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https://issues.apache.org/jira/browse/HDDS-2199?focusedWorklogId=320538&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-320538
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ASF GitHub Bot logged work on HDDS-2199:
----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Sep/19 14:53
Start Date: 30/Sep/19 14:53
Worklog Time Spent: 10m
Work Description: sodonnel commented on pull request #1551: HDDS-2199 In
SCMNodeManager dnsToUuidMap cannot track multiple DNs on the same host
URL: https://github.com/apache/hadoop/pull/1551
Often in test clusters and tests, we start multiple datanodes on the same
host.
In SCMNodeManager.register() there is a map of hostname -> datanode UUID
called dnsToUuidMap.
If several DNs register from the same host, the entry in the map will be
overwritten and the last DN to register will 'win'.
This means that the method getNodeByAddress() does not return the correct
DatanodeDetails object when many hosts are registered from the same address.
This method is only used in SCMBlockProtocolServer.sortDatanodes() to allow
it to see if one of the nodes matches the client, but it need to be used by the
Decommission code.
Perhaps we could change the getNodeByAddress() method to returns a list of
DNs? In normal production clusters, there should only be one returned, but in
test clusters, there may be many. Any code looking for a specific DN entry
would need to iterate the list and match on the port number too, as host:port
would be the unique definition of a datanode.
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Issue Time Tracking
-------------------
Worklog Id: (was: 320538)
Remaining Estimate: 0h
Time Spent: 10m
> In SCMNodeManager dnsToUuidMap cannot track multiple DNs on the same host
> -------------------------------------------------------------------------
>
> Key: HDDS-2199
> URL: https://issues.apache.org/jira/browse/HDDS-2199
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Affects Versions: 0.5.0
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Often in test clusters and tests, we start multiple datanodes on the same
> host.
> In SCMNodeManager.register() there is a map of hostname -> datanode UUID
> called dnsToUuidMap.
> If several DNs register from the same host, the entry in the map will be
> overwritten and the last DN to register will 'win'.
> This means that the method getNodeByAddress() does not return the correct
> DatanodeDetails object when many hosts are registered from the same address.
> This method is only used in SCMBlockProtocolServer.sortDatanodes() to allow
> it to see if one of the nodes matches the client, but it need to be used by
> the Decommission code.
> Perhaps we could change the getNodeByAddress() method to returns a list of
> DNs? In normal production clusters, there should only be one returned, but in
> test clusters, there may be many. Any code looking for a specific DN entry
> would need to iterate the list and match on the port number too, as host:port
> would be the unique definition of a datanode.
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