[jira] [Created] (HDFS-6001) In HDFS HA setup, FileSystem.getUri returns hdfs://

["Jerry He (JIRA)" <ji...@apache.org>]

Jerry He created HDFS-6001:
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             Summary: In HDFS HA setup, FileSystem.getUri returns hdfs://<dfs.nameservices>
                 Key: HDFS-6001
                 URL: https://issues.apache.org/jira/browse/HDFS-6001
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha
    Affects Versions: 2.2.0
            Reporter: Jerry He
            Priority: Minor


When hdfs is set up with HA enable, FileSystem.getUri returns hdfs://<the-value-of-dfs.nameservices>
Here dfs.nameservices is defined when HA is enabled. In documentation:
{quote}
dfs.nameservices - the logical name for this new nameserviceChoose a logical name for this nameservice, for example "mycluster", and use this logical name for the value of this config option. The name you choose is arbitrary. It will be used both for configuration and as the authority component of absolute HDFS paths in the cluster.
Note: If you are also using HDFS Federation, this configuration setting should also include the list of other nameservices, HA or otherwise, as a comma-separated list.
<property>
  <name>dfs.nameservices</name>
  <value>mycluster</value>
</property>
{quote}
This is probably ok or even intended.  But a caller may further process the URI, for example, call URI.getHost(). This will return the 'mycluster', which is not a valid host anywhere.



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