如果我有一个清单
lst = ['A', 'B', 'C']
如何扩展它以便我可以打印类似的东西
print '%s %s %s' % (*lst) ?
谢谢
我正在使用impyla 0.9.0,如果我在连接中指定端口
conn = impala.dbapi.connect(host='n1', port=21000)
我会收到以下错误
Traceback (most recent call last):
File "./myquery.py", line 78, in <module>
main(len(sys.argv), sys.argv)
File "./myquery.py", line 58, in main
cur = conn.cursor()
File "/usr/lib/python2.6/site-packages/impala/dbapi/hiveserver2.py", line 55, in cursor
rpc.open_session(self.service, user, configuration))
File "/usr/lib/python2.6/site-packages/impala/_rpc/hiveserver2.py", line 132, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python2.6/site-packages/impala/_rpc/hiveserver2.py", line 214, in open_session
resp = service.OpenSession(req)
File "/usr/lib/python2.6/site-packages/impala/_thrift_gen/TCLIService/TCLIService.py", line 175, in OpenSession
return self.recv_OpenSession()
File "/usr/lib/python2.6/site-packages/impala/_thrift_gen/TCLIService/TCLIService.py", line 191, in recv_OpenSession
raise x
thrift.Thrift.TApplicationException: Invalid method name: 'OpenSession'
但它是一个有效的端口.
impala-shell -i …这是我的第一个React代码.我试图从React调用Restful Web服务.它一直说"Uncaught TypeError:this.setState不是函数".我无法弄清楚代码有什么问题.
<!DOCTYPE html>
<html>
<head>
<title>React Flux</title>
<script src="https://fb.me/react-0.13.3.js"></script>
<script src="https://fb.me/JSXTransformer-0.13.3.js"></script>
<script src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
</head>
<body>
<div id="component"></div>
<script type="text/jsx">
var JavaEEWSTest = React.createClass({
getInitialState: function () {
return {text: ''};
},
componentDidMount: function(){
$.ajax({
url: "http://localhost:8080/rest/user/456"
}).then(function(data) {
this.setState({text: data.name});
}).bind(this)
},
render: function() {
return <div>Response - {this.state.text}</div>;
}
});
React.render(<JavaEEWSTest />, document.getElementById('component'));
</script>
</body>
</html>
我正在尝试设置多节点kafka群集并具有以下三个配置文件.但是我怎么知道哪个节点是主节点？
broker.id=1
port=9093
log.dir=/data/logs/kafka/kafka-logs-1
在config/server1.properties中
broker.id=2
port=9093
log.dir=/data/logs/kafka/kafka-logs-2
在config/server2.properties中
broker.id=3
port=9093
log.dir=/data/logs/kafka/kafka-logs-3
在config/server3.properties中
野牛抱怨"冲突:1班/减少".我看不出有什么不对.请帮忙.谢谢,
%token OR AND NUMBER
%%
search_condition:
| search_condition AND search_condition { printf(" AND "); }
| '(' search_condition ')'
| predicate
;
predicate:
NUMBER { printf("%d\n", $1); }
;
在grails gsp中,而不是
<g:if env="development">
<H1> xyz </H2>
</g:if>
<g:if env="production">
<H1> xyz </H2>
</g:if>
是否可以编写逻辑或条件来组合这两个条件
例如
<g:if test="env='production'"||"env='devlopment'">
<H1> xyz </H2>
</g:if>
这样做的正确方法是什么？现在我有错误.
谢谢,
我试图用一个 build.gradle 创建两个单独的 jar 文件。
它几乎可以工作，但一个会覆盖另一个。正确的做法是什么？
jar {
//include contents of output dir
from "$buildDir/classes/main"
exclude '**/a1/**'
archiveName "X1-1.0.0.jar"
}
jar {
//include contents of output dir
from "$buildDir/classes/main"
exclude '**/a2/**'
archiveName "X2-1.0.0.jar"
}
谢谢
我知道我可以通过以MongoDB管理员身份运行db.changeUserPassword（）来更改用户密码。但是，作为没有管理员权限的用户，我可以仅使用自己的帐户更改密码吗？
谢谢，
尽管Gergo提供的解决方案有效。但是我必须创建一个新角色才能正常工作。我认为changeOwnPassword应该是内置的特权，不需要其他管理工作。在MongoDB中，仅仅为了能够更改用户自己的密码而创建专用角色是过大的。
我试图压扁一张地图.不知道为什么1)工作但2)不是.
