CQLSSTableWriter抛出UnknownHost RuntimeException

Question

我试图按照Cassandra blog中给出的简单示例使用CQLSSTableWriter。

我的项目依赖关系：

compile 'org.codehaus.groovy:groovy-all:2.3.11' 
compile 'com.datastax.cassandra:cassandra-driver-core:2.1.9' 
compile 'org.apache.cassandra:cassandra-all:2.2.4' 

testCompile group: 'junit', name: 'junit', version: '4.11' 

这里是我的代码：

Application.groovy

package com.example 

import org.apache.cassandra.io.sstable.CQLSSTableWriter 

class Application { 


    public static void main(String[] args) { 

     def schema = """create table example.new_table (
      name ascii, 
      value ascii 
      PRIMARY KEY (name));""" 

     def insert = """INSERT INTO example.new_table 
         (name, value) 
         VALUES (?, ?)""" 

     def outputDir = "/Users/me/datadump" 

     def writer = CQLSSTableWriter.builder() 
       .inDirectory(outputDir) 
       .forTable(schema) 
       .using(insert) 
       .build() 


     writer.close() 
    } 
} 

该代码产生以下异常：

Exception in thread "main" java.lang.ExceptionInInitializerError 
    at org.apache.cassandra.cql3.QueryProcessor.getStatement(QueryProcessor.java:491) 
    at org.apache.cassandra.io.sstable.CQLSSTableWriter$Builder.getStatement(CQLSSTableWriter.java:514) 
    at org.apache.cassandra.io.sstable.CQLSSTableWriter$Builder.forTable(CQLSSTableWriter.java:361) 
    at org.apache.cassandra.io.sstable.CQLSSTableWriter$Builder$forTable$0.call(Unknown Source) 
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45) 
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108) 
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116) 
    at com.example.Application.main(Application.groovy:24) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) 
Caused by: java.lang.RuntimeException: java.net.UnknownHostException: COMP: COMP: nodename nor servname provided, or not known 
    at org.apache.cassandra.utils.FBUtilities.getLocalAddress(FBUtilities.java:136) 
    at org.apache.cassandra.tracing.Tracing.<init>(Tracing.java:81) 
    at org.apache.cassandra.tracing.Tracing.<clinit>(Tracing.java:87) 
    ... 13 more 
Caused by: java.net.UnknownHostException: COMP: COMP: nodename nor servname provided, or not known 
    at java.net.InetAddress.getLocalHost(InetAddress.java:1475) 
    at org.apache.cassandra.utils.FBUtilities.getLocalAddress(FBUtilities.java:131) 
    ... 15 more 
Caused by: java.net.UnknownHostException: COMP: nodename nor servname provided, or not known 
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) 
    at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901) 
    at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1295) 
    at java.net.InetAddress.getLocalHost(InetAddress.java:1471) 
    ... 16 more 

Process finished with exit code 1 

所有使用CQLSSTableWriter的例子看起来都非常像我的代码。我的版本与我的依赖有冲突吗？我在想也许是因为例外是告诉我它甚至无法加载Tracing类。

Answer 1

按照这里找到的建议https://stackoverflow.com/a/1881967/953327解决了眼前的问题。

我需要为我的/etc/hosts文件添加一个条目。