Hello David Ribeiro Alves, Todd Lipcon,

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

    http://gerrit.cloudera.org:8080/6837

to review the following change.

Change subject: fs_manager: optimize tmp file deletion
......................................................................

fs_manager: optimize tmp file deletion

In a run of dense_node-itest, the bulk of CPU time[1] was spent
canonicalizing paths while cleaning up temporary files. This patch optimizes
that in two ways:
- Stop canonicalizing paths. We already canonicalize the WAL and data dir
  roots; that's good enough for admin-provided symlinks.
- Split WAL and data root cleaning, parallelizing the latter through the
  DataDirManager.

1. Though admittedly the majority of wall clock time was waiting on IO.

Change-Id: I07830f0cc3fd5da847361607c62a369c39e677d2
---
M src/kudu/fs/data_dirs.cc
M src/kudu/fs/fs_manager.cc
M src/kudu/fs/fs_manager.h
M src/kudu/util/env_util.cc
M src/kudu/util/env_util.h
5 files changed, 73 insertions(+), 57 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/37/6837/1
-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I07830f0cc3fd5da847361607c62a369c39e677d2
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Adar Dembo <[email protected]>
Gerrit-Reviewer: David Ribeiro Alves <[email protected]>
Gerrit-Reviewer: Todd Lipcon <[email protected]>

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