[kudu-CR] KUDU-2437 Split a tablet into primary key ranges by size

["Yao Xu (Code Review)" <ge...@cloudera.org>]

Hello Dan Burkert, Kudu Jenkins, Todd Lipcon, 

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

    http://gerrit.cloudera.org:8080/10406

to look at the new patch set (#15).

Change subject: KUDU-2437 Split a tablet into primary key ranges by size
......................................................................

KUDU-2437 Split a tablet into primary key ranges by size

When reading data in a kudu table using spark,
if there is a large amount of data in the tablet,
reading the data takes a long time. The reason
is that KuduRDD uses a tablet to generate the
scanToken, so a spark task needs to process all
the data in a tablet.

TabletServer should provide an RPC interface,
which can be split tablet into multiple primary
key ranges by size. The kudu-client can choose
whether to perform parallel scan according to
the case.

Change-Id: I9ec4395919f4b54102e458ef5154334c08412e8a
---
M src/kudu/common/CMakeLists.txt
M src/kudu/common/common.proto
A src/kudu/common/key_range.cc
A src/kudu/common/key_range.h
M src/kudu/tablet/cfile_set.cc
M src/kudu/tablet/cfile_set.h
M src/kudu/tablet/diskrowset.cc
M src/kudu/tablet/diskrowset.h
M src/kudu/tablet/memrowset.h
M src/kudu/tablet/mock-rowsets.h
M src/kudu/tablet/rowset.cc
M src/kudu/tablet/rowset.h
M src/kudu/tablet/rowset_info.cc
M src/kudu/tablet/rowset_info.h
M src/kudu/tablet/tablet-harness.h
M src/kudu/tablet/tablet-test-util.h
M src/kudu/tablet/tablet-test.cc
M src/kudu/tablet/tablet.cc
M src/kudu/tablet/tablet.h
M src/kudu/tserver/tablet_service.cc
M src/kudu/tserver/tablet_service.h
M src/kudu/tserver/tserver.proto
M src/kudu/tserver/tserver_service.proto
23 files changed, 730 insertions(+), 6 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/06/10406/15
-- 
To view, visit http://gerrit.cloudera.org:8080/10406
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I9ec4395919f4b54102e458ef5154334c08412e8a
Gerrit-Change-Number: 10406
Gerrit-PatchSet: 15
Gerrit-Owner: Yao Xu <oc...@gmail.com>
Gerrit-Reviewer: Dan Burkert <da...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Yao Xu <oc...@gmail.com>