scala> val m = Map(1->2, 2->4, 3->6)
m: scala.collection.immutable.Map[Int,Int] = Map(1 -> 2, 2 -> 4, 3 -> 6)
1)
scala> m.flatMap(e => List(e._1, e._2)
| )
res11: scala.collection.immutable.Iterable[Int] = List(1, 2, 2, 4, 3, 6)
2)
scala> m.flatMap(List(_._1,_._2))
<console>:12: error: missing parameter type for expanded function ((x$1) => x$1._1)
m.flatMap(List(_._1,_._2))
^
<
我正在编写我的hazelcast原型代码.运行阅读器时遇到以下错误.不确定我错过了什么.
SEVERE: [host1]:5701 [dev] [3.7.3] Service with name'hz:impl:cacheService' not found!
com.hazelcast.core.HazelcastException: Service with name 'hz:impl:cacheService' not found!
at com.hazelcast.spi.impl.NodeEngineImpl.getService(NodeEngineImpl.java:350)
at com.hazelcast.spi.Operation.getService(Operation.java:239)
at com.hazelcast.cache.impl.operation.PostJoinCacheOperation.run(PostJoinCacheOperation.java:44)
at com.hazelcast.internal.cluster.impl.operations.PostJoinOperation.run(PostJoinOperation.java:93)
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:181)
at com.hazelcast.spi.impl.operationexecutor.impl.OperationExecutorImpl.run(OperationExecutorImpl.java:375)
at com.hazelcast.spi.impl.operationservice.impl.OperationServiceImpl.run(OperationServiceImpl.java:267)
at com.hazelcast.spi.impl.operationservice.impl.OperationServiceImpl.runOperationOnCallingThread(OperationServiceImpl.java:262)
at com.hazelcast.internal.cluster.impl.operations.FinalizeJoinOperation.runPostJoinOp(FinalizeJoinOperation.java:139)
at com.hazelcast.internal.cluster.impl.operations.FinalizeJoinOperation.run(FinalizeJoinOperation.java:104)
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:181)
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:396)
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:117)
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.run(OperationThread.java:102)
Caused by: com.hazelcast.spi.exception.ServiceNotFoundException: Service with name 'hz:impl:cacheService' not found!
... 14 more
这是我的代码
public class Reader {
public static void main(String[] args) throws InterruptedException {
Config config = new Config();
config.getNetworkConfig().getJoin().getTcpIpConfig().addMember(“host1”).setEnabled(true);
config.getNetworkConfig().getJoin().getTcpIpConfig().addMember(“host2”).setEnabled(true);
config.getNetworkConfig().getJoin().getMulticastConfig().setEnabled(false);
HazelcastInstance hz …我想了解HazelCast Cache
我有一个分布式环境,需要在主机之间共享源数据.我正在使用HazelCast List和Map来分发数据.源数据不断变化.我可以通过HazelCast List/Map在所有主机上接收最新数据.如何在HazelCast列表/地图上使用HazelCast缓存.
根据这个,"每个map.get(k)将是一个远程操作"但遥控器在哪里？例如,我有一个节点用key -k写入IMap.另外50个节点使用map.get(k)从IMap读取.当50个节点调用map.get(k)时会发生什么.每次调用是否都来自执行写操作的节点？如果是这样,这个"远程"节点将在响应这50个呼叫时创建多少个IMap副本？它是多线程的吗？这是IMap单身人士吗？或者每个线程都会创建这样的IMap的深层副本？
hazelcast ×3
python ×2
apache-kafka ×1
bison ×1
cloudera-cdh ×1
format ×1
gradle ×1
grails ×1
gsp ×1
impala ×1
java ×1
javascript ×1
jcache ×1
list ×1
mongodb ×1
printing ×1
reactjs ×1
scala ×1
scalability ×1
yacc ×1