Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/3628

to look at the new patch set (#13).

Change subject: Add time/watermark based garbage collection to ResultTracker
......................................................................

Add time/watermark based garbage collection to ResultTracker

This adds time and watermark based garbage collection to the ResultTracker.
Regarding time GC, there are two ttl's, a client ttl and a response ttl.

After the response ttl has elapsed, we garbage collect responses
but the ResultTracker remembers that it doesn't know them, so if
the client retries a request older than that it gets a meaningful
error back, stating that the request is stale.

After the client ttl period without hearing back from a client,
we gc the client state entirely, meaning all requests from that
client will be treated as new.

Regarding watermark GC the algorithm is simple, we trust the client
to tell us what's its lowest incomplete sequence number and we gc
everything below that.

This adds a simple test that makes sure this basically
works, and adds a multithreaded threaded test that runs GC at the
same time as writes.

Change-Id: I2c8e7b7191ca14842a31b64813ed498bdf626fa8
---
M src/kudu/integration-tests/exactly_once_writes-itest.cc
M src/kudu/rpc/CMakeLists.txt
R src/kudu/rpc/exactly_once_rpc-test.cc
M src/kudu/rpc/result_tracker.cc
M src/kudu/rpc/result_tracker.h
M src/kudu/rpc/retriable_rpc.h
M src/kudu/rpc/rpc_header.proto
M src/kudu/rpc/service_if.cc
M src/kudu/tablet/tablet_bootstrap.cc
M src/kudu/tablet/transactions/transaction_driver.cc
10 files changed, 374 insertions(+), 43 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/28/3628/13
-- 
To view, visit http://gerrit.cloudera.org:8080/3628
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I2c8e7b7191ca14842a31b64813ed498bdf626fa8
Gerrit-PatchSet: 13
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: David Ribeiro Alves <dral...@apache.org>
Gerrit-Reviewer: David Ribeiro Alves <dral...@apache.org>
Gerrit-Reviewer: Jean-Daniel Cryans <jdcry...@apache.org>
Gerrit-Reviewer: Kudu Jenkins

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