fix TLS reload doesn't work after delete cert file

[Daemonxiao]

Signed-off-by: Daemonxiao 735462752@qq.com

What problem does this PR solve?

TiSpark met some problem when use TLS Reload.

Problem Description: tryReload() is used as a task in ScheduledFuture. When tryReload() throws an exception, the schedule will be suppressed which makes tryReload() will not work.

What is changed and how does it work?

Add try-catch in tryReload().

    // If any execution of the task encounters an exception, subsequent executions are suppressed.
    private void tryReload() {
      // Add exception handling to avoid schedule stop.
      try {
        if (needReload()) {
          onChange.run();
        }
      } catch (Exception e) {
        logger.error("Failed to reload cert!" + e);
      }
    }

Code changes

• Has exported function/method change

Check List for Tests

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

• Unit test
• Integration test

Side effects

• NO side effects

Related changes

• Need to cherry-pick to the release branch

[codecov]

Codecov Report

Merging #609 (fdf0e13) into master (9ce52d3) will increase coverage by 0.02%.
The diff coverage is 76.92%.

@@             Coverage Diff              @@
##             master     #609      +/-   ##
============================================
+ Coverage     34.60%   34.63%   +0.02%     
+ Complexity     1418     1416       -2     
============================================
  Files           278      278              
  Lines         17342    17352      +10     
  Branches       1970     1971       +1     
============================================
+ Hits           6002     6009       +7     
  Misses        10732    10732              
- Partials        608      611       +3     

Impacted Files	Coverage Δ
...main/java/org/tikv/common/util/ChannelFactory.java	62.20% <53.84%> (-0.60%)	⬇️
.../org/tikv/common/apiversion/RequestKeyV2Codec.java	82.85% <100.00%> (+1.03%)	⬆️
...g/tikv/common/apiversion/RequestKeyV2RawCodec.java	100.00% <100.00%> (ø)
...g/tikv/common/apiversion/RequestKeyV2TxnCodec.java	100.00% <100.00%> (ø)
...rc/main/java/io/grpc/netty/NettyClientHandler.java	56.89% <0.00%> (-0.22%)	⬇️
...ty/handler/codec/http2/Http2ConnectionHandler.java	49.14% <0.00%> (+0.48%)	⬆️

---

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There is something need to change

[iosmanthus]

LGTM

[iosmanthus]

LGTM

[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. You are not a reviewer or committer or co-leader or leader.

[ti-srebot]

cherry pick to release-3.3 in PR #612