Hadoop单节点安装 - 格式错误 - prolog中不允许使用内容

时间：2012-02-06 23:35:23

标签： xml hadoop

我正在尝试安装hadoop单节点。

我正在关注hadoop安装说明的this文章。我需要做的一个步骤是使用命令

格式化hadoop文件系统

hduser @ dbserver：〜/ hadoop / conf $ / home / hduser / hadoop / bin / hadoop namenode -format 

hduser@dbserver:~/hadoop/conf$ /home/hduser/hadoop/bin/hadoop namenode -format
12/02/06 18:24:31 INFO namenode.NameNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = dbserver/127.0.1.1
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 0.20.203.0
STARTUP_MSG:   build = http://svn.apache.org/repos/asf/hadoop/common/branches/branch-    0.20-security-203 -r 1099333; compiled by 'oom' on Wed May  4 07:57:50 PDT 2011
 ************************************************************/
 [Fatal Error] core-site.xml:6:1: Content is not allowed in prolog.
 12/02/06 18:24:31 FATAL conf.Configuration: error parsing conf file:  org.xml.sax.SAXParseException: Content is not allowed in prolog.
 12/02/06 18:24:31 ERROR namenode.NameNode: java.lang.RuntimeException: org.xml.sax.SAXParseException: Content is not allowed in prolog.
at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1237)
at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1093)
at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1037)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:438)
at org.apache.hadoop.hdfs.server.namenode.NameNode.setStartupOption(NameNode.java:1124)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1141)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1162)
 Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog.
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:249)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:180)
at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1142)
... 6 more

    12/02/06 18:24:31 INFO namenode.NameNode: SHUTDOWN_MSG: 
    /************************************************************
      SHUTDOWN_MSG: Shutting down NameNode at dbserver/127.0.1.1
    ************************************************************/

我在尝试格式化时收到上述错误消息

欢迎任何解决此问题的建议:)。

core-site.xml文件供您参考@zensen 

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

 <!-- Put site-specific property overrides in this file. -->

  n: conf/core-site.xml -->
  <property>
  <name>hadoop.tmp.dir</name>
  <value>/app/hadoop/tmp</value>
  <description>A base for other temporary directories.</description>
  </property>

    <property>
    <name>fs.default.name</name>
    <value>hdfs://localhost:54310</value>
    <description>The name of the default file system.  A URI whose
    scheme and authority determine the FileSystem implementation.  The
    uri's scheme determines the config property (fs.SCHEME.impl) naming
     the FileSystem implementation class.  The uri's authority is used to
    determine the host, port, etc. for a filesystem.</description>
   </property><configuration>

〜

2 个答案:

答案 0 :(得分：4)

这不是真正的Hadoop问题。

org.xml.sax.SAXParseException: Content is not allowed in prolog.

表示您的XML文件不正确。更准确地说，它包含<?xml之前的一些字符。 core-site.xml之前的<?xml中是否有任何字符？如果是，则删除它们。请记住，那些可能不会在所有编辑器中显示（取决于编码）。

答案 1 :(得分：0)

错误： 

[Fatal Error] core-site.xml:1:36: Element type "xml" must be followed by either attribute specifications, ">" or "/>".
16/09/05 13:59:48 FATAL conf.Configuration: error parsing conf core-site.xml
org.xml.sax.SAXParseException; systemId: file:/home/amtex/Documents/installed/hadoop/etc/hadoop/core-site.xml; lineNumber: 1; columnNumber: 36; Element type "xml" must be followed by either attribute specifications, ">" or "/>".
    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:150)
    at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2480)
    at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2468)
    at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2539)
    at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2492)
    at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2405)
    at org.apache.hadoop.conf.Configuration.set(Configuration.java:1143)
    at org.apache.hadoop.conf.Configuration.set(Configuration.java:1115)
    at org.apache.hadoop.conf.Configuration.setBoolean(Configuration.java:1451)
    at org.apache.hadoop.util.GenericOptionsParser.processGeneralOptions(GenericOptionsParser.java:321)
    at org.apache.hadoop.util.GenericOptionsParser.parseGeneralOptions(GenericOptionsParser.java:487)
    at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:170)
    at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:153)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1422)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1559)
16/09/05 13:59:48 ERROR namenode.NameNode: Failed to start namenode.
java.lang.RuntimeException: org.xml.sax.SAXParseException; systemId: file:/home/amtex/Documents/installed/hadoop/etc/hadoop/core-site.xml; lineNumber: 1; columnNumber: 36; Element type "xml" must be followed by either attribute specifications, ">" or "/>".
    at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2645)
    at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2492)
    at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2405)
    at org.apache.hadoop.conf.Configuration.set(Configuration.java:1143)
    at org.apache.hadoop.conf.Configuration.set(Configuration.java:1115)
    at org.apache.hadoop.conf.Configuration.setBoolean(Configuration.java:1451)
    at org.apache.hadoop.util.GenericOptionsParser.processGeneralOptions(GenericOptionsParser.java:321)
    at org.apache.hadoop.util.GenericOptionsParser.parseGeneralOptions(GenericOptionsParser.java:487)
    at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:170)
    at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:153)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1422)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1559)
Caused by: org.xml.sax.SAXParseException; systemId: file:/home/amtex/Documents/installed/hadoop/etc/hadoop/core-site.xml; lineNumber: 1; columnNumber: 36; Element type "xml" must be followed by either attribute specifications, ">" or "/>".
    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:150)
    at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2480)
    at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2468)
    at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2539)
    ... 11 more
16/09/05 13:59:48 INFO util.ExitUtil: Exiting with status 1
16/09/05 13:59:48 INFO namenode.NameNode: SHUTDOWN_MSG:

检查core-site.xml中的xml语法

<强>解决方案： 

<xml version="1.0" encoding="UTF-8"?>
to 
<?xml version="1.0" encoding="UTF-8"?>
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