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Posted to common-dev@hadoop.apache.org by "Chao Sun (Jira)" <ji...@apache.org> on 2020/11/11 07:14:00 UTC
[jira] [Resolved] (HADOOP-17327) NPE when starting MiniYARNCluster
from hadoop-client-minicluster
[ https://issues.apache.org/jira/browse/HADOOP-17327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chao Sun resolved HADOOP-17327.
-------------------------------
Resolution: Fixed
> NPE when starting MiniYARNCluster from hadoop-client-minicluster
> ----------------------------------------------------------------
>
> Key: HADOOP-17327
> URL: https://issues.apache.org/jira/browse/HADOOP-17327
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.3.0
> Reporter: Chao Sun
> Priority: Critical
>
> When starting MiniYARNCluster one could get the following exception:
> {code}
> java.lang.NullPointerException:
> at org.apache.hadoop.yarn.server.nodemanager.webapp.WebServer.serviceStart(WebServer.java:72)
> at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:122)
> at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at org.apache.hadoop.yarn.server.MiniYARNCluster$NodeManagerWrapper.serviceStart(MiniYARNCluster.java:616)
> at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:122)
> at org.apache.hadoop.yarn.server.MiniYARNCluster.serviceStart(MiniYARNCluster.java:327)
> at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at org.apache.spark.deploy.yarn.BaseYarnClusterSuite.beforeAll(BaseYarnClusterSuite.scala:96)
> ...
> {code}
> Looking into the code, this is because we explicitly exclude resource files under {{hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/resources/TERMINAL}}, and therefore this code in {{WebServer}} fails with NPE:
> {code}
> terminalParams.put("resourceBase", WebServer.class
> .getClassLoader().getResource("TERMINAL").toExternalForm());
> {code}
> Those who use {{hadoop-minicluster}} may not be affected because they'll also need {{hadoop-yarn-server-nodemanager}} as an extra dependency, which includes the resource files. On the other hand {{hadoop-client-minicluster}} packages both test classes (e.g., {{MiniYARNCluster}}) as well as main classes (e.g., {{ResourceManager}} and {{NodeManager}}) into a single shaded jar. It should include these resource files for testing as well. Otherwise, {{MiniYARNCluster}} is unusable.
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