[kudu-CR] tracing: add a 'label' for child traces

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

Hello Mike Percy,

I'd like you to do a code review.  Please visit

    http://gerrit.cloudera.org:8080/2888

to review the following change.

Change subject: tracing: add a 'label' for child traces
......................................................................

tracing: add a 'label' for child traces

Currently, when a trace has a child trace, it's not obvious
how it's related to the parent. This adds a simple label.

Change-Id: I2b9a7655131c1013fea26e5bc87651b38ff1920f
---
M src/kudu/tablet/transactions/transaction_driver.cc
M src/kudu/util/memory/arena.h
M src/kudu/util/trace-test.cc
M src/kudu/util/trace.cc
M src/kudu/util/trace.h
5 files changed, 39 insertions(+), 13 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/88/2888/1
-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I2b9a7655131c1013fea26e5bc87651b38ff1920f
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Mike Percy <mp...@apache.org>