[Impala-ASF-CR] IMPALA-11027: Adding flag to enable support for ShellBasedUnixGroupMapping

["Amogh Margoor (Code Review)" <ge...@cloudera.org>]

Amogh Margoor has uploaded a new patch set (#2). ( http://gerrit.cloudera.org:8080/18019 )

Change subject: IMPALA-11027: Adding flag to enable support for ShellBasedUnixGroupMapping
......................................................................

IMPALA-11027: Adding flag to enable support for ShellBasedUnixGroupMapping

Currently, Impala doesn't support ShellBasedUnixGroupsMapping and
ShellBasedUnixGroupsNetgroupMapping to fetch Hadoop groups as they
spawn a new process and run shell command to fetch group info.
In Impala, this would happen for every session being created
when user delegation is enabled via impala.doas.user and
authorized_proxy_group_config. It can have many gotcha's like
spawning many processes together in a highly concurrent setting,
creation of zombie processes on abrupt crashing of impalad etc.

However, not everyone in ecosystem have moved away from shell based
group mapping. For instance, in cloudera distribution many components
still rely on it. So we need a way to allow users to use shell based
mapping instead of not allowing it altogether.
This patch provides flag which would allow  the support for users
that are aware about the gotchas it comes with.

Change-Id: I023f396a79f3aa27ad6ac80e91f527058a5a5470
---
M be/src/service/frontend.cc
M be/src/util/backend-gflag-util.cc
M common/thrift/BackendGflags.thrift
M docs/topics/impala_delegation.xml
M fe/src/main/java/org/apache/impala/service/BackendConfig.java
M fe/src/main/java/org/apache/impala/service/JniFrontend.java
6 files changed, 18 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/19/18019/2
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I023f396a79f3aa27ad6ac80e91f527058a5a5470
Gerrit-Change-Number: 18019
Gerrit-PatchSet: 2
Gerrit-Owner: Amogh Margoor <am...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>