[Impala-ASF-CR] IMPALA-12801: Increase query log default size and bound its memory.

["Riza Suminto (Code Review)" <ge...@cloudera.org>]

Hello Quanlong Huang, Abhishek Rawat, Yifan Zhang, Zihao Ye, Wenzhe Zhou, Impala Public Jenkins, 

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

    http://gerrit.cloudera.org:8080/21020

to look at the new patch set (#7).

Change subject: IMPALA-12801: Increase query_log_ default size and bound its memory.
......................................................................

IMPALA-12801: Increase query_log_ default size and bound its memory.

Coordinator's /queries page is useful to show information about recently
run and completed queries. Having more entries will be helpful to
inspect queries that completed further back. The maximum entry of this
table is controlled by 'query_log_size' flag. Higher value means more
queries to keep, but it also cost more memory overhead in coordinator.

This patch increase 'query_log_size' default value from 100 to 200. This
patch also add flag 'query_log_size_in_bytes' (default to 2GB) as an
additional safeguard to evict entry from query_log_ when this limit
exceeded, preventing query_log_ total memory to grow prohibitively
large. 'query_log_size_in_bytes' is used in combination with
'query_log_size' to limit the number of QueryStateRecord to retain in
query_log_, whichever is less.

Testing:
- Pass exhaustive tests.

Change-Id: I107e2c2c7f2b239557be37360e8eecf5479e8602
---
M be/src/service/impala-server.cc
M be/src/service/impala-server.h
M docs/topics/impala_webui.xml
M tests/custom_cluster/test_web_pages.py
M www/queries.tmpl
5 files changed, 110 insertions(+), 14 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/20/21020/7
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I107e2c2c7f2b239557be37360e8eecf5479e8602
Gerrit-Change-Number: 21020
Gerrit-PatchSet: 7
Gerrit-Owner: Riza Suminto <ri...@cloudera.com>
Gerrit-Reviewer: Abhishek Rawat <ar...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Riza Suminto <ri...@cloudera.com>
Gerrit-Reviewer: Wenzhe Zhou <wz...@cloudera.com>
Gerrit-Reviewer: Yifan Zhang <ch...@163.com>
Gerrit-Reviewer: Zihao Ye <ey...@163.com>