[kudu-CR] [quorum util] update criteria for replica eviction

["Alexey Serbin (Code Review)" <ge...@cloudera.org>]

Hello Mike Percy, Kudu Jenkins, 

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

    http://gerrit.cloudera.org:8080/8679

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

Change subject: [quorum_util] update criteria for replica eviction
......................................................................

[quorum_util] update criteria for replica eviction

Updated the replica eviction criteria in consensus::CanEvictReplica()
to address a scenario where newly added replicas fail one after
another before the original failed replica evicted.  This is to make
sure it does not end up with placing failed replicas at every available
tablet server, deadlocking the replacement process.

Added corresponding unit tests to cover the updated behavior of
consensus::CanEvictReplica().

Change-Id: I2062c2963fface43062b3154bf5ffa61b4fa684f
---
M src/kudu/consensus/quorum_util-test.cc
M src/kudu/consensus/quorum_util.cc
M src/kudu/integration-tests/raft_consensus_nonvoter-itest.cc
3 files changed, 298 insertions(+), 74 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/79/8679/2
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I2062c2963fface43062b3154bf5ffa61b4fa684f
Gerrit-Change-Number: 8679
Gerrit-PatchSet: 2
Gerrit-Owner: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>