Hello Dimitris Tsirogiannis, Zoram Thanga, Tim Armstrong,

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/9000

to look at the new patch set (#2).

Change subject: IMPALA-6384: RequestPoolService should honor custom group 
mapping config
......................................................................

IMPALA-6384: RequestPoolService should honor custom group mapping config

Due to the way in which we instantiate fair scheduler allocation
loader, we donot read the config overrides from the HDFS config
files.

This is an unexpected behavior from users' POV since we typically
support overrides like custom user -> group mapping via HDFS
config (for ex: LDAPGroupsMapping) that eventually affects the
query -> pool assignment.

Fix: This patch loads the hadoop default configuration so that the
underlying QueuePlacementPolicy is based on user specified overrides.

Testing (manual): Changed the core-site.xml to use LDAPGroupsMapping
instead of the default ShellBasedUnixGroupsMapping and confirmed that
the correct group mapping plugin is loaded, by adding additional logging.

Also, modified TestRequestPoolService to assert that the core-site xml
overrides are loaded.

Change-Id: Ibb93870c0cc37e2432a643a274931f1d3d13fb96
---
M 
common/yarn-extras/src/main/java/org/apache/impala/yarn/server/resourcemanager/scheduler/fair/QueuePlacementPolicy.java
M fe/src/main/java/org/apache/impala/util/RequestPoolService.java
M fe/src/test/java/org/apache/impala/util/TestRequestPoolService.java
M testdata/cluster/node_templates/common/etc/hadoop/conf/core-site.xml.tmpl
4 files changed, 32 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/00/9000/2
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ibb93870c0cc37e2432a643a274931f1d3d13fb96
Gerrit-Change-Number: 9000
Gerrit-PatchSet: 2
Gerrit-Owner: Bharath Vissapragada <bhara...@cloudera.com>
Gerrit-Reviewer: Dimitris Tsirogiannis <dtsirogian...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Zoram Thanga <zo...@cloudera.com>

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