Alexey Serbin has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/18222 )

Change subject: [java] KUDU-3349 Fix the failure to demote a leader
......................................................................

[java] KUDU-3349 Fix the failure to demote a leader

KuduScanToken gets a wrong tserver's uuid whose format is something
like: '<ByteString@6dffd497 size=32 
contents="fc07f681d3ea4bab9bc5ec8090ab9437">',
the expected uuid should be "fc07f681d3ea4bab9bc5ec8090ab9437".

This issue caused RemoteTablet to fail to demote a leader, and the java
client always sends write ops to the demoted leader. As a result, there
are a lot of "PendingErrors overflowed. Failed to write at least 1000 rows to 
Kudu".

After this fix, the write ops, especially the deleting, will be faster.

Change-Id: I2974b6ec2cec2f0120b113d1bcf89fe3793a1ec5
Reviewed-on: http://gerrit.cloudera.org:8080/18166
Tested-by: Kudu Jenkins
Reviewed-by: Alexey Serbin <[email protected]>
(cherry picked from commit 90895ce76590f10730ad7aac3613b69d89ff5422)
Reviewed-on: http://gerrit.cloudera.org:8080/18222
Tested-by: Alexey Serbin <[email protected]>
Reviewed-by: Attila Bukor <[email protected]>
---
M java/kudu-client/src/main/java/org/apache/kudu/client/KuduScanToken.java
M java/kudu-client/src/test/java/org/apache/kudu/client/TestScanToken.java
2 files changed, 172 insertions(+), 24 deletions(-)

Approvals:
  Alexey Serbin: Verified
  Attila Bukor: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: branch-1.16.x
Gerrit-MessageType: merged
Gerrit-Change-Id: I2974b6ec2cec2f0120b113d1bcf89fe3793a1ec5
Gerrit-Change-Number: 18222
Gerrit-PatchSet: 2
Gerrit-Owner: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Abhishek Chennaka <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Attila Bukor <[email protected]>
Gerrit-Reviewer: Hongjiang Zhang <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)

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