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https://issues.apache.org/jira/browse/HBASE-3730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015748#comment-13015748
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Eric Charles commented on HBASE-3730:
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I've copied here after the comment made by tsuna on
http://markmail.org/message/ifphk6plab3uoi5b.
tsuna has summarized what I have in mind: it does not cost much (well, some
disk), and gives a nice feature to recover values. 3 is a good number, but
should be further announced in doc, tutorials,...
tsuna comment: "Personally I think that 3 is a good reasonable default. Maybe
most people don't really need 3 versions, but most of the time I'm sure they
can pay for it, they won't even notice. It can be a life-saver after you screw
up to be able to get back to older versions... If you truly have a "big data"
problem (few people really do), then you probably will know what you're doing,
and you'll tune the number of versions appropriately for your needs."
> DEFAULT_VERSIONS should be 1
> ----------------------------
>
> Key: HBASE-3730
> URL: https://issues.apache.org/jira/browse/HBASE-3730
> Project: HBase
> Issue Type: Improvement
> Reporter: Joe Pallas
> Priority: Minor
>
> The current DEFAULT_VERSIONS (in HColumnDescriptor) is 3, but there is no
> particular reason for this. Many uses require only 1, and having a default
> that is different makes people confused (e.g., "Do I need multiple versions
> to support deletes properly?").
> Reasonable values for the default are 1 and max int. 1 is the better choice.
> Discussion on the mailing list suggests that the current value of 3 may have
> been derived from an example in the Bigtable paper. The example does not
> suggest that there is anything special about 3, it's just an illustration.
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