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https://issues.apache.org/jira/browse/HDFS-13795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573429#comment-16573429
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Íñigo Goiri commented on HDFS-13795:
------------------------------------
The error in {{TestInMemoryLevelDBAliasMapClient}} seems related.
> Fix potential NPE in InMemoryLevelDBAliasMapServer
> --------------------------------------------------
>
> Key: HDFS-13795
> URL: https://issues.apache.org/jira/browse/HDFS-13795
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
> Priority: Major
> Attachments: HDFS-13795.001.patch, HDFS-13795.002.patch,
> HDFS-13795.003.patch
>
>
> Namenode fails to stop correctly due to NPE in InMemoryAliasMapServer, when
> it is configured incorrectly.
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.aliasmap.InMemoryLevelDBAliasMapServer.close(InMemoryLevelDBAliasMapServer.java:149)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.stop(NameNode.java:1023)
> {code}
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