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https://issues.apache.org/jira/browse/HADOOP-15891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhenzhao wang updated HADOOP-15891:
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Attachment: HDFS-13948.011.patch
> Provide Regex Based Mount Point In Inode Tree
> ---------------------------------------------
>
> Key: HADOOP-15891
> URL: https://issues.apache.org/jira/browse/HADOOP-15891
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Reporter: zhenzhao wang
> Assignee: zhenzhao wang
> Priority: Major
> Attachments: HDFS-13948.001.patch, HDFS-13948.002.patch,
> HDFS-13948.003.patch, HDFS-13948.004.patch, HDFS-13948.005.patch,
> HDFS-13948.006.patch, HDFS-13948.007.patch, HDFS-13948.008.patch,
> HDFS-13948.009.patch, HDFS-13948.011.patch, HDFS-13948_ Regex Link Type In
> Mont Table-V0.pdf, HDFS-13948_ Regex Link Type In Mount Table-v1.pdf
>
>
> This jira is created to support regex based mount point in Inode Tree. We
> noticed that mount point only support fixed target path. However, we might
> have user cases when target needs to refer some fields from source. e.g. We
> might want a mapping of /cluster1/user1 => /cluster1-dc1/user-nn-user1, we
> want to refer `cluster` and `user` field in source to construct target. It's
> impossible to archive this with current link type. Though we could set
> one-to-one mapping, the mount table would become bloated if we have thousands
> of users. Besides, a regex mapping would empower us more flexibility. So we
> are going to build a regex based mount point which target could refer groups
> from src regex mapping.
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