# Buggy code
def update_record(
    name,
    value,
    zone,
    record_type,
    identifier=None,
    ttl=None,
    region=None,
    key=None,
    keyid=None,
    profile=None,
    wait_for_sync=True,
    split_dns=False,
    private_zone=False,
    retry_on_rate_limit=True,
    rate_limit_retries=5,
):
    """
    Modify a record in a zone.

    CLI example::

        salt myminion boto_route53.modify_record test.example.org 1.1.1.1 example.org A
    """
    if region is None:
        region = "universal"

    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)

    if split_dns:
        _zone = _get_split_zone(zone, conn, private_zone)
    else:
        _zone = conn.get_zone(zone)
    if not _zone:
        msg = "Failed to retrieve zone {0}".format(zone)
        log.error(msg)
        return False
    _type = record_type.upper()

    _value = _munge_value(value, _type)
    while rate_limit_retries > 0:
        try:
            if _type == "A":
                status = _zone.update_a(name, _value, ttl, identifier)
                return _wait_for_sync(status.id, conn, wait_for_sync)
            elif _type == "CNAME":
                status = _zone.update_cname(name, _value, ttl, identifier)
                return _wait_for_sync(status.id, conn, wait_for_sync)
            elif _type == "MX":
                status = _zone.update_mx(name, _value, ttl, identifier)
                return _wait_for_sync(status.id, conn, wait_for_sync)
            else:
                old_record = _zone.find_records(name, _type)
                if not old_record:
                    return False
                status = _zone.update_record(old_record, _value, ttl, identifier)
                return _wait_for_sync(status.id, conn, wait_for_sync)

        except DNSServerError as e:
            # if rate limit, retry:
            if retry_on_rate_limit and "Throttling" == e.code:
                log.debug("Throttled by AWS API.")
                time.sleep(2)
                rate_limit_retries -= 1
                continue  # the while True; try again if not out of retries
            raise e


# Traceback (KeyError)
----------
ID: private-dns-name-CNAME-record
Function: boto_route53.present
Name: sara-salt.xxxx.com.
Result: False
Comment: An exception occurred in this state: Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/salt/state.py", line 1624, in call
**cdata['kwargs'])
File "/usr/lib/python2.7/dist-packages/salt/loader.py", line 1491, in wrapper
return f(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/salt/states/boto_route53.py", line 197, in present
if identifier and identifier != record['identifier']:
KeyError: 'identifier'
Started: 16:03:24.972572
Duration: 86.23 ms
Changes:

# Fixed code
def update_record(
    name,
    value,
    zone,
    record_type,
    identifier=None,
    ttl=None,
    region=None,
    key=None,
    keyid=None,
    profile=None,
    wait_for_sync=True,
    split_dns=False,
    private_zone=False,
    retry_on_rate_limit=True,
    rate_limit_retries=5,
):
    """
    Modify a record in a zone.

    CLI example::

        salt myminion boto_route53.modify_record test.example.org 1.1.1.1 example.org A
    """
    if region is None:
        region = "universal"

    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)

    if split_dns:
        _zone = _get_split_zone(zone, conn, private_zone)
    else:
        _zone = conn.get_zone(zone)
    if not _zone:
        msg = "Failed to retrieve zone {0}".format(zone)
        log.error(msg)
        return False
    _type = record_type.upper()

    _value = _munge_value(value, _type)
    while rate_limit_retries > 0:
        try:
            old_record = _zone.find_records(name, _type, identifier=identifier)
            if not old_record:
                return False
            status = _zone.update_record(old_record, _value, ttl, identifier)
            return _wait_for_sync(status.id, conn, wait_for_sync)

        except DNSServerError as e:
            # if rate limit, retry:
            if retry_on_rate_limit and "Throttling" == e.code:
                log.debug("Throttled by AWS API.")
                time.sleep(2)
                rate_limit_retries -= 1
                continue  # the while True; try again if not out of retries
            raise e