[kudu-CR] KUDU-2095 - Add scanner `keepAlive` RPC call to Java API

["Tony Foerster (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins, Todd Lipcon, 

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

    http://gerrit.cloudera.org:8080/7749

to look at the new patch set (#8).

Change subject: KUDU-2095 - Add scanner `keepAlive` RPC call to Java API
......................................................................

KUDU-2095 - Add scanner `keepAlive` RPC call to Java API

- Adds keepAlive methods to sync and async clients
- Methods return a (Deferred) Status object

Where possible the behavior mimics the C++ client.

Publicly accessible methods are available in AsyncKuduScanner and
KuduScanner.

A call to KeepAlive will return a Status object which will be OK if
- The scanner has been initialized
- The scanner is active and has rows left to return
- The scanner is between tablets

It will return a non-ok status when
- The scanner has not yet been initialized
- The scanner has no more rows

Change-Id: Iba647e7b5ed4ee8d223d387b6656d3fb02c41713
---
A java/kudu-client/out/test/resources/log4j.properties
A java/kudu-client/out/test/resources/test-key-and-cert.jks
M java/kudu-client/src/main/java/org/apache/kudu/client/AsyncKuduClient.java
M java/kudu-client/src/main/java/org/apache/kudu/client/AsyncKuduScanner.java
M java/kudu-client/src/main/java/org/apache/kudu/client/KuduScanner.java
M java/kudu-client/src/test/java/org/apache/kudu/client/TestKuduClient.java
6 files changed, 212 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/49/7749/8
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Iba647e7b5ed4ee8d223d387b6656d3fb02c41713
Gerrit-Change-Number: 7749
Gerrit-PatchSet: 8
Gerrit-Owner: Tony Foerster <an...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Tony Foerster <an...@gmail.com>