'Modifies the settings for a cluster. For example, you can add
another security or parameter group, update the preferred
maintenance window, or change the master user password.
Resetting a cluster password or modifying the security groups
associated with a cluster do not need a reboot. However,
modifying a parameter group requires a reboot for parameters
to take effect. For more information about managing clusters,
go to `Amazon Redshift Clusters`_ in the Amazon Redshift
Management Guide
You can also change node type and the number of nodes to scale
up or down the cluster. When resizing a cluster, you must
specify both the number of nodes and the node type even if one
of the parameters does not change. If you specify the same
number of nodes and node type that are already configured for
the cluster, an error is returned.
:type cluster_identifier: string
:param cluster_identifier: The unique identifier of the cluster to be
modified.
Example: `examplecluster`
:type cluster_type: string
:param cluster_type: The new cluster type.
When you submit your cluster resize request, your existing cluster goes
into a read-only mode. After Amazon Redshift provisions a new
cluster based on your resize requirements, there will be outage for
a period while the old cluster is deleted and your connection is
switched to the new cluster. You can use DescribeResize to track
the progress of the resize request.
Valid Values: ` multi-node | single-node `
:type node_type: string
:param node_type: The new node type of the cluster. If you specify a
new node type, you must also specify the number of nodes parameter
also.
When you submit your request to resize a cluster, Amazon Redshift sets
access permissions for the cluster to read-only. After Amazon
Redshift provisions a new cluster according to your resize
requirements, there will be a temporary outage while the old
cluster is deleted and your connection is switched to the new
cluster. When the new connection is complete, the original access
permissions for the cluster are restored. You can use the
DescribeResize to track the progress of the resize request.
Valid Values: ` dw1.xlarge` | `dw1.8xlarge` | `dw2.large` |
`dw2.8xlarge`.
:type number_of_nodes: integer
:param number_of_nodes: The new number of nodes of the cluster. If you
specify a new number of nodes, you must also specify the node type
parameter also.
When you submit your request to resize a cluster, Amazon Redshift sets
access permissions for the cluster to read-only. After Amazon
Redshift provisions a new cluster according to your resize
requirements, there will be a temporary outage while the old
cluster is deleted and your connection is switched to the new
cluster. When the new connection is complete, the original access
permissions for the cluster are restored. You can use
DescribeResize to track the progress of the resize request.
Valid Values: Integer greater than `0`.
:type cluster_security_groups: list
:param cluster_security_groups:
A list of cluster security groups to be authorized on this cluster.
This change is asynchronously applied as soon as possible.
Security groups currently associated with the cluster, and not in the
list of groups to apply, will be revoked from the cluster.
Constraints:
+ Must be 1 to 255 alphanumeric characters or hyphens
+ First character must be a letter
+ Cannot end with a hyphen or contain two consecutive hyphens
:type vpc_security_group_ids: list
:param vpc_security_group_ids: A list of virtual private cloud (VPC)
security groups to be associated with the cluster.
:type master_user_password: string
:param master_user_password:
The new password for the cluster master user. This change is
asynchronously applied as soon as possible. Between the time of the
request and the completion of the request, the `MasterUserPassword`
element exists in the `PendingModifiedValues` element of the
operation response.
Default: Uses existing setting.
Constraints:
+ Must be between 8 and 64 characters in length.
+ Must contain at least one uppercase letter.
+ Must contain at least one lowercase letter.
+ Must contain one number.
+ Can be any printable ASCII character (ASCII code 33 to 126) except \'
(single quote), " (double quote), \, /, @, or space.
:type cluster_parameter_group_name: string
:param cluster_parameter_group_name: The name of the cluster parameter
group to apply to this cluster. This change is applied only after
the cluster is rebooted. To reboot a cluster use RebootCluster.
Default: Uses existing setting.
Constraints: The cluster parameter group must be in the same parameter
group family that matches the cluster version.
:type automated_snapshot_retention_period: integer
:param automated_snapshot_retention_period: The number of days that
automated snapshots are retained. If the value is 0, automated
snapshots are disabled. Even if automated snapshots are disabled,
you can still create manual snapshots when you want with
CreateClusterSnapshot.
If you decrease the automated snapshot retention period from its
current value, existing automated snapshots that fall outside of
the new retention period will be immediately deleted.
Default: Uses existing setting.
