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https://issues.apache.org/jira/browse/HDFS-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhouyingchao updated HDFS-11573:
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Description:
Federated file system can improve overall scalability by dividing a
single namespace into multiple sub-namespaces. Since the divided sub-namespace
are held by different namenodes, rename operation between those sub-namespace
is forbidden. Due to this restriction, many applications have to be rewritten
to work around the issue after migrated to federated file system. Supporting
rename between different namenodes would make it much easier to migrate to
federated file systems.
We have finished a preliminary implementation of this feature in a 2.6
branch. I'll upload a write-up regarding the design in a few days. And then
I'll re-org the code against the trunk and upload the patch.
was:
Federated file system can improve overall scalability by dividing a
single namespace into multiple sub-namespaces. Since the divided sub-namespace
is held by different namenodes, rename operation between those sub-namespace is
forbidden. Due to this restriction, many applications have to be rewritten to
work around the issue after migrated to federated file system. Supporting
rename between different namenodes would make it much easier to migrate to
federated file systems.
We have finished a preliminary implementation of this feature in a 2.6
branch. I'll upload a write-up regarding the design in a few days. And then
I'll re-org the code against the trunk and upload the patch.
> Support rename between different NameNodes in federated HDFS
> ------------------------------------------------------------
>
> Key: HDFS-11573
> URL: https://issues.apache.org/jira/browse/HDFS-11573
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: federation
> Reporter: zhouyingchao
>
> Federated file system can improve overall scalability by dividing a
> single namespace into multiple sub-namespaces. Since the divided
> sub-namespace are held by different namenodes, rename operation between those
> sub-namespace is forbidden. Due to this restriction, many applications have
> to be rewritten to work around the issue after migrated to federated file
> system. Supporting rename between different namenodes would make it much
> easier to migrate to federated file systems.
> We have finished a preliminary implementation of this feature in a 2.6
> branch. I'll upload a write-up regarding the design in a few days. And then
> I'll re-org the code against the trunk and upload the patch.
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