[kudu-CR] KUDU-668. log block manager should tolerate empty metadata

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

Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/4178

to look at the new patch set (#2).

Change subject: KUDU-668. log block manager should tolerate empty metadata
......................................................................

KUDU-668. log block manager should tolerate empty metadata

This solves a commonly seen issue after a server crashes due to "Too
many open files". In many cases, this type of crash would leave an empty
metadata file and a missing data file.

This isn't a full fix for KUDU-668, but handles the above common case by
just checking the size and existence of these files. If the metadata is
too small to be valid, and the data is empty, then we just remove the
container and continue with startup.

Change-Id: Ie4fd9d0f510835d100d35efaf541d34829118f56
---
M src/kudu/fs/block_manager-test.cc
M src/kudu/fs/log_block_manager.cc
M src/kudu/util/pb_util.cc
M src/kudu/util/pb_util.h
4 files changed, 69 insertions(+), 12 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/78/4178/2
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie4fd9d0f510835d100d35efaf541d34829118f56
Gerrit-PatchSet: 2
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>