Constraints: Must be a value from 0 to 35.
:type preferred_maintenance_window: string
:param preferred_maintenance_window: The weekly time range (in UTC)
during which system maintenance can occur, if necessary. If system
maintenance is necessary during the window, it may result in an
outage.
This maintenance window change is made immediately. If the new
maintenance window indicates the current time, there must be at
least 120 minutes between the current time and end of the window in
order to ensure that pending changes are applied.
Default: Uses existing setting.
Format: ddd:hh24:mi-ddd:hh24:mi, for example `wed:07:30-wed:08:00`.
Valid Days: Mon | Tue | Wed | Thu | Fri | Sat | Sun
Constraints: Must be at least 30 minutes.
:type cluster_version: string
:param cluster_version: The new version number of the Amazon Redshift
engine to upgrade to.
For major version upgrades, if a non-default cluster parameter group is
currently in use, a new cluster parameter group in the cluster
parameter group family for the new version must be specified. The
new cluster parameter group can be the default for that cluster
parameter group family. For more information about managing
parameter groups, go to `Amazon Redshift Parameter Groups`_ in the
Amazon Redshift Management Guide .
Example: `1.0`
:type allow_version_upgrade: boolean
:param allow_version_upgrade: If `True`, upgrades will be applied
automatically to the cluster during the maintenance window.
Default: `False`
:type hsm_client_certificate_identifier: string
:param hsm_client_certificate_identifier: Specifies the name of the HSM
client certificate the Amazon Redshift cluster uses to retrieve the
data encryption keys stored in an HSM.
:type hsm_configuration_identifier: string
:param hsm_configuration_identifier: Specifies the name of the HSM
configuration that contains the information the Amazon Redshift
cluster can use to retrieve and store keys in an HSM.
:type new_cluster_identifier: string
:param new_cluster_identifier: The new identifier for the cluster.
Constraints:
+ Must contain from 1 to 63 alphanumeric characters or hyphens.
+ Alphabetic characters must be lowercase.
+ First character must be a letter.
+ Cannot end with a hyphen or contain two consecutive hyphens.
+ Must be unique for all clusters within an AWS account.
Example: `examplecluster`'

def modify_cluster(self, cluster_identifier, cluster_type=None, node_type=None, number_of_nodes=None, cluster_security_groups=None, vpc_security_group_ids=None, master_user_password=None, cluster_parameter_group_name=None, automated_snapshot_retention_period=None, preferred_maintenance_window=None, cluster_version=None, allow_version_upgrade=None, hsm_client_certificate_identifier=None, hsm_configuration_identifier=None, new_cluster_identifier=None):

    params = {'ClusterIdentifier': cluster_identifier}
    if (cluster_type is not None):
        params['ClusterType'] = cluster_type
    if (node_type is not None):
        params['NodeType'] = node_type
    if (number_of_nodes is not None):
        params['NumberOfNodes'] = number_of_nodes
    if (cluster_security_groups is not None):
        self.build_list_params(params, cluster_security_groups, 'ClusterSecurityGroups.member')
    if (vpc_security_group_ids is not None):
        self.build_list_params(params, vpc_security_group_ids, 'VpcSecurityGroupIds.member')
    if (master_user_password is not None):
        params['MasterUserPassword'] = master_user_password
    if (cluster_parameter_group_name is not None):
        params['ClusterParameterGroupName'] = cluster_parameter_group_name
    if (automated_snapshot_retention_period is not None):
        params['AutomatedSnapshotRetentionPeriod'] = automated_snapshot_retention_period
    if (preferred_maintenance_window is not None):
        params['PreferredMaintenanceWindow'] = preferred_maintenance_window
    if (cluster_version is not None):
        params['ClusterVersion'] = cluster_version
    if (allow_version_upgrade is not None):
        params['AllowVersionUpgrade'] = str(allow_version_upgrade).lower()
    if (hsm_client_certificate_identifier is not None):
        params['HsmClientCertificateIdentifier'] = hsm_client_certificate_identifier
    if (hsm_configuration_identifier is not None):
        params['HsmConfigurationIdentifier'] = hsm_configuration_identifier
    if (new_cluster_identifier is not None):
        params['NewClusterIdentifier'] = new_cluster_identifier
    return self._make_request(action='ModifyCluster', verb='POST', path='/', params=params)
