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Subject: Re: Review Request 37758: Ambari startup scripts exhibit long delays
 (5+
 seconds each) on every "modifying user" operation. This adds a few minutes
 to the time it takes to start or restart any component,
 causing excessive downtime for every config change.
From: "Andrew Onischuk" <aonishuk@hortonworks.com>
To: "Dmitro Lisnichenko" <dlysnichenko@hortonworks.com>,
 "Vitalyi Brodetskyi" <vbrodetskyi@hortonworks.com>
Cc: "Andrew Onischuk" <aonishuk@hortonworks.com>,
 "Ambari" <dev@ambari.apache.org>
Date: Tue, 25 Aug 2015 14:48:36 -0000
Message-ID: <20150825144836.13583.15601@reviews.apache.org>
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Sender: "Andrew Onischuk" <noreply@reviews.apache.org>
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Reply-To: "Andrew Onischuk" <aonishuk@hortonworks.com>

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/37758/
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(Updated Aug. 25, 2015, 2:48 p.m.)


Review request for Ambari, Dmitro Lisnichenko and Vitalyi Brodetskyi.


Bugs: AMBARI-12871
    https://issues.apache.org/jira/browse/AMBARI-12871


Repository: ambari


Description
-------

PROBLEM: Customer use nslcd to fetch the user from AD server, it returns a lot
of users and groups, this will slow down the ambari operation (start/stop
service). As discussed with Florian Barca, The root cause is a limitation in
the native API: grp.getgrall() has no ability to prefilter the results, which
means it fetches all users from the LDAP directory exposed by nslcd. If it
happen to be a large org, with a large number of users, so the fetch takes a
long time. We need to optimize this and make the code scale with the number of
users.


Diffs (updated)
-----

  ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-ANY/scripts/shared_initialization.py 4def30f 
  ambari-server/src/test/python/stacks/2.0.6/hooks/before-ANY/test_before_any.py 37a52df 

Diff: https://reviews.apache.org/r/37758/diff/


Testing
-------

mvn clean test


Thanks,

Andrew Onischuk


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