-15762
URL: https://issues.apache.org/jira/browse/AMBARI-15762
Project: Ambari
Issue Type: Bug
Reporter: Andrew Onischuk
Assignee: Andrew Onischuk
Fix For: 2.2.2
Attachments: AMBARI-15762.patch
**Problem**
Ambari executes component installs in parallel on a host. Each install process
in the post-install phase executes certain shared/common configuration
directory related steps (stacks/HDP/2.0.6/hooks/after-
INSTALL/scripts/shared_initialization.py:link_configs() -> ... -> /resource_ma
nagement/libraries/functions/conf_select.py:convert_conf_directories_to_symlin
ks() ) on the directories listed in conf_select.py:PACKAGE_DIRS
The common configuration directory related processing fail in they are kicked
of in the same time for the same directory.
In the case the following code snippet is executed in the same time by
multiple component installs
each will see the `backup_dir` as non existent and will try to execute the
"cp" command. One will succeed while the others fail.
Execute(("cp", "-R", "-p", old_conf, backup_dir), not_if = format("test -e
{backup_dir}"), sudo = True)
Similar behaviour is seen for the following code snippet:
Execute(as_sudo(["cp", "-R", "-p", os.path.join(old_conf, "*"),
versioned_conf], auto_escape=False), only_if = format("ls -d {old_conf}/*"))
**Possible solution**
Use the linux "lockfile" command or "mkdir /var/lock/mylock" (see example of
the mkdir solution here: <http://wiki.bash-hackers.org/howto/mutex>)
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