[Impala-ASF-CR] IMPALA-4689: Fix computation of last active time

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

Lars Volker has uploaded a new patch set (#2).

Change subject: IMPALA-4689: Fix computation of last active time
......................................................................

IMPALA-4689: Fix computation of last active time

The last active time in impala-server.cc#L1806 is in milliseconds, but
the TimestampValue c'tor expects seconds. This change also renames some
variables to make their meaning more explicit, aiming to prevent similar
bugs in the future.

This change also fixes a bug that occurred when during startup of the
local minicluster the operating system PIDs would wrap around. This way
the first impalad would not be the one with the smallest PID and
ImpalaCluster.get_first_impalad() would return the wrong one.

I ran git-clang-format on the change.

Change-Id: I283564c8d8e145d44d9493f4201555d3a1087edf
---
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/service/query-exec-state.cc
M be/src/service/query-exec-state.h
M tests/common/impala_cluster.py
M tests/custom_cluster/test_query_expiration.py
7 files changed, 35 insertions(+), 26 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/46/5546/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I283564c8d8e145d44d9493f4201555d3a1087edf
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Thomas Tauber-Marshall <tm...@cloudera.com>