我想在Apache Spark中启用单个集群,我安装了java和scala.我为Apache Hadoop 2.6下载了火花并解压缩.我试图转动spark-shell但是却抛出了一个错误,另外,我无法访问shell中的sc.我从源代码编译但是同样的错误.我究竟做错了什么？
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java.net.BindException: Failed to bind to: ADMINISTRATOR.home/192.168.1.5:0: Service 'sparkDriver' failed after 16 retries!
at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:272)
at akka.remote.transport.netty.NettyTransport$$anonfun$listen$1.apply(NettyTransport.scala:393)
at akka.remote.transport.netty.NettyTransport$$anonfun$listen$1.apply(NettyTransport.scala:389)
at scala.util.Success$$anonfun$map$1.apply(Try.scala:206)
at scala.util.Try$.apply(Try.scala:161)
at scala.util.Success.map(Try.scala:206)
at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) …我尝试连接到我的Cassandra但我可能错误地配置了.我在localhost上运行它.Cassandra已经生成了认证和添加.在cqlsh中,flag -ssl没有错误.我的片段代码是
var tls = require('tls');
var fs = require('fs');
var options = {
key : fs.readFileSync('client-key.pem'),
cert : fs.readFileSync('client-cert.pem'),
ca : [fs.readFileSync('server-cert.pem')]
};
var client = new cassandra.Client({
contactPoints : ['127.0.0.1'],
authProvider : new cassandra.auth.PlainTextAuthProvider('cassandra', 'cassandra'),
sslOptions : tls.connect(options)
});我做错了什么？请帮忙!
我对文本进行编码时遇到问题
\n\nvar description = "jak u\xc5\xbcywa\xc4\x87?"\r\n var blob = new Blob([description], {\r\n type: "text/plain;charset=utf-8;"\r\n });\r\n var url = URL.createObjectURL(blob);\r\n console.log(url)我在哪里输入 url 我的描述不一样并返回 jak u\xc4\xb9\xc5\xbaywa\xc3\x84？我做错了什么？
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