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https://issues.apache.org/jira/browse/HDFS-11999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Elek, Marton updated HDFS-11999:
--------------------------------
    Status: Patch Available  (was: Open)

> Ozone: Clarify startup error message of Datanode in case namenode is missing
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-11999
>                 URL: https://issues.apache.org/jira/browse/HDFS-11999
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Elek, Marton
>            Assignee: Elek, Marton
>         Attachments: HDFS-11999.patch
>
>
> Datanode is failing if namenode config setting is missing even for Ozone with 
> a confusing error message:
> {code}
> 14:33:29.176 [main] ERROR o.a.h.hdfs.server.datanode.DataNode - Exception in 
> secureMain
> java.io.IOException: No services to connect (NameNodes or SCM).
>       at 
> org.apache.hadoop.hdfs.server.datanode.BlockPoolManager.refreshNamenodes(BlockPoolManager.java:168)
>  ~[classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1440)
>  [classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:510) 
> [classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2802)
>  [classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2705)
>  [classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2752)
>  [classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2896)
>  [classes/:na]
>       at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:2920) 
> [classes/:na]
> 14:33:29.177 [main] INFO  org.apache.hadoop.util.ExitUtil - Exiting with 
> status 1: java.io.IOException: No services to connect (NameNodes or SCM).
> {code}



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