Andrew Wong has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/15628 )

Change subject: ranger: enable log4j2 logging to files
......................................................................

ranger: enable log4j2 logging to files

This patch enables Kudu to generate a log4j2 properties file and pass it
to the Ranger client. This file is created in a directory specified by
the new --ranger_logging_config_dir flag, which, by default, will direct
the properties file to --log_dir. If the properties file already exists,
the existing file is honored. This means a file will not be regenerated
if one has already been generated -- I will add a follow up patch to
allow users to overwrite the file.

This properties file will direct logs to the directory pointed to by
--log_dir, and will honor the existing --max_log_files and
--max_log_size flags.

I've found logging to stdout and adjusting log42j log-level to be
useful, so this also adds --ranger_logtostdout and --ranger_log_level
for these respectively. I opted not to use the glog --minloglevel flag
since they don't quite map to log4j2 log levels (e.g. glog doesn't have
debug-level logging).

I manually tested that an existing properties file that has been
modified will be honored. Here's what's in a Ranger-configured Kudu
master's log directory:
 kudu-master.INFO -> 
kudu-master.awong-MBP16-21621.local.awong.log.INFO.20200403-122527.17165
 kudu-master.awong-MBP16-21621.local.awong.diagnostics.20200403-122527.0.17165
 kudu-master.awong-MBP16-21621.local.awong.log.INFO.20200403-122527.17165
 kudu-ranger-subprocess-log4j2.properties
 kudu-ranger-subprocess.awong-MBP16-21621.local.log

Change-Id: I7efa631832c219fce214304538e6ab6442062752
Reviewed-on: http://gerrit.cloudera.org:8080/15628
Reviewed-by: Grant Henke <granthe...@apache.org>
Tested-by: Andrew Wong <aw...@cloudera.com>
---
M java/kudu-subprocess/build.gradle
M src/kudu/ranger/mini_ranger.cc
M src/kudu/ranger/mini_ranger.h
M src/kudu/ranger/ranger_client-test.cc
M src/kudu/ranger/ranger_client.cc
M src/kudu/subprocess/CMakeLists.txt
A src/kudu/subprocess/subprocess_proxy.cc
M src/kudu/subprocess/subprocess_proxy.h
M src/kudu/util/env.h
9 files changed, 374 insertions(+), 65 deletions(-)

Approvals:
  Grant Henke: Looks good to me, approved
  Andrew Wong: Verified

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I7efa631832c219fce214304538e6ab6442062752
Gerrit-Change-Number: 15628
Gerrit-PatchSet: 12
Gerrit-Owner: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <a...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Attila Bukor <abu...@apache.org>
Gerrit-Reviewer: Grant Henke <granthe...@apache.org>
Gerrit-Reviewer: Hao Hao <hao....@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)

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