blocks|key|2650803|text|只对那些来自谷歌的人来说|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650804|重新启动任何EMR服务|2650805|要在EMR中重新启动服务，请执行以下操作：|2650806|2650807|通过运行以下命令查找服务的名称：|ordered-list-item|2650808|2650809|initctl+list|2650810|例如，YARN资源管理器服务被命名为“hadoop-yarn-resourcemanager”。|2650811|2650812|通过运行以下命令停止服务：|2650813|2650814|sudo+stop+hadoop-yarn+resourcemanager|2650815|等待几秒钟，然后通过运行以下命令启动该服务：|unordered-list-item|2650816|2650817|sudo启动hadoop-yarn-resourcemanager|2650818|注意:需要Stop/start；请勿使用restart命令。|2650819|2650820|通过运行以下命令验证进程是否正在运行：|2650821|2650822|sudo+status+hadoop-yarn-resourcemanager+|2650823|使用ps检查进程，然后在日志目录/var/+log+/中检查日志文件中的任何错误。|2650824|来源：https://aws.amazon.com/premiumsupport/knowledge-center/restart-service-emr/|offset|length|2650825|entityMap|0|LINK|mutability|MUTABLE|url|https://aws.amazon.com/premiumsupport/knowledge-center/restart-service-emr/^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|3|23|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1O|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|1Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1S|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1T|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|P|3|Q|5|I|7|1V|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1X|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|1Y|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|20|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|21|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|22|8|@]|9|@]|A|$]]|$1|13|3|14|5|I|7|23|8|@]|9|@]|A|$]]|$1|15|3|-4|5|6|7|24|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|25|8|@]|9|@]|A|$]]|$1|18|3|19|5|6|7|26|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|6|7|27|8|@]|9|@$1C|28|1D|29|1|2A]]|A|$]]|$1|1E|3|-4|5|6|7|2B|8|@]|9|@]|A|$]]]|1F|$1G|$5|1H|1I|1J|A|$1K|1L]]]]

Just for those who are gonna come from Google

To restart any EMR service 

In order to restart a service in EMR, perform the following actions:

<ol>
<li>Find the name of the service by running the following command:

initctl list</li>
</ol>

For example, the YARN Resource Manager service is named “hadoop-yarn-resourcemanager”.

<ol start="2">
<li>Stop the service by running the following command:

sudo stop hadoop-yarn-resourcemanager </li>
<li>Wait a few seconds, then start the service by running the following command:

sudo start hadoop-yarn-resourcemanager</li>
</ol>

Note: Stop/start is required; do not use the restart command.

<ol start="4">
<li>Verify that the process is running by running the following command:

sudo status hadoop-yarn-resourcemanager </li>
</ol>

Check for the process using ps, and then check the log file for any errors in the log directory /var/log/.

Source : <a href="https://aws.amazon.com/premiumsupport/knowledge-center/restart-service-emr/" rel="noreferrer">https://aws.amazon.com/premiumsupport/knowledge-center/restart-service-emr/</a>

blocks|key|35584|text|+sudo+stop+hive-metastore
+sudo+start+hive-metastore|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|35585|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> sudo stop hive-metastore
 sudo start hive-metastore
</code></pre>

blocks|key|2650841|text|在EMR+5.x上，我发现这是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650842|hive+--service+metastore+--stop|offset|length|style|CODE|2650843|hive+--service+metastore+--start|2650844|entityMap^0|0|0|V|0|0|W|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

On EMR 5.x I have found this to work:

<code>hive --service metastore --stop</code>

<code>hive --service metastore --start</code>

blocks|key|1941180|text|对我来说，这种方法奏效了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1941181|1941182|获取pid|ordered-list-item|1941183|Kill+|1941184|1941185|+by+|1941186|1941187|1和2的命令：|1941188|ps+aux+%7C+grep+MetaStore
sudo+-u+hive+kill+<pid+from+above>|code-block|syntax|javascript|1941189|在这里，如果您不熟悉ps，可以使用以下命令，该命令将显示PID的标头和hive+Metastore命令的一行：|offset|length|style|CODE|1941190|ps+aux+%7C+egrep+"MetaStore%7CPID"+%7C+grep+-v+grep|1941191|配置单元服务器自行重新启动。通过ps再次验证猪可能会发生变化。|1941192|ps+aux+%7C+grep+MetaStore|1941193|entityMap^0|0|0|0|0|0|0|0|0|0|A|2|S|3|0|0|G|2|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|18|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|19|8|@]|9|@]|A|$]]|$1|H|3|-4|5|E|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|E|7|1B|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1D|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1E|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1F|8|@$U|1G|V|1H|W|X]|$U|1I|V|1J|W|X]]|9|@]|A|$]]|$1|Y|3|Z|5|P|7|1K|8|@]|9|@]|A|$Q|R]]|$1|10|3|11|5|6|7|1L|8|@$U|1M|V|1N|W|X]]|9|@]|A|$]]|$1|12|3|13|5|P|7|1O|8|@]|9|@]|A|$Q|R]]|$1|14|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|15|$]]

For me this approach worked:

<ol>
<li>Get the pid</li>
<li>Kill the process</li>
<li>Process restarts by itself</li>
</ol>

Commands for 1 &amp; 2:

<pre><code>ps aux | grep MetaStore
sudo -u hive kill &lt;pid from above&gt;
</code></pre>

Here if you are not familiar with <code>ps</code> you can use the following command which will show the headers for <code>PID</code> and only one line of the hive Metastore command:

<pre><code>ps aux | egrep "MetaStore|PID" | grep -v grep
</code></pre>

Hive Server restarted by itself. Validate again by <code>ps</code> the pig would have changed.

<pre><code>ps aux | grep MetaStore
</code></pre>

blocks|key|34735|text|您不必重新启动整个集群。在启动集群时，可以指定一个包含RDS详细信息的hive-site.xml文件。如果您没有遵循此选项并在启动群集后手动进行更改，则不需要重新启动整个群集。只需单独重新启动hive-metastore服务。配置单元元存储区仅在主节点上运行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34736|您可以通过多种方式启动集群。|34737|1)+AWS控制台2)使用API+(Java、Python等)+3)使用AWS+cli|34738|您可以将hive-site.xml保存在S3中，并在启动集群时作为引导步骤执行此活动。AWS+api提供了从S3指定自定义hive-site.xml的特性，而不是默认创建的特性。|34739|如果您仅从主计算机使用hive，则不必在所有计算机中进行更改。|34740|下面给出了使用aws+cli启动EMR时指定hive-site.xml的示例|34741|aws+emr+create-cluster+--name+"Test+cluster"+--ami-version+3.3+--applications+Name=Hue+Name=Hive+Name=Pig+\
--use-default-roles+--ec2-attributes+KeyName=myKey+\
--instance-type+m3.xlarge+--instance-count+3+\
--bootstrap-actions+Name="Install+Hive+Site+Configuration",Path="s3://elasticmapreduce/libs/hive/hive-script",\
Args=["--base-path","s3://elasticmapreduce/libs/hive","--install-hive-site","--hive-site=s3://mybucket/hive-site.xml","--hive-versions","latest"]|code-block|syntax|javascript|34742|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|X|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|Y|8|@]|9|@]|A|$O|P]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

You don't have to restart the entire cluster. While launching the cluster, you can specify a hive-site.xml file with the details of RDS. If you are not following this option and making the changes manually after launching the cluster, you don't need to restart the entire cluster. Just restart the hive-metastore service alone. Hive metastore is running in the master node only

You can launch the cluster either by using multiple ways.

1) AWS console
2) Using API (Java, Python etc)
3) Using AWS cli

You can keep the hive-site.xml in S3 and perform this activity as a bootstrap step while launching the cluster. AWS api is providing the feature to specify custom hive-site.xml from S3 rather than the one created by default.

If you are using hive from the master machine alone, you don't have to make the changes in all the machines.

An example of specifying the hive-site.xml while launching EMR using aws cli is given below

<pre><code>aws emr create-cluster --name "Test cluster" --ami-version 3.3 --applications Name=Hue Name=Hive Name=Pig \
--use-default-roles --ec2-attributes KeyName=myKey \
--instance-type m3.xlarge --instance-count 3 \
--bootstrap-actions Name="Install Hive Site Configuration",Path="s3://elasticmapreduce/libs/hive/hive-script",\
Args=["--base-path","s3://elasticmapreduce/libs/hive","--install-hive-site","--hive-site=s3://mybucket/hive-site.xml","--hive-versions","latest"]
</code></pre>

I am very new to HIVE as well AWS-EMR. As per my requirement, i need to create Hive Metastore Outside the Cluster (from AWS EMR to AWS RDS). 
I followed the instruction given in 

<a href="http://docs.aws.amazon.com/ElasticMapReduce/latest/DeveloperGuide/emr-dev-create-metastore-outside.html" rel="noreferrer">http://docs.aws.amazon.com/ElasticMapReduce/latest/DeveloperGuide/emr-dev-create-metastore-outside.html</a>

I made changes in hive-site.xml and able to setup hive metaStore to Amazon RDS mysql server. To bring the changes in action, currently i am rebooting the complete cluster so hive start storing metastore to AWS-RDS. This way it is working.

But i want to avoid rebooting the cluster, is there any way i can restart the service?

Restart hive service on AWS EMR

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我对HIVE以及AWS-EMR都很陌生。根据我的要求，我需要在群集外部创建配置单元元存储(从AWS EMR到AWS RDS)。我听从了“我在hive-site.xml中进行了更改，并能够将hive metaStore设置为Amazon RDS mysql服务器。为了使更改生效，目前我正在重启整个集群，以便hive开始将元数据存储到AWS-RDS。这就是它的工作方式。但是我想避免重启集群，有什么方法

问在AWS EMR上重新启动配置单元服务
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