Hello Tim Armstrong, Dan Hecht,

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

    http://gerrit.cloudera.org:8080/10060

to look at the new patch set (#9).

Change subject: IMPALA-5216: Make admission control queuing async
......................................................................

IMPALA-5216: Make admission control queuing async

Implement asynchronous admission control queuing. This is achieved by
running the admission control code-path in a separate thread. Major
changes include: propagating cancellation to the admission control
thread and dequeuing thread, and adding a new Query Operation State
called "PENDING" that represents the state between completion of
planning and starting of query execution.

Testing:
- Added a deterministic end to end test
- Ran multiple stress tests successfully with a cancellation probability
of 60% and with different values for the following parameters:
max_requests, queue_wait_timeout_ms. Ensured that the impalad was in a
valid state afterwards (no orphan fragments or wrong metrics).
- Ran all exhaustive tests and ASAN core tests successfully.

TODO: change terminology of "in_flight_query" to "submitted_queries".
      Need to identify all references of this terminology, eg. in
      comments, tests, variable names, etc.

Change-Id: I989cf5b259afb8f5bc5c35590c94961c81ce88bf
---
M be/src/common/atomic.h
M be/src/common/logging.h
M be/src/runtime/coordinator.cc
M be/src/runtime/coordinator.h
M be/src/scheduling/admission-controller.cc
M be/src/scheduling/admission-controller.h
M be/src/scheduling/query-schedule.cc
M be/src/scheduling/query-schedule.h
M be/src/service/client-request-state.cc
M be/src/service/client-request-state.h
M be/src/service/impala-beeswax-server.cc
M be/src/service/impala-hs2-server.cc
M be/src/service/impala-http-handler.cc
M be/src/service/impala-server.cc
M be/src/service/impala-server.h
M be/src/util/debug-util.cc
M be/src/util/debug-util.h
M be/src/util/promise-test.cc
M be/src/util/promise.h
M common/thrift/ImpalaService.thrift
M testdata/workloads/functional-query/queries/QueryTest/runtime_row_filters.test
M tests/authorization/test_authorization.py
M tests/beeswax/impala_beeswax.py
M tests/common/impala_connection.py
M tests/custom_cluster/test_admission_controller.py
M tests/custom_cluster/test_krpc_mem_usage.py
M tests/hs2/hs2_test_suite.py
M tests/hs2/test_hs2.py
M tests/query_test/test_observability.py
M www/query_backends.tmpl
30 files changed, 656 insertions(+), 232 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/60/10060/9
--
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I989cf5b259afb8f5bc5c35590c94961c81ce88bf
Gerrit-Change-Number: 10060
Gerrit-PatchSet: 9
Gerrit-Owner: Bikramjeet Vig <bikramjeet....@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bikramjeet....@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhe...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>

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