[ https://issues.apache.org/jira/browse/HADOOP-7777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran updated HADOOP-7777: ----------------------------------- Target Version/s: 0.23.0, 0.24.0 (was: 0.24.0, 0.23.0) Status: Open (was: Patch Available) > Implement a base class for DNSToSwitchMapping implementations that can offer > extra topology information > ------------------------------------------------------------------------------------------------------- > > Key: HADOOP-7777 > URL: https://issues.apache.org/jira/browse/HADOOP-7777 > Project: Hadoop Common > Issue Type: Improvement > Components: util > Affects Versions: 0.23.0 > Reporter: Steve Loughran > Assignee: Steve Loughran > Attachments: HADOOP-7777-switch.patch, HADOOP-7777-switch.patch > > > HDFS-2492 has identified a need for DNSToSwitchMapping implementations to > provide a bit more topology information (e.g. whether or not there are > multiple switches). This could be done by writing an extended interface, > querying its methods if present and coming up with a default action if there > is no extended interface. > Alternatively, we have a base class that all the standard mappings implement, > with a boolean isMultiRack() method; all the standard subclasses would extend > this, as could any third party topology provider. The advantage of this > approach is that it is easier to add new operations without going into a > multi-interface mess. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira