就是執行這一步報錯，錯誤信息如下
[ERROR] Failed to execute goal org.codehaus.mojo:versions-maven-plugin:2.7:set (default-cli) on project ambari-metrics: Execution default-cli of goal org.codehaus.mojo:versions-maven-plugin:2.7:set failed: Plugin org.codehaus.mojo:versions-maven-plugin:2.7 or one of its dependencies could not be resolved: Failed to collect dependencies at org.codehaus.mojo:versions-maven-plugin:jar:2.7 -> org.apache.maven:maven-artifact:jar:2.2.1: Failed to read artifact descriptor for org.apache.maven:maven-artifact:jar:2.2.1: Could not transfer artifact org.apache.maven:maven-artifact:pom:2.2.1 from/to central (https://repo.maven.apache.org/maven2): Connect to repo.maven.apache.org:443 [repo.maven.apache.org/151.101.24.215] failed: 拒絕連接 (Connection refused) -> [Help 1]
打開下邊help1 那個網址大概意思就是jar包的問題，或者是網絡的問題。於是我找到了mavenjar包下載位置，找到了標綠的那個地方
刪除了整個version-maven-plugin文件夾，然后再次執行mvn versions:set -DnewVersion=2.7.3.0.0，成功！
