[kudu-CR] deltafile-test: DeltaFileIterator fuzz test

["Adar Dembo (Code Review)" <ge...@cloudera.org>]

Hello Mike Percy, Kudu Jenkins, Grant Henke, Todd Lipcon, 

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

    http://gerrit.cloudera.org:8080/11140

to look at the new patch set (#4).

Change subject: deltafile-test: DeltaFileIterator fuzz test
......................................................................

deltafile-test: DeltaFileIterator fuzz test

Here's a new fuzz test for deltafile-test that generates random deltas and
iterates at random snapshots over it, testing the various delta iterator
functions.

The test introduces MirroredDeltas, a utility that's useful for tracking
deltas that are written into a delta file (or into a DMS, for that matter).

I snuck in a change to map-util.h that I ultimately didn't use, but could be
useful for others.

Change-Id: I539ff0f2055cf398a42efb824238188230e25516
---
M src/kudu/gutil/map-util.h
M src/kudu/tablet/CMakeLists.txt
M src/kudu/tablet/delta_key.h
M src/kudu/tablet/delta_store.h
M src/kudu/tablet/deltafile-test.cc
A src/kudu/tablet/tablet-test-util.cc
M src/kudu/tablet/tablet-test-util.h
7 files changed, 469 insertions(+), 11 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/40/11140/4
-- 
To view, visit http://gerrit.cloudera.org:8080/11140
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I539ff0f2055cf398a42efb824238188230e25516
Gerrit-Change-Number: 11140
Gerrit-PatchSet: 4
Gerrit-Owner: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Grant Henke <gr...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>