[Impala-CR](cdh5-trunk) IMPALA-2979: Fix scheduling on remote hosts

["Lars Volker (Code Review)" <ge...@cloudera.org>]

Lars Volker has uploaded a new patch set (#23).

Change subject: IMPALA-2979: Fix scheduling on remote hosts
......................................................................

IMPALA-2979: Fix scheduling on remote hosts

Also fixes: IMPALA-2400, IMPALA-3043

This change fixes scheduling scan-ranges on remote hosts by adding
remote backend selection capability to SimpleScheduler. Prior to this
change the scheduler would try to select a local backend even when
remote scheduling was requested.

This change also allows pseudo-randomized remote backend selection to
prevent convoying, which could happen when different independent
schedulers had the same internal state, e.g. after a cluster restart. To
enable the new behavior set the query option SCHEDULE_RANDOM_REPLICA to
true.

This change also fixes IMPALA-2400: Unpredictable locality behavior
for reading Parquet files

This change also fixes IMPALA-3043: SimpleScheduler does not handle
hosts with multiple IP addresses correctly

This change also does some clean-up in scheduler.h and
simple-scheduler.{h,cc}.

Change-Id: I044f83806fcde820fcb38047cf6b8e780d803858
---
M be/CMakeLists.txt
M be/src/scheduling/scheduler.h
M be/src/scheduling/simple-scheduler-test.cc
M be/src/scheduling/simple-scheduler.cc
M be/src/scheduling/simple-scheduler.h
M be/src/service/query-options.cc
M be/src/service/query-options.h
M common/thrift/ImpalaInternalService.thrift
M common/thrift/ImpalaService.thrift
M fe/src/main/java/com/cloudera/impala/analysis/TableRef.java
M fe/src/test/java/com/cloudera/impala/analysis/AnalyzeStmtsTest.java
M fe/src/test/java/com/cloudera/impala/analysis/ParserTest.java
M fe/src/test/java/com/cloudera/impala/analysis/ToSqlTest.java
13 files changed, 848 insertions(+), 432 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/00/2200/23
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I044f83806fcde820fcb38047cf6b8e780d803858
Gerrit-PatchSet: 23
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Marcel Kornacker <ma...@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mm...@cloudera.com>
Gerrit-Reviewer: anujphadke <ap...@cloudera.com>