Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/13583 )

Change subject: IMPALA-7467: Port ExecQueryFInstances to krpc
......................................................................

IMPALA-7467: Port ExecQueryFInstances to krpc

This patch ports the ExecQueryFInstances rpc to use KRPC. The
parameters for this call contain a huge number of Thrift structs
(eg. everything related to TPlanNode and TExpr), so to avoid
converting all of these to protobuf and the resulting effect that
would have on the FE and catalog, this patch stores most of the
parameters in a sidecar (in particular the TQueryCtx,
TPlanFragmentCtx's, and TPlanFragmentInstanceCtx's).

Testing:
- Passed a full exhaustive run on the minicluster.
Set up a ten node cluster with tpch 500:
- Ran perf tests: 3 iterations per tpch query, 4 concurrent streams,
  no perf change.
- Ran the stress test for 1000 queries, passed.

Change-Id: Id3f1c6099109bd8e5361188005a7d0e892147570
Reviewed-on: http://gerrit.cloudera.org:8080/13583
Reviewed-by: Thomas Tauber-Marshall <tmarsh...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M be/src/runtime/backend-client.h
M be/src/runtime/coordinator-backend-state.cc
M be/src/runtime/coordinator-backend-state.h
M be/src/runtime/query-exec-mgr.cc
M be/src/runtime/query-exec-mgr.h
M be/src/runtime/query-state.cc
M be/src/runtime/query-state.h
M be/src/runtime/test-env.cc
M be/src/service/control-service.cc
M be/src/service/control-service.h
M be/src/service/impala-internal-service.cc
M be/src/service/impala-internal-service.h
M common/protobuf/control_service.proto
M common/thrift/ImpalaInternalService.thrift
M tests/custom_cluster/test_rpc_timeout.py
15 files changed, 245 insertions(+), 188 deletions(-)

Approvals:
  Thomas Tauber-Marshall: Looks good to me, approved
  Impala Public Jenkins: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Id3f1c6099109bd8e5361188005a7d0e892147570
Gerrit-Change-Number: 13583
Gerrit-PatchSet: 6
Gerrit-Owner: Thomas Tauber-Marshall <tmarsh...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Michael Ho <k...@cloudera.com>
Gerrit-Reviewer: Thomas Tauber-Marshall <tmarsh...@cloudera.com>

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