[kudu-CR] KUDU-3498 Scanner keeps alive in periodically

["Wang Xixu (Code Review)" <ge...@cloudera.org>]

Hello Mahesh Reddy, Kudu Jenkins, 

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

    http://gerrit.cloudera.org:8080/20282

to look at the new patch set (#2).

Change subject: KUDU-3498 Scanner keeps alive in periodically
......................................................................

KUDU-3498 Scanner keeps alive in periodically

Kudu caches the scanner id in the tablet server for continuing
reading. It will be expired if the idle time is over the defined
scanner ttl time. Sometimes the client reads a batch of data,
if the data is every large, it takes a long time to handle it.
Then the client reads the next batch using the same scanner, the
scanner will be expired even if it has send a keep alive requests.

This patch supports to keep scanner alive in periodically. It uses
a timer to send keep alive requests background. So, it will never
be expired.

Change-Id: I1165d96814eb4bcd5db9b5cb60403fffc5b18c81
---
M src/kudu/client/client-test.cc
M src/kudu/client/client.cc
M src/kudu/client/client.h
M src/kudu/client/scanner-internal.cc
M src/kudu/client/scanner-internal.h
5 files changed, 78 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/82/20282/2
-- 
To view, visit http://gerrit.cloudera.org:8080/20282
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I1165d96814eb4bcd5db9b5cb60403fffc5b18c81
Gerrit-Change-Number: 20282
Gerrit-PatchSet: 2
Gerrit-Owner: Wang Xixu <14...@qq.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Mahesh Reddy <mr...@cloudera.com>