This code takes a snapshot of all HBase tables, using the snapshot command (No file copies are performed). Tested on CDH-5.4.4-1

HBaseBackup.rb

# Checking if the hbase.snapshot.enabled property in hbase-site.xml is set to true
# To execute script launch this command on shell: hbase shell HBaseBackup.rb

@clusterToSave = "hdfs:///srv2:8082/hbase"
# CHECK THE PATH OF HBase lib
@libjars = `ls /opt/cloudera/parcels/CDH-5.4.4-1.cdh5.4.4.p0.4/lib/hbase/*.jar | tr "\n" ","`
@ignore = [ /zipkin\..*/i, /.*_temp/i, /.*tmp/i, /test_.*/i, /.*_test/i, /.*_old/i ]
@mappers = "2"

include Java

java_import org.apache.hadoop.hbase.HBaseConfiguration
java_import org.apache.hadoop.hbase.client.HBaseAdmin
java_import org.apache.hadoop.hbase.snapshot.ExportSnapshot
java_import org.apache.hadoop.util.ToolRunner

@conf = org.apache.hadoop.hbase.HBaseConfiguration.create

@admin = org.apache.hadoop.hbase.client.HBaseAdmin.new(@conf)

def cleanup()
    old_snapshots = @admin.listSnapshots(".*-BACKUP-.*").to_a
    old_snapshots.each { |s|
        puts "-----> Cleaning up old snapshot " + s.name
        @admin.deleteSnapshot(s.name.to_java_bytes)
    }
end

def tables_to_backup()
    to_backup = Array.new
    tables = @admin.listTables(".*").to_a
    tables.each { |s|
        tn = s.getTableName().getNameAsString().to_s
        backup = true
        @ignore.each { |i|
            if i.match(tn)
                backup = false
            end
        }
        if backup
            to_backup << tn
        end
    }
    to_backup
end

def backup(table)

    snapshot_name = table + "-BACKUP-" + Time.now.strftime("%Y%m%d_%H%M%S")

    puts "-----> Creating snapshot " + snapshot_name
    @admin.snapshot(snapshot_name.to_java_bytes, table.to_java_bytes)

    ##
    # The ExportSnapshot tool copies all the data related to a snapshot (hfiles, logs, snapshot metadata) to another cluster.
    # The tool executes a Map-Reduce job, similar to distcp, to copy files between the two clusters, 
    # and since it works at file-system level the hbase cluster does not have to be online.

    #puts "-----> Export snapshot " + snapshot_name
    #@es = org.apache.hadoop.hbase.snapshot.ExportSnapshot.new
    #args = ["--libjars", @libjars, "-snapshot", snapshot_name, "-copy-to", @clusterToSave, "-mappers", @mappers]
    #java_args = args.to_java :String
    #ToolRunner.run(@conf, @es, java_args)

    #puts "-----> Deleting snapshot " + snapshot_name
    #@admin.deleteSnapshot(snapshot_name.to_java_bytes)
end

cleanup()

tables = tables_to_backup()
puts "-----> Tables to backup"
puts tables

puts "-----> Starting backup"

tables.each { |t|
    backup(t)
}

puts "-----> Done"

exit 0