1.表象

java.util.concurrent.TimeoutException
 at java.util.concurrent.FutureTask.get(FutureTask.java:205)
 at net.sourceforge.squirrel_sql.client.mainframe.action.OpenConnectionCommand.awaitConnection(OpenConnectionCommand.java:113)
 at net.sourceforge.squirrel_sql.client.mainframe.action.OpenConnectionCommand.lambda$execute$1(OpenConnectionCommand.java:97)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)

2.深究原因，找到日志在

启动SQuirreL，可以通过Windows->View SQuirrel Logs查看运行日志。看到 could not resolve do2cloud02 , please check your network在hosts文件加了记录后问题解决

参考：https://yq.aliyun.com/articles/630486

           http://hbase.group/question/200