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[ISSUE #4274] skip master-select task when db num is 1 #4785

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[ISSUE #4274] skip master-select task when db num is 1 #4785

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zhangcly
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Please do not create a Pull Request without creating an issue first.

What is the purpose of the change

fix #4274

Brief changelog

XX

Verifying this change

XXXX

Follow this checklist to help us incorporate your contribution quickly and easily:

  • Make sure there is a Github issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
  • Format the pull request title like [ISSUE #123] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.
  • Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
  • Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
  • Run mvn -B clean package apache-rat:check findbugs:findbugs -Dmaven.test.skip=true to make sure basic checks pass. Run mvn clean install -DskipITs to make sure unit-test pass. Run mvn clean test-compile failsafe:integration-test to make sure integration-test pass.

@zhangcly zhangcly closed this Jan 23, 2021
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内部数据库容灾(只有一个)
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