[kudu-CR] [java client] improve AsyncKuduScanner logging

["Dan Burkert (Code Review)" <ge...@cloudera.org>]

Dan Burkert has submitted this change and it was merged. ( http://gerrit.cloudera.org:8080/8382 )

Change subject: [java client] improve AsyncKuduScanner logging
......................................................................

[java client] improve AsyncKuduScanner logging

As filed in KUDU-2199, in a jenkin's job build, ITClient test failed
even with fault tolerant scanner. The test log demonstrates that the
issue may cause by re-scan of scanned data. However, loop ITClient
10000 times and did not discover any issues:
  http://dist-test.cloudera.org/job?job_id=hao.hao.1508869382.32617

This patch improves test coverage of ITClient so that error will be
reported if row count of each scan ever unexpectedly decrease. It also
improves logging of AsyncKuduScanner to give more information for
diagnosis if the same issue occur again. Another 2000 runs of ITClient
with current patch passed:
  http://dist-test.cloudera.org/job?job_id=hao.hao.1509045968.14317

Change-Id: I90ffcd01e7f99f3090fa118092fc303e06fb92dc
Reviewed-on: http://gerrit.cloudera.org:8080/8382
Reviewed-by: Dan Burkert <da...@apache.org>
Tested-by: Kudu Jenkins
---
M java/kudu-client/src/main/java/org/apache/kudu/client/AsyncKuduScanner.java
R java/kudu-client/src/main/java/org/apache/kudu/client/FaultTolerantScannerExpiredException.java
M java/kudu-client/src/test/java/org/apache/kudu/client/ITClient.java
3 files changed, 22 insertions(+), 19 deletions(-)

Approvals:
  Dan Burkert: Looks good to me, approved
  Kudu Jenkins: Verified

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I90ffcd01e7f99f3090fa118092fc303e06fb92dc
Gerrit-Change-Number: 8382
Gerrit-PatchSet: 6
Gerrit-Owner: Hao Hao <ha...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Dan Burkert <da...@apache.org>
Gerrit-Reviewer: Hao Hao <ha...@cloudera.com>
Gerrit-Reviewer: Jean-Daniel Cryans <jd...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>