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Subject: Re: Obtaining hadoop lib dir location
From: Jon Maron <jmaron@hortonworks.com>
In-Reply-To: <88B74890-B404-4087-BDFD-E6ABA6DDBF89@apache.org>
Date: Wed, 4 Sep 2013 15:51:01 -0400
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 <88B74890-B404-4087-BDFD-E6ABA6DDBF89@apache.org>
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I'm asking this in the context of the savanna openstack project.  The HDP p=
lugin supports the installation of the HDP stack via Ambari.  However, for =
a specific feature we need to place an additional jar in the lib directory =
of the installation on the various cluster VMs post installation before we =
transition the cluster services to START.

I suppose the approach you suggest may work, but it may be daunting in the =
case of a horizontal service (a service potentially leveraged by multiple o=
ther services) or the case where services may be added to the cluster post =
installation.  I'm not even certain if all service allow the manipulation o=
f their class path in the manner you indicate?

Is it safe to assume that, for a given RPM, the hadoop lib directory will b=
e in specific location (e.g. in my case, an installation of HDP 1.3 has a l=
ib location of /usr/lib/hadoop/lib)?

-- Jon
=20
On Sep 4, 2013, at 1:33 PM, Hitesh Shah <hitesh@apache.org> wrote:

> Hi Jon
>=20
> You might be approaching this in the wrong way. Why not install the jar w=
herever you need to and then update the appropriate hadoop configs to ensur=
e that the jar is pulled into the classpath of the appropriate component?=
=20
>=20
> -- Hitesh
>=20
> On Sep 4, 2013, at 8:21 AM, Jon Maron wrote:
>=20
>> Hi,
>>=20
>> I have a need to programmatically add a jar to the hadoop lib directory =
prior to the start of the hadoop services on the cluster hosts (In other wo=
rds, prior to invoking the REST URI to transition the cluster services to S=
TART).  I am trying to figure out whether there is a REST query I can execu=
te to obtain a property value that would tell me where that lib directory i=
s located or would allow me to infer the location.  Any thoughts?
>>=20
>> -- Jon
>>=20
>>=20
>> --=20
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>=20


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NOTICE: This message is intended for the use of the individual or entity to=
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which it is addressed and may contain information that is confidential,=20
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