EMR集群上capacity scheduler的ACL實現

背景

前麵一篇介紹了yarn的capacity scheduler原理，實驗了在EMR集群上使用capacity scheduler對集群資源的隔離和quota的限製。本文會介紹EMR集群上capacity scheduler的ACL實現。

為什麼要做這個？前麵給集群分配的資源分配了多個隊列，以及每個隊列的資源配比和作業調度的優先級。如果多租戶裏麵的每個都按照約定，各自往自己對應的隊列裏麵提交作業，自然沒有問題。但是如果用戶熟悉capacity scheduler的操作和原理，也是可以占用別組的資源隊列。所有有了capacity scheduler的ACL設置。

關鍵參數

yarn.scheduler.capacity.queue-mappings
- 指定用戶和queue的映射關係。默認用戶上來，不用指定queue參數就能直接到對應的queue。這個比較方便，參數的格式為：[u|g]:[name]:[queue_name][,next mapping]*
yarn.scheduler.capacity.root.{queue-path}.acl_administer_queue
- 指定誰能管理這個隊列裏麵的job，英文解釋為The ACL of who can administer jobs on the default queue. 星號*表示all，一個空格表示none；
yarn.scheduler.capacity.root.{queue-path}.acl_submit_applications
- 指定誰能提交job到這個隊列，英文解釋是The ACL of who can administer jobs on the queue.星號*表示all，一個空格表示none；

EMR集群上具體操作步驟

創建EMR集群
修改相關配置來支持queue acl
- yarn-site: yarn.acl.enable=true
- mapred-site: mapreduce.cluster.acls.enabled=true
- hdfs-site: dfs.permissions.enabled=true這個跟capacity scheduler queue的acl沒什麼關係，是控製hdfs acl的，這裏一並設置了
- hdfs-site: mapreduce.job.acl-view-job=* 如果配置了dfs.permissions.enabled=true，就需要配置一下這個，要不然在hadoop ui上麵沒發查看job信息
重啟yarn和hdfs，使配置生效(root賬戶)
- su -l hdfs -c '/usr/lib/hadoop-current/sbin/stop-dfs.sh'
- su -l hadoop -c '/usr/lib/hadoop-current/sbin/stop-yarn.sh'
- su -l hdfs -c '/usr/lib/hadoop-current/sbin/start-dfs.sh'
- su -l hadoop -c '/usr/lib/hadoop-current/sbin/start-yarn.sh'
- su -l hadoop -c '/usr/lib/hadoop-current/sbin/yarn-daemon.sh start proxyserver'
修改capacity scheduler配置
完整配置

<configuration>
  <property>
    <name>yarn.scheduler.capacity.maximum-applications</name>
    <value>10000</value>
    <description>
      Maximum number of applications that can be pending and running.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.maximum-am-resource-percent</name>
    <value>0.25</value>
    <description>
      Maximum percent of resources in the cluster which can be used to run
      application masters i.e. controls number of concurrent running
      applications.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.resource-calculator</name>
    <value>org.apache.hadoop.yarn.util.resource.DefaultResourceCalculator</value>
    <description>
      The ResourceCalculator implementation to be used to compare
      Resources in the scheduler.
      The default i.e. DefaultResourceCalculator only uses Memory while
      DominantResourceCalculator uses dominant-resource to compare
      multi-dimensional resources such as Memory, CPU etc.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.queues</name>
    <value>a,b,default</value>
    <description>
      The queues at the this level (root is the root queue).
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.default.capacity</name>
    <value>20</value>
    <description>Default queue target capacity.</description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.a.capacity</name>
    <value>30</value>
    <description>Default queue target capacity.</description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.b.capacity</name>
    <value>50</value>
    <description>Default queue target capacity.</description>
  </property>


  <property>
    <name>yarn.scheduler.capacity.root.default.user-limit-factor</name>
    <value>1</value>
    <description>
      Default queue user limit a percentage from 0.0 to 1.0.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.default.maximum-capacity</name>
    <value>100</value>
    <description>
      The maximum capacity of the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.default.state</name>
    <value>RUNNING</value>
    <description>
      The state of the default queue. State can be one of RUNNING or STOPPED.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.a.state</name>
    <value>RUNNING</value>
    <description>
      The state of the default queue. State can be one of RUNNING or STOPPED.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.b.state</name>
    <value>RUNNING</value>
    <description>
      The state of the default queue. State can be one of RUNNING or STOPPED.
    </description>
  </property>


  <property>
    <name>yarn.scheduler.capacity.root.acl_submit_applications</name>
     <value> </value>
     <description>
       The ACL of who can submit jobs to the root queue.
     </description>
   </property>

  <property>
    <name>yarn.scheduler.capacity.root.a.acl_submit_applications</name>
    <value>root</value>
    <description>
      The ACL of who can submit jobs to the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.b.acl_submit_applications</name>
    <value>hadoop</value>
    <description>
      The ACL of who can submit jobs to the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.default.acl_submit_applications</name>
    <value>root</value>
    <description>
      The ACL of who can submit jobs to the default queue.
    </description>
  </property>

<property>
    <name>yarn.scheduler.capacity.root.acl_administer_queue</name>
    <value> </value>
    <description>
      The ACL of who can administer jobs on the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.default.acl_administer_queue</name>
    <value>root</value>
    <description>
      The ACL of who can administer jobs on the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.a.acl_administer_queue</name>
    <value>root</value>
    <description>
      The ACL of who can administer jobs on the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.root.b.acl_administer_queue</name>
    <value>root</value>
    <description>
      The ACL of who can administer jobs on the default queue.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.node-locality-delay</name>
    <value>40</value>
    <description>
      Number of missed scheduling opportunities after which the CapacityScheduler
      attempts to schedule rack-local containers.
      Typically this should be set to number of nodes in the cluster, By default is setting
      approximately number of nodes in one rack which is 40.
    </description>
  </property>

  <property>
    <name>yarn.scheduler.capacity.queue-mappings</name>
    <value>u:hadoop:b,u:root:a</value>
  </property>

  <property>
    <name>yarn.scheduler.capacity.queue-mappings-override.enable</name>
    <value>false</value>
    <description>
      If a queue mapping is present, will it override the value specified
      by the user? This can be used by administrators to place jobs in queues
      that are different than the one specified by the user.
      The default is false.
    </description>
  </property>

</configuration>

上麵的配置，分配了三個隊列和對應的資源配比，設置用戶hadoop默認（不指定隊列的時候）往b隊列提，root默認往a隊列提。同時hadoop隻能往b隊列提交作業，root可以往所有隊列提交作業。其它用戶沒有權限提交作業。

踩過的坑

acl_administer_queue的配置
- 配置中支持兩種操作的acl權限配置acl_administer_queue和acl_submit_applications。按照語意，如果要控製是否能提交作業，隻要配置隊列的acl_submit_applications屬性即可，按照文檔，也就是這個意思。但是其實不是的，隻要有administer權限的，就能提交作業。這個問題查了好久，找源碼才找到。

  @Override
  public void submitApplication(ApplicationId applicationId, String userName,
      String queue)  throws AccessControlException {
    // Careful! Locking order is important!

    // Check queue ACLs
    UserGroupInformation userUgi = UserGroupInformation.createRemoteUser(userName);
    if (!hasAccess(QueueACL.SUBMIT_APPLICATIONS, userUgi)
        && !hasAccess(QueueACL.ADMINISTER_QUEUE, userUgi)) {
      throw new AccessControlException("User " + userName + " cannot submit" +
          " applications to queue " + getQueuePath());
    }

root queue的配置
- 如果要限製用戶對queue的權限root queue一定要設置，不能隻設置leaf queue。因為權限是根權限具有更高的優先級，看代碼注釋說:// recursively look up the queue to see if parent queue has the permission。這個跟常人理解也不一樣。所以需要先把把的權限限製住，要不然配置的各種自隊列的權限根本沒有用。

<property>
    <name>yarn.scheduler.capacity.root.acl_submit_applications</name>
     <value> </value>
     <description>
       The ACL of who can submit jobs to the root queue.
     </description>
   </property>

最後更新：2017-05-13 08:44:16

EMR集群上capacity scheduler的ACL實現

背景

關鍵參數

EMR集群上具體操作步驟

踩過的坑

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EMR集群上capacity scheduler的ACL實現

背景

關鍵參數

EMR集群上具體操作步驟

踩過的坑

上一篇： 阿裏雲服務器價格表，阿裏雲服務器多少錢

下一篇： 5月12日雲棲精選夜讀：阿裏雲將增設馬來西亞數據中心 納吉布總理大讚中國技術

相關內容

熱門內容

最新內容

上一篇：阿裏雲服務器價格表，阿裏雲服務器多少錢

下一篇： 5月12日雲棲精選夜讀：阿裏雲將增設馬來西亞數據中心納吉布總理大讚中國技術