Hello Jean-Daniel Cryans, Mike Percy,

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

    http://gerrit.cloudera.org:8080/3705

to review the following change.

Change subject: ksck: multi-thread the fetching of replica info from tablet 
servers
......................................................................

ksck: multi-thread the fetching of replica info from tablet servers

In clusters with a lot of tablets, fetching the data from each tablet server
can take a while (eg ~100ms per server from my laptop to a test cluster in our
datacenter). For a large cluster (~70 nodes), this makes ksck rather slow.

Multi-threading the fetching makes this much faster (5s vs original 31 seconds
for the above test cluster).

Change-Id: Ib7784697fb227743dccaa98922fb958cd6a3270e
---
M src/kudu/tools/ksck.cc
1 file changed, 22 insertions(+), 7 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/05/3705/1
-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ib7784697fb227743dccaa98922fb958cd6a3270e
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Todd Lipcon <t...@apache.org>
Gerrit-Reviewer: Jean-Daniel Cryans <jdcry...@apache.org>
Gerrit-Reviewer: Mike Percy <mpe...@apache.org>

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