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https://issues.apache.org/jira/browse/HBASE-9128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730078#comment-13730078
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Enis Soztutar commented on HBASE-9128:
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bq. How would migration 'handle' it?
The problem was that, when we filter out table directories using
HConstants.HBASE_NON_USER_TABLE_DIRS, we might ignore tables named "logs",
"data" if we just change the constants. We can easily circumvent this, but hard
coding the old reserved names in the migration script, and handle filtering out
table directories from ls output for hbase.rootdir differently.
> Drop the '.' prefix from names under hbase.rootdir after namespaces goes in
> ---------------------------------------------------------------------------
>
> Key: HBASE-9128
> URL: https://issues.apache.org/jira/browse/HBASE-9128
> Project: HBase
> Issue Type: Sub-task
> Reporter: stack
> Priority: Critical
>
> Change it so instead of hbase.rootdir looking like this:
> {code}
> drwxr-xr-x 5 stack staff 170 Aug 5 14:43 .data
> -rw-r--r-- 1 stack staff 12 Aug 5 14:43 .hbase.id.crc
> -rw-r--r-- 1 stack staff 12 Aug 5 14:43 .hbase.version.crc
> drwxr-xr-x 3 stack staff 102 Aug 5 14:43 .logs
> drwxr-xr-x 2 stack staff 68 Aug 5 14:43 .oldlogs
> drwxr-xr-x 3 stack staff 102 Aug 5 14:43 .tmp
> -rwxrwxrwx 1 stack staff 42 Aug 5 14:43 hbase.id
> -rwxrwxrwx 1 stack staff 7 Aug 5 14:43 hbase.version
> {code}
> It looks like this:
> {code}
> drwxr-xr-x 5 stack staff 170 Aug 5 14:43 data
> -rw-r--r-- 1 stack staff 12 Aug 5 14:43 .hbase.id.crc
> -rw-r--r-- 1 stack staff 12 Aug 5 14:43 .hbase.version.crc
> drwxr-xr-x 3 stack staff 102 Aug 5 14:43 logs
> drwxr-xr-x 2 stack staff 68 Aug 5 14:43 oldlogs
> drwxr-xr-x 3 stack staff 102 Aug 5 14:43 tmp
> -rwxrwxrwx 1 stack staff 42 Aug 5 14:43 hbase.id
> -rwxrwxrwx 1 stack staff 7 Aug 5 14:43 hbase.version
> {code}
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