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HBASE-12049 Help for alter command is a bit confusing (Ashish Singhi)

This commit is contained in:
Misty Stanley-Jones 2014-10-01 16:23:48 +10:00
parent 456e9fa7a7
commit 231bc98761
1 changed files with 11 additions and 6 deletions
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17
hbase-shell/src/main/ruby/shell/commands/alter.rb
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@ -22,12 +22,17 @@ module Shell
class Alter < Command
def help
return <<-EOF
Alter a table. Depending on the HBase setting ("hbase.online.schema.update.enable"),
the table must be disabled or not to be altered (see help 'disable').
You can add/modify/delete column families, as well as change table
configuration. Column families work similarly to create; column family
spec can either be a name string, or a dictionary with NAME attribute.
Dictionaries are described on the main help command output.
Alter a table. If the "hbase.online.schema.update.enable" property is set to
false, then the table must be disabled (see help 'disable'). If the
"hbase.online.schema.update.enable" property is set to true, tables can be
altered without disabling them first. Altering enabled tables has caused problems
in the past, so use caution and test it before using in production.
You can use the alter command to add,
modify or delete column families or change table configuration options.
Column families work in a similar way as the 'create' command. The column family
specification can either be a name string, or a dictionary with the NAME attribute.
Dictionaries are described in the output of the 'help' command, with no arguments.
For example, to change or add the 'f1' column family in table 't1' from
current value to keep a maximum of 5 cell VERSIONS, do: