[Impala-CR](cdh5-trunk) IMPALA-3306: Add command-line flags to set S3 access configurations

["Sailesh Mukil (Code Review)" <ge...@cloudera.org>]

Sailesh Mukil has uploaded a new change for review.

  http://gerrit.cloudera.org:8080/2850

Change subject: IMPALA-3306: Add command-line flags to set S3 access configurations
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IMPALA-3306: Add command-line flags to set S3 access configurations

This patch adds two flags, namely 's3a_access_key_cmd' and
's3a_secret_key_cmd' each of which should be a Unix command that
would retrieve the S3 access key and the S3 secret key respectively.
These keys are used when creating a connection to S3 so that Impala
is given access.

This patch eliminates the need to pass the S3 access and secret keys
through the world readable core-site.xml for Impala.

P.S: The Hive Metastore still needs the S3 keys in it's core-site as
we do not have control over that.

Change-Id: I2ba103bcb399861683066fd00219d30c180db043
---
M be/src/common/init.cc
M be/src/runtime/hdfs-fs-cache.cc
M be/src/runtime/hdfs-fs-cache.h
3 files changed, 46 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/50/2850/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I2ba103bcb399861683066fd00219d30c180db043
Gerrit-PatchSet: 1
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Sailesh Mukil <sa...@cloudera.com>