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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4521) invalid network toploogies should not be cached
Date Fri, 15 Mar 2013 06:32:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603186#comment-13603186
] 

Junping Du commented on HDFS-4521:
----------------------------------

For 3. YARN now doesn't cached register nodes into a NetworkTopology tree but resolve into
each RMNode by call RackResolver.resolve() through NM registration. Thus, it should be different
way to tell a topology is invalid or not to YARN (as no peer nodes to reference), but it is
also necessary.
For 4. to test it on an actual cluster may be just simply to use CLI of "dfsadmin -report"?
Also, I remember it used to have "dfsadmin -printTopology" but cannot find it there now. Do
you know where it is going or am I missing something?
                
> invalid network toploogies should not be cached
> -----------------------------------------------
>
>                 Key: HDFS-4521
>                 URL: https://issues.apache.org/jira/browse/HDFS-4521
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.5-beta
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HDFS-4521.001.patch, HDFS-4521.002.patch, HDFS-4521.005.patch, HDFS-4521.006.patch
>
>
> When the network topology is invalid, the DataNode refuses to start with a message such
as this:
> {quote}
> org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol.registerDatanode from 172.29.122.23:55886:
error:
> org.apache.hadoop.net.NetworkTopology$InvalidTopologyException: Invalid network topology.
You cannot have a rack and a non-rack node at the same level of the network topology.
> {quote}
> This is expected if you specify a topology file or script which puts leaf nodes at two
different depths.  However, one problem we have now is that this incorrect topology is cached
forever.  Once the NameNode sees it, this DataNode can never be added to the cluster, since
this exception will be rethrown each time.  The NameNode will not check to see if the topology
file or script has changed.  We should clear the topology mappings when there is an InvalidTopologyException,
to prevent this problem.

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