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https://issues.apache.org/jira/browse/HBASE-867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628421#action_12628421
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stack commented on HBASE-867:
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Its critical because this is canonical usage-pattern.

> If millions of columns in a column family, hbase scanner won't come up
> ----------------------------------------------------------------------
>
>                 Key: HBASE-867
>                 URL: https://issues.apache.org/jira/browse/HBASE-867
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>            Priority: Critical
>
> Our Daniel has uploaded a table that has a column family with millions of 
> columns in it.  He can get items from the table promptly specifying row and 
> column.  Scanning is another matter.  Thread dumping I see we're stuck in the 
> scanner constructor nexting through cells.

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