指定 `mapreduce.map.java.opts` 而不覆盖内存设置怎么办?

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英文:

Specifying mapreduce.map.java.opts without overriding memory settings?

问题

我正在使用一个运行 mapr 5.2 的 Hadoop 集群,存在与 Unicode 字符编码相关的问题。我发现将以下行添加到 mapred-site.xml 中可以解决这个问题:

<property>
  <name>mapreduce.map.java.opts</name>
  <value>-Dfile.encoding=utf-8</value>
</property>
<property>
  <name>mapreduce.map.java.opts</name>
  <value>-Dfile.encoding=utf-8</value>
</property>

然而,不幸的是,这会导致许多工作(在没有这些属性的情况下正常工作)抛出像这样的错误:

Container [pid=63155,containerID=container_e40_1544666751235_12271_01_000004] 超出物理内存限制。当前使用情况:已使用 8.0 GB 的 8 GB 物理内存;已使用 31.7 GB 的 16.8 GB 虚拟内存。正在终止容器。

我已经尝试将 mapreduce.map.memory.mb 的值增加到根据此错误消息所允许的最大值:

作业 job_1544666751235_12267 由于 MAP 所需的资源能力超过集群中支持的最大容器资源能力而失败。正在终止作业。mapResourceRequest: <memory:16000, vCores:1, disks:0.5> maxContainerCapability:<memory:8192, vCores:20, disks:4.0>

但容器仍然被终止。正如我所说,这些作业在设置 mapreduce.*.java.opts 属性之前工作正常,因此我认为它们正在覆盖某些内容。有没有办法在不覆盖其他 Java 参数的情况下设置 -Dfile.encoding 呢?

英文:

I am using a hadoop cluster running mapr 5.2 that has problems with unicode character encodings. I discovered that adding the following lines to mapred-site.xml solved this issue:

&lt;property&gt;
  &lt;name&gt;mapreduce.map.java.opts&lt;/name&gt;
  &lt;value&gt;-Dfile.encoding=utf-8&lt;/value&gt;
&lt;/property&gt;
&lt;property&gt;
  &lt;name&gt;mapreduce.map.java.opts&lt;/name&gt;
  &lt;value&gt;-Dfile.encoding=utf-8&lt;/value&gt;
&lt;/property&gt;

Unfortunately, this causes many jobs (that work fine without these properties) to throw errors like this:

Container [pid=63155,containerID=container_e40_1544666751235_12271_01_000004] is running beyond physical memory limits. Current usage: 8.0 GB of 8 GB physical memory used; 31.7 GB of 16.8 GB virtual memory used. Killing container.

I've tried increasing the value of mapreduce.map.memory.mb to the maximum allowed according to this error mesage:

Job job_1544666751235_12267 failed with state KILLED due to: MAP capability required is more than the supported max container capability in the cluster. Killing the Job. mapResourceRequest: &lt;memory:16000, vCores:1, disks:0.5&gt; maxContainerCapability:&lt;memory:8192, vCores:20, disks:4.0&gt;

But containers are still killed. Like I said, these jobs worked fine before setting the mapreduce.*.java.opts properties, so I assume they are overriding something. Is there a way to set -Dfile.encoding without overriding other Java parameters?

答案1

得分: 1

以下是翻译好的内容:

之前是否存在 mapreduce.*.java.opts 的值?通常像 -Xmx 这样的 Java 内存设置会放在那里。因此,仅保留 -Dfile.encoding=utf-8 可能已删除了那些设置,这可能会影响其他作业。在这里您有两个选择:

  1. 将您的编码设置追加到先前存在的值中。但是在这里,编码设置将适用于使用该 mapred-site.xml 的所有作业。
    <property>
      <name>mapreduce.map.java.opts</name>
      <value>将您先前存在的java_opts值放在这里 -Dfile.encoding=utf-8</value>
    </property>
    <property>
      <name>mapreduce.reduce.java.opts</name>
      <value>将您先前存在的java_opts值放在这里 -Dfile.encoding=utf-8</value>
    </property>
  1. 仅在运行作业时为作业设置此值,前提是您的代码中使用了 org.apache.hadoop.util.GenericOptionsParser。因此,编码设置仅适用于您的作业。
yarn jar <your_jar> <class> -Dmapreduce.map.java.opts="将您先前存在的java_opts值放在这里 -Dfile.encoding=utf-8"
英文:

Is there a value existed earlier for mapreduce.*.java.opts? Usually the Java memory settings like -Xmx etc goes in there. So just keeping -Dfile.encoding=utf-8 might have removed those settings and that might have affected other jobs. You have two options here

  1. Append your encoding settings to the earlier existed value. But here encoding setting will be applicable to all the jobs using that mapred-site.xml
    &lt;property&gt;
      &lt;name&gt;mapreduce.map.java.opts&lt;/name&gt;
      &lt;value&gt;your_earlier_existed_java_opts_value_goes_here -Dfile.encoding=utf-8&lt;/value&gt;
    &lt;/property&gt;
    &lt;property&gt;
      &lt;name&gt;mapreduce.reduce.java.opts&lt;/name&gt;
      &lt;value&gt;your_earlier_existed_java_opts_value_goes_here -Dfile.encoding=utf-8&lt;/value&gt;
    &lt;/property&gt;
  1. Set this value only to your job while running, provided you use org.apache.hadoop.util.GenericOptionsParser on your code. So encoding settings will be applicable only for your job.
yarn jar &lt;your_jar&gt; &lt;class&gt; -Dmapreduce.map.java.opts=&quot;your_earlier_existed_java_opts_value_goes_here -Dfile.encoding=utf-8&quot;

</details>



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  • 本文由 发表于 2020年10月23日 23:52:48
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