[kudu-CR] WIP: refactor log reading into an iterator-like interface

["Todd Lipcon (Code Review)" <ge...@cloudera.org>]

Todd Lipcon has uploaded a new change for review.

  http://gerrit.cloudera.org:8080/3038

Change subject: WIP: refactor log reading into an iterator-like interface
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WIP: refactor log reading into an iterator-like interface

This adds a new interface to iterate over a WAL one entry at a time.
This interface is both more natural to use and more performant: by
not materializing lots of entries in memory at the same time, the
allocator thread cache should be kept much hotter and a smaller
amount of memory can be reused, keeping CPU caches hotter.

Change-Id: I5727951664600b7a591a6c892ea1e62469ceb109
---
M src/kudu/consensus/log_util.cc
M src/kudu/consensus/log_util.h
2 files changed, 186 insertions(+), 118 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/38/3038/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I5727951664600b7a591a6c892ea1e62469ceb109
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Todd Lipcon <to...@apache.org>