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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4521) invalid network topologies should not be cached
Date Sun, 15 Sep 2013 03:55:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767677#comment-13767677
] 

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

A minor optimization here is cleanup cache only on specific nodes. Filed HDFS-5208 with a
patch, [~cmccabe], would you help to take a look at it? 
                
> invalid network topologies should not be cached
> -----------------------------------------------
>
>                 Key: HDFS-4521
>                 URL: https://issues.apache.org/jira/browse/HDFS-4521
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.1.0-beta, 1.3.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>             Fix For: 2.1.0-beta, 1.3.0
>
>         Attachments: HDFS-4521.001.patch, HDFS-4521.002.patch, HDFS-4521.005.patch, HDFS-4521.006.patch,
HDFS-4521.008.patch, HDFS-4521-branch1.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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