[jira] Resolved: (HBASE-867) If millions of columns in a column family, hbase scanner won't come up

["Jonathan Gray (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Gray resolved HBASE-867.
---------------------------------

    Resolution: Fixed

Given that I can do the above on a smallish cluster without a problem (the only problems come from OOME when serializing these big rows if I grow value size), I am resolving this issue as fixed by HBASE-1304.

To be able to scale further as far as columns in a row, we need intra-row scanning.  I have filed HBASE-1537 currently targeted at 0.21 for now.

There are still improvements to be made when not returning all columns in a row with millions of columns.  That optimization is addressed in HBASE-1517 and slated for 0.20.1.

> 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
>            Assignee: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.20.0
>
>
> 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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