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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4521) invalid network toploogies should not be cached
Date Wed, 19 Jun 2013 11:17:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13687885#comment-13687885

Junping Du commented on HDFS-4521:

Attach a patch for branch-1 and the major differences are:
No changes on TableMapping as it is not existed in branch-1, also related tests, like TestSwitchMapping,
TestTableMapping, etc.
The changes previously on DataNodeManager now is backport to FSNameSystem.
Some special changes in MiniDFSCluster, include:
 - handle exception thrown in registering DN to NN caused by fault topology
 - adjust the sequence of dataNodes.add(...) and DataNode.runDatanodeDaemon(...) in startDataNodes()
to make sure failed node is tracked by MiniDFSCluster but just failed to started which consist
with later restart DN logic
 - update shouldWait() method to take care DN registeration failed case.
Colin and ATM, would you help to review it? Chuan, it is great if you can help to verify if
this patch fix the problem you met in branch-1. Thanks!
> 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: 2.1.0-beta, 1.3.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>             Fix For: 2.1.0-beta
>         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
> 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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