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https://issues.apache.org/jira/browse/HDFS-10208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ming Ma updated HDFS-10208:
---------------------------
Description:
If DFSClient runs on a machine that can't resolve network path,
{{DNSToSwitchMapping}} will return {{DEFAULT_RACK}}. In addition, if somehow
{{dnsToSwitchMapping.resolve}} returns null, that will cause exception when it
tries to create {{clientNode}}. In either case, there is no need to create
{{clientNode}} and we should treat its network distance with any datanode as
Integer.MAX_VALUE.
{noformat}
clientNode = new NodeBase(clientHostName,
dnsToSwitchMapping.resolve(nodes).get(0));
{noformat}
was:
If DFSClient runs on a machine that can't resolve network path,
e.g.{{dnsToSwitchMapping.resolve}} returns null, that will cause exception when
it tries to create {{clientNode}}. In such case, there is no need to create
{{clientNode}} as null {{clientNode}} means its network distance with any
datanode is Integer.MAX_VALUE, which is what we want.
{noformat}
clientNode = new NodeBase(clientHostName,
dnsToSwitchMapping.resolve(nodes).get(0));
{noformat}
> Addendum for HDFS-9579: to handle the case when client machine can't resolve
> network path
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-10208
> URL: https://issues.apache.org/jira/browse/HDFS-10208
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HDFS-10208-2.patch, HDFS-10208-3.patch,
> HDFS-10208-4.patch, HDFS-10208.patch
>
>
> If DFSClient runs on a machine that can't resolve network path,
> {{DNSToSwitchMapping}} will return {{DEFAULT_RACK}}. In addition, if somehow
> {{dnsToSwitchMapping.resolve}} returns null, that will cause exception when
> it tries to create {{clientNode}}. In either case, there is no need to create
> {{clientNode}} and we should treat its network distance with any datanode as
> Integer.MAX_VALUE.
> {noformat}
> clientNode = new NodeBase(clientHostName,
> dnsToSwitchMapping.resolve(nodes).get(0));
> {noformat}
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