fix byte overflow

[shiyuhang0]

What problem does this PR solve?

#717

What is changed and how does it work?

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has methods of interface change
• Has persistent data change
• No code

Check List for Tests

This PR has been tested by at least one of the following methods:

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Possible performance regression, WHY: TBD
• Increased code complexity, WHY: TBD
• Breaking backward compatibility, WHY: TBD
• NO side effects

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note
• NO related changes

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.15 🎉

Comparison is base (c1c804c) 37.98% compared to head (d624064) 38.14%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #728      +/-   ##
============================================
+ Coverage     37.98%   38.14%   +0.15%     
- Complexity     1611     1612       +1     
============================================
  Files           278      278              
  Lines         17482    17482              
  Branches       1986     1986              
============================================
+ Hits           6641     6668      +27     
+ Misses        10184    10157      -27     
  Partials        657      657              

Impacted Files	Coverage Δ
src/main/java/org/tikv/common/codec/RowV2.java	0.00% <0.00%> (ø)
src/main/java/org/tikv/txn/TxnExpireTime.java	63.15% <0.00%> (-10.53%)	⬇️
src/main/java/io/grpc/internal/ClientCallImpl.java	57.14% <0.00%> (-0.25%)	⬇️
src/main/java/org/tikv/common/PDClient.java	57.79% <0.00%> (+0.91%)	⬆️
...n/java/org/tikv/common/util/ConcreteBackOffer.java	86.95% <0.00%> (+1.73%)	⬆️
.../main/java/org/tikv/common/AbstractGRPCClient.java	44.87% <0.00%> (+2.56%)	⬆️
...rc/main/java/io/grpc/netty/NettyClientHandler.java	59.69% <0.00%> (+4.74%)	⬆️

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[ti-srebot]

@zhangyangyu, Thanks for your review. The bot only counts LGTMs from Reviewers and higher roles, but you're still welcome to leave your comments. get siglist: dial tcp 172.16.4.167:34000: connect: no route to host

[ti-chi-bot]

In response to a cherrypick label: cannot checkout 3.3: error checking out 3.3: exit status 1. output: error: pathspec '3.3' did not match any file(s) known to git

[shiyuhang0]

/cherry-pick release-3.3

[ti-chi-bot]

@shiyuhang0: new pull request created to branch release-3.3: #729.

In response to this:

/cherry-pick release-3.3

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