hbase-shell/src/main/ruby/shell/commands/delete_table_snapshots.rb

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module Shell
  module Commands
    class DeleteTableSnapshots < Command
      def help
        <<-EOF
Delete all of the snapshots matching the given table name regular expression
and snapshot name regular expression.
By default snapshot name regular expression will delete all the snapshots of the
matching table name regular expression.

Examples:
  hbase> delete_table_snapshots 'tableName'
  hbase> delete_table_snapshots 'tableName.*'
  hbase> delete_table_snapshots 'tableName', 'snapshotName'
  hbase> delete_table_snapshots 'tableName', 'snapshotName.*'
  hbase> delete_table_snapshots 'tableName.*', 'snapshotName.*'
  hbase> delete_table_snapshots 'ns:tableName.*', 'snapshotName.*'

EOF
      end

      def command(tableNameregex, snapshotNameRegex = '.*')
        formatter.header(['SNAPSHOT', 'TABLE + CREATION TIME'])
        list = admin.list_table_snapshots(tableNameregex, snapshotNameRegex)
        count = list.size
        list.each do |snapshot|
          creation_time = Time.at(snapshot.getCreationTime / 1000).to_s
          formatter.row([snapshot.getName, snapshot.getTableNameAsString +
            ' (' + creation_time + ')'])
        end
        puts "\nDelete the above #{count} snapshots (y/n)?" unless count == 0
        answer = 'n'
        answer = gets.chomp unless count == 0
        puts "No snapshots matched the table name regular expression #{tableNameregex} and the snapshot name regular expression #{snapshotNameRegex}" if count == 0
        return unless answer =~ /y.*/i

        @start_time = Time.now
        list.each do |deleteSnapshot|
          begin
            admin.delete_snapshot(deleteSnapshot.getName)
            puts "Successfully deleted snapshot: #{deleteSnapshot.getName}"
            puts "\n"
          rescue RuntimeError
            puts "Failed to delete snapshot: #{deleteSnapshot.getName}, due to below exception,\n" + $ERROR_INFO
            puts "\n"
          end
        end
      end
    end
  end
end