[Impala-ASF-CR] IMPALA-10711: Allow customizing startup's filesystem check

["Joe McDonnell (Code Review)" <ge...@cloudera.org>]

Hello Impala Public Jenkins, 

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

    http://gerrit.cloudera.org:8080/17570

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

Change subject: IMPALA-10711: Allow customizing startup's filesystem check
......................................................................

IMPALA-10711: Allow customizing startup's filesystem check

At startup, Impala runs JniFrontend::checkFileSystem() to verify
that it can list the root directory of the filesystem. Some
deployments would like to restrict Impala to a subdirectory
of the filesystem. In that circumstance, Impala may not have
access to the root of the filesystem and the startup check
will fail.

This adds the startup parameter: startup_filesystem_check_directories
to specify the directories to check in JniFrontend::checkFileSystem()
at startup. For deployments that are restricted to a subdirectory,
startup_filesystem_check_directories=/some/subdirectory would
check /some/subdirectory rather than /. This parameter allows for
a list of directories in case it is useful to verify multiple
locations (such as different s3 buckets). If set to the empty string,
no directories will be checked.

Testing:
 - Added test_startup_filesystem_checks.py custom cluster test
 - Hand tested locally

Change-Id: I68e6802424f16002c90a37b3ae2490721525e58d
---
M be/src/util/backend-gflag-util.cc
M common/thrift/BackendGflags.thrift
M fe/src/main/java/org/apache/impala/service/BackendConfig.java
M fe/src/main/java/org/apache/impala/service/JniFrontend.java
A tests/custom_cluster/test_startup_filesystem_checks.py
5 files changed, 168 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/70/17570/2
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I68e6802424f16002c90a37b3ae2490721525e58d
Gerrit-Change-Number: 17570
Gerrit-PatchSet: 2
Gerrit-Owner: Joe McDonnell <jo...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>