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Date: Wed, 20 Apr 2016 21:31:30 +0000 (UTC)
From: Di Li <lovelycoast@yahoo.com.INVALID>
Reply-To: Di Li <lovelycoast@yahoo.com>
To: Ambari <dev@ambari.apache.org>
Message-ID: <226822507.4693393.1461187890114.JavaMail.yahoo@mail.yahoo.com>
Subject: "detected unhandled Python exception" in RHEL's /var/log/messages
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Hello folks,

I noticed that everytime Ambari Python script fails with unexpected excepti=
on. A "detected unhandled Python exception" error message is logged in /var=
/log/messages.=C2=A0 For example, the Install Package step may fail due to =
corrupted HDP yum repo cache. When that happened, I saw the following error=
 message logged in /var/logs/messages.
Apr 11 11:17:55 bdavm1251 abrt: detected unhandled Python exception in '/va=
r/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py'

It seemed to me that the "unhandled" exception was from the execute() metho=
d in script.py as shown below. where the method has "try" and "finally" but=
 no "expect" part. The script used to catch the exception. The pieces was r=
emoved via AMBARI-11242 as part of the Ambari server/agent performance opti=
mization.

Could someone explain to me why the "expect" was removed ? Should "expect" =
be added back so arbt on RHEL will not log errors into /var/log/messages ?

try:
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 method =3D self.choose_method_to_execute(sel=
f.command_name)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 with Environment(self.basedir, tmp_dir=3DScr=
ipt.tmp_dir) as env:
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 env.config.download_path =3D Scr=
ipt.tmp_dir
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 method(env)
=C2=A0=C2=A0=C2=A0 finally:
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if self.should_expose_component_version(self=
.command_name):
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 self.save_component_version_to_s=
tructured_out()


Thanks.

Di

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