[kudu-CR] KUDU-3318 [LBM] Runtime compact log container metadata

["Yingchun Lai (Code Review)" <ge...@cloudera.org>]

Hello Tidy Bot, Kudu Jenkins, 

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

    http://gerrit.cloudera.org:8080/17871

to look at the new patch set (#3).

Change subject: KUDU-3318 [LBM] Runtime compact log container metadata
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KUDU-3318 [LBM] Runtime compact log container metadata

In commit 49abc3a6788bc29c8c023cafff0f0955142a2409, we have added
a logic to make log container metadata file to be full, then no
more CREATE type blocks will be appended to this container. However,
the metadata will still consuming disk space even if it's in a very
low live ratio.
This patch adds a method to compact metadata when found it's in low
live ratio when append DELETE type blocks to it.

Change-Id: I72bdf73fa73403918c01dfa9d45530fad47ecaf6
---
M src/kudu/fs/log_block_manager-test.cc
M src/kudu/fs/log_block_manager.cc
2 files changed, 281 insertions(+), 54 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/71/17871/3
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I72bdf73fa73403918c01dfa9d45530fad47ecaf6
Gerrit-Change-Number: 17871
Gerrit-PatchSet: 3
Gerrit-Owner: Yingchun Lai <ac...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)