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Name node is in safe mode. Not able to leave

...d: bin/hadoop dfsadmin -safemode leave You are getting Unknown command error for your command as -safemode isn't a sub-command for hadoop fs, but it is of hadoop dfsadmin. Also after the above command, I would suggest you to once run hadoop fsck so that any inconsistencies crept in the hdfs mig...
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App Inventor 2 源码商店

... 蓝牙BLE硬件接入及IO控制 ...
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在APP Inventor的BLE组件使用RequestMTU方法之后,发送的字符数依旧限制在2...

目前APP是能连接蓝牙,也能传输数据,但是发送和接受的数据都是20字节的分包。使用BLE调试宝,在里面修改MTU,返回的值是512,并且是修改成功的,但是在编程中使用RequestMTU方式设置512,,并且读取返回值也是512,然后调用...
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Mind+ 掌控板、ESP32开发板等硬件如何接入AppInventor? - 创客硬件开发 - ...

...通信方式,及使用什么组件。一般不外乎2种方式: 1、蓝牙(经典蓝牙),使用 蓝牙客户端 组件。Mind+ 参考代码如下: 2、WIFI(TCP服务器),使用ClientSocketAI2Ext 拓展。
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Callback when CSS3 transition finishes

...AnimationEnd MSAnimationEnd", function(){ ... }); Note that you can pass all of the browser prefixed event strings into the bind() method simultaneously to support the event firing on all browsers that support it. Update: Per the comment left by Duck: you use jQuery's .one() method to ensure the...
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OS X10.9 环境下部署 QT5.3.1 常见的编译问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...文章不多。 安装过程一般不会有太大的问题,最多就是提示你需要安装 Xcode命令行工具 ,根据提示安装便可。 安装后新建测试,编译报如下错误: 错误描述及解决方法 1、:-1: error: Xcode not set up properly. You may need to confirm the l...
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Programmatically Determine a Duration of a Locked Workstation?

... Wow, works amazing! no errors no exceptions, smooth and clean! – Mayer Spitzer Oct 25 '17 at 17:39 ...
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Java client certificates over HTTPS/SSL

...r client to be able to call the SSL web service and ignore SSL certificate errors, just put this statement before you invoke any web services: System.setProperty("axis.socketSecureFactory", "org.apache.axis.components.net.SunFakeTrustSocketFactory"); The usual disclaimers about this being a Very...
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Discuz 找回密码时提示参数错误 - 更多技术 - 清泛网 - 专注C/C++及内核技术

Discuz 找回密码时提示参数错误source module member member_getpasswd.php第32行找到$uid = $_GET['uid'];在下方添加一行$sign = $_GET['sign'];tem...source\module\member\member_getpasswd.php 第32行找到 $uid = $_GET['uid']; 在下方添加一行 $sign = $_GET['sign']; t...
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用户反馈ble广播数据收不到 - 用户反馈 - 清泛IT社区,为创新赋能!

...货 https://e.tb.cn/h.6aRrSlnXdQZHKA3?tk=lQbTeqbXx8Z CZ225 「主从一体蓝牙模块串口无线通信高速透传输模组BLE5.3低功耗BT36」 点击链接直接打开 或者 淘宝搜索直接打开 清泛: 我其他 ble 硬件应该也能收发广播 清泛: 后面试试 MCU&amp...