macos OSX 上的 Hadoop“无法从 SCDynamicStore 加载领域信息”
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原文地址: http://stackoverflow.com/questions/7134723/
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Hadoop on OSX "Unable to load realm info from SCDynamicStore"
提问by Travis Nelson
I am getting this error on startup of Hadoop on OSX 10.7:
在 OSX 10.7 上启动 Hadoop 时出现此错误：
Unable to load realm info from SCDynamicStore put: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /user/travis/input/conf. Name node is in safe mode.
无法从 SCDynamicStore put 加载领域信息：org.apache.hadoop.hdfs.server.namenode.SafeModeException：无法创建目录 /user/travis/input/conf。名称节点处于安全模式。
It doesn't appear to be causing any issues with the functionality of Hadoop.
它似乎不会导致 Hadoop 的功能出现任何问题。
回答by Jeromy Carriere
Matthew Buckett's suggestion in HADOOP-7489 worked for me. Add the following to your hadoop-env.sh file:
Matthew Buckett 在 HADOOP-7489 中的建议对我有用。将以下内容添加到您的 hadoop-env.sh 文件中：
export HADOOP_OPTS="-Djava.security.krb5.realm=OX.AC.UK -Djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk"
回答by mdaniel
As an update to this (and to address David Williams' point about Java 1.7), I experienced that only setting the .realmand .kdcproperties was insufficient to stop the offending message.
作为对此的更新（并解决David Williams关于 Java 1.7 的观点），我发现仅设置.realm和.kdc属性不足以阻止违规消息。
However, by examining the source filethat is omitting the message I was able to determine that setting the .krb5.confproperty to /dev/nullwas enough to suppress the message. Obviously if you actually have a krb5 configuration, better to specify the actual path to it.
但是，通过检查省略消息的源文件，我能够确定将.krb5.conf属性设置/dev/null为足以抑制消息。显然，如果您确实有 krb5 配置，最好指定它的实际路径。
In total, my hadoop-env.shsnippet is as follows:
总的来说，我的hadoop-env.sh片段如下：
HADOOP_OPTS="${HADOOP_OPTS} -Djava.security.krb5.realm= -Djava.security.krb5.kdc="
HADOOP_OPTS="${HADOOP_OPTS} -Djava.security.krb5.conf=/dev/null"
回答by user411279
I'm having the same issue on OS X 10.8.2, Java version 1.7.0_21. Unfortunately, the above solution does not fix the problem with this version :(
我在 OS X 10.8.2，Java 版本 1.7.0_21 上遇到了同样的问题。不幸的是，上述解决方案并没有解决这个版本的问题:(
Edit:I found the solution to this, based on a hint I saw here. In the hadoop-env.shfile, change the JAVA_HOMEsetting to:
编辑：根据我在此处看到的提示，我找到了解决方案。在hadoop-env.sh文件中，将JAVA_HOME设置更改为：
export JAVA_HOME=`/usr/libexec/java_home -v 1.6`
(Note the grave quotes here.)
（注意这里的严重引用。）
回答by btiernay
FYI, you can simplify this further by only specifying the following:
仅供参考，您可以通过仅指定以下内容来进一步简化：
export HADOOP_OPTS="-Djava.security.krb5.realm= -Djava.security.krb5.kdc="
This is mentioned in HADOOP-7489 as well.
HADOOP-7489 中也提到了这一点。
回答by Vladimir Kroz
I had similar problem on MacOS and after trying different combinations this is what worked for me universally (both Hadoop 1.2 and 2.2):
我在 MacOS 上遇到了类似的问题，在尝试了不同的组合后，这对我来说普遍适用（Hadoop 1.2 和 2.2）：
in $HADOOP_HOME/conf/hadoop-env.shset the following lines:
在$HADOOP_HOME/conf/hadoop-env.sh设置以下几行：
# Set Hadoop-specific environment variables here.
export HADOOP_OPTS="-Djava.security.krb5.realm= -Djava.security.krb5.kdc="
# The java implementation to use.
export JAVA_HOME=`/usr/libexec/java_home -v 1.6`
Hope this will help
希望这会有所帮助
回答by KaKa
and also add
并添加
YARN_OPTS="$YARN_OPTS -Djava.security.krb5.realm=OX.AC.UK -Djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk"
YARN_OPTS="$YARN_OPTS -Djava.security.krb5.realm=OX.AC.UK -Djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk"
before executing start-yarn.sh (or start-all.sh) on cdh4.1.3
在 cdh4.1.3 上执行 start-yarn.sh（或 start-all.sh）之前
回答by JnBrymn
I had this error when debugging MapReduce from Eclipse, but it was a red herring. The real problem was that I should have been remote debugging by adding debugging parameters to the JAVA_OPTS
我在从 Eclipse 调试 MapReduce 时遇到了这个错误，但这是一个红鲱鱼。真正的问题是我应该通过向 JAVA_OPTS 添加调试参数来进行远程调试
-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=1044
And then creating a new "Remote Java Application" profile in the debug configuration that pointed to port 1044.
然后在指向端口 1044 的调试配置中创建一个新的“远程 Java 应用程序”配置文件。
This articlehas some more in-depth information about the debugging side of things. It's talking about Solr, but works much the same with Hadoop. If you have trouble, stick a message below and I'll try to help.
这篇文章有一些关于调试方面的更深入的信息。它在谈论 Solr，但与 Hadoop 的工作原理大致相同。如果您遇到问题，请在下方留言，我会尽力提供帮助。
