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https://issues.apache.org/jira/browse/HBASE-2007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782038#action_12782038
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Lars George commented on HBASE-2007:
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Is that related to HBASE-1995? Just asking.
> handle overly large column family in one row
> --------------------------------------------
>
> Key: HBASE-2007
> URL: https://issues.apache.org/jira/browse/HBASE-2007
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: Andrew Purtell
> Fix For: 0.20.3, 0.21.0
>
>
> From a team in TM:
> {quote}
> I tried to create the large column in one row and one family. The value of
> each column has only 10 bytes. When I created the 804226850th column, the
> region server was crashed. I find that all columns of one row and one family
> will in the same region. The region server will crash, because this region is
> too large. And then I want to reboot HBase, after several minutes, the region
> servers will crash one by one.
> If one row and one family cannot split, then no matter how many machines are
> in HBase system, the capacity of HBase will be limited by one machine. I want
> to know whether this problem is a bug. If the column quantity in one row and
> one family is limited, can you tell me the safe range?
> {quote}
> Currently a row cannot be split. So an individual row can expand only to some
> finite limit constrained by the region server capability.
> I am impressed that a row was able to successfully contain 804,226,849
> columns.
> The HBase storage capability goals are currently "billions of rows, millions
> of columns, thousands of tables". A test involving hundreds of millions of
> columns is very challenging.
> Most important, HBase should not accept input beyond some limit which
> produces a cascading failure.
> I think we also do want to have the architectural discussion about rows that
> must span region servers due to immensity.